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Tujuan: Mengetahui hubungan status hidrasi dan intensitas latihan terhadap VO 2 Max pada atlet basket Fakultas Kedokteran Universitas Tanjungpura. Metode: Penelitian ini menggunakan metode observasional analitik dengan pendekatan cross sectional . Subjek dari penelitian ini berjumlah 15 atlet Fakultas Kedokteran Universitas Tanjungpura yang sesuai dengan kriteria inklusi. Pada penelitian ini dilakukan pengumpulan identitas responden, frekuensi latihan, durasi latihan, pengukuran berat badan berdasarkan kriteria dari National Athletic Trainers' Association , pengukuran tinggi badan, pengukuran VO 2 Max menggunakan metode rockport jogging1,6 km dan diberikan kuesioner skala Borg RPE. Hasil: sebanyak 8 orang (53,3%) mengalami dehidrasi ringan, intensitas latihan ringan 9 orang (60%), dan 8 orang (53,3%) dengan VO 2 Max kurang. Hasil uji korelasi spearman antara status hidrasi terhadap tingkat VO 2 Max menunjukkan nilai signifikansi sebesar 0,036 dan angka koefisien korelasi sebesar 0,545 yang menunjukkan terdapat korelasi positif dengan korelasi kuat. Kemudian antara intensitas latihan terhadap tingkat VO 2 Max menunjukkan nilai signifikansi 0,248 yang menunjukkan tidak terdapat korelasi. Kesimpulan: Terdapat hubungan searah antara tingkat status hidrasi terhadap VO 2Max dan tidak terdapat hubungan antara intensitas latihan terhadap VO 2 Max pada keranjang atlet Fakultas Kedokteran Universitas Tanjungpura.

Abstract Background High-intensity interval running exercise (HIIE) is emerging as a time-efficient exercise modality for improving body composition and fitness in comparison with moderate-intensity continuous aerobic exercise (MICE); however, existing evidence is still unclear in children with overweight and thus we compared the effects of HIIE and MICE on body composition, muscular, and cardiorespiratory fitness in children with overweight. Methods In this randomized study, 40 male children with overweight aged 7–10 years were divided into an 8-week exercise regime: (1) HIIE group [n = 20; 2 sets of 15 × 20s at 85–95% maximal aerobic speed (MAS) separated by 15 × 20s recovery at 50% MAS, 3 days per week] and (2) MICE group [n = 20; 30 min at 60–70% MAS, 3 days per week]. Body composition, muscular and cardiorespiratory fitness were assessed before and after the 8-week intervention at similar times and conditions of the day. Results Following the 8-week HIIE protocol, weight, BMI, and fat mass decreased significantly (weight: − 1.4% vs. 0.2%, p 0.05). Conclusion Our findings suggested that school-based HIIE intervention was highly in improving body composition and cardiorespiratory fitness of children with overweight than the MICE regime; however, MICE still provided improvements over time that were just not to the same magnitude of HIIE.

In 2020, the World Health Organization (WHO) recommended engaging in 150-300 minutes of moderate-intensity physical activity per week, at 40-60% of the Maximal Pulse Rate (HRM), or 75-150 minutes of high-intensity physical activity at 60-85% HRM to maintain and enhance adult fitness. However, commonly cited obstacles to physical activity include time constraints, low motivation, and difficulties in adhering to guidelines. High-Intensity Interval Training (HIIT), requiring less time for exercise, has been shown to deliver equivalent or greater health benefits compared to WHO recommendations. This study aims to assess the impact of HIIT on physical fitness, VO2Max, and social status. Utilizing a literature review method, articles were sourced from Electronic Databases such as PubMed, ScienceDirect, and ProQuest. The results indicate that High-Intensity Interval Training (HIIT) can efficiently enhance physical fitness, significantly impact social status, and do so within a shorter time frame. This makes HIIT an appealing alternative for individuals facing challenges like time constraints, low motivation, or difficulties in adhering to traditional activity guidelines. With improvements observed in physical fitness and VO2Max, HIIT emerges as a compelling option for those seeking a time-efficient yet effective exercise method. Consequently, this research highlights that HIIT not only serves as an efficient strategy for achieving physical fitness and cardiorespiratory health but also contributes to enhancing social aspects. These findings offer valuable insights for designing more acceptable and sustainable physical activity programs within the community.

Background: Non-exercise estimated cardiorespiratory fitness (NEE-CRF) has been shown to be associated with mortality, although its association with cancer incidence is unknown. The study aimed to assess the prospective association between NEE-CRF and cancer incidence in a large cohort of men and women. Methods: The National Institutes of Health-American Association of Retired Persons diet and health study is a prospective cohort that included 402,548 participants aged 50–71 years who were free from cancer at baseline (1995–1996) (men (n = 238,835) and women (n = 163,713)) and were followed until December 31, 2015. The exposure variable was NEE-CRF expressed in metabolic equivalents. NEE-CRF was estimated using a validated equation of self-reported predictors on demographics and lifestyle behaviors derived from baseline questionnaires. Primary outcomes were total cancer incidence and incidence of prostate, breast, lung, and colorectal cancers. Cox proportional hazards models were analyzed for the association between NEE-CRF and cancer incidence outcomes adjusted for established cancer risk factors. Results: During 13.7 ± 3.2 years of follow-up (mean ± SD), 64,344 men and 31,315 women developed a new cancer. For every 1-metabolic equivalent higher NEE-CRF, the hazard ratios and 95% confidence intervals (95%CIs) were 0.96 (95%CI: 0.94–0.97) and 0.88 (95%CI: 0.84–0.92) of total and colorectal cancer incidence among men, and 0.95 (95%CI: 0.93–0.97) and 0.94 (95%CI: 0.91–0.97) of total and breast cancer incidence among women, respectively (all p < 0.001). NEE-CRF was not associated with incidence of prostate and lung cancers in men or colorectal and lung cancers in women. Conclusion: These results suggest that higher CRF levels, as assessed by the applied non-exercise estimated method, may provide preventive benefits against the development of cancer, while low CRF could potentially serve as a modifiable cancer risk factor. Integrating NEE-CRF into screening paradigms and referring low-fit individuals to improve CRF could complement the public health prevention strategy against cancer.

Kualitas sistem organ tubuh meningkat melalui proses yang sistematis, ini bertujuan untuk meningkatkan kebugaran jasmani. WHO menyatakan dalam Global Recommendations on Physical Activity for Health, bahwa ada efek yang menguntungkan dan konsisten dari kapasitas fisik dalam mempertahankan berat badan. Dengan VO2Max yang baik maka seseorang mampu dengan maksimal menerima dan menjalankan program latihan sesuai dengan kapasitas fisik. Tujuan: penelitian bertujuan untuk mengetahui gambaran IMT, Vo2max, dan kapasitas fisik pada 56 mahasiswa baru prodi Fisioterapi angkatan 2022 Universitas Hasanuddin Pasca Pembelajaran Online. Metode: menggunakan metode penelitian analitik deskriptif dengan pendekatan cross sectional. Hasil penelitian: 56 mahasiswa dilakukan pengukuran terhadap nilai IMT, Vo2Max, serta kapasitas fisik (pull up, push up, sit up) didapatkan hasil berupa nilai sempurna untuk pull up (14,4%), push up (14,3%), sit up (16,1%) dengan kategori IMT normal. Sedangkan untuk kapasitas fisik sempurna untuk push up (7,1%), sit up (1,8%), pull up (7,1%) dengan kategori nilai Vo2Max bagus. Kesimpulan: secara umum indeks massa tubuh, Vo2Max dan kapasitas fisik pada mahasiswa fisioterapi angkatan 2022, menunjukan bahwa responden yang memiliki indeks massa tubuh dengan hasil obesitas dan gemuk sulit untuk melakukan kegiatan kapasitas fisik. Data Vo2Max yang didapatkan dari latihan yang dilakukan hanya pus up yang memiliki hasil yang sempurna.

Background and Study Aim. To choose the ideal training or performance times, it is crucial to assess VO2 max performance across different time-of-day particular chronotypes. This study aimed to investigate the differences in VO2 max between the chronotype of university students during the morning and evening time of the day. Material and Methods. Fifty-two university students (26 morning type and 26 evening type) with mean age 23.05± 2.07 years, weight 66.71±4.31Kg and height of 170.90±5.18 cm and BMI of 22.75±1.91kg/m2 were recruited based on the results of the Horne-Ostberg Morningness- Eveningness Questionnaire (MEQs) participated in this Cross-over study. VO2 max was measured directly by gas collected using mouth tube breath to breath through the use of the gas analyzer the AD instrument (model-ML206) with an incremental graded maximal exercise test done on the treadmill. Results. The morning type group's VO2 max was significantly better in the morning hour than it was in the evening (p=.013), and when the VO2 max of the evening type group was measured in the morning and evening hours and compared, there was a statistically significant difference in favour of the evening hours (p=.004). Additionally, there is no discernible difference between the VO2 max of the morning type and the evening type group either in the morning hours or the evening hours, but trends indicate that the morning type group has a higher VO2max in the morning hour and the same is true for the evening type group in the evening hour. Conclusion. The findings of this study showed an interaction between chronotype and time of the day in VO2 max. For endurance training, trainers should consider the individual's chronotype and time of the day for exercise prescription.

The aim of this systematic review was twofold: to identify the main trends and issues that are being addressed by researchers in the context of physical fitness and sports performance in deaf and hard-of-hearing (D/HH) athletes and to indicate the needs and future directions that should be implemented in the training process of athletes with hearing impairments. The methodology of this systematic review was planned according to PRISMA guidelines. A search of electronic databases (PubMed, EBSCO, Scopus) was conducted to identify all studies on physical fitness, sports performance and participation, and D/HH athletes from 2003 to 2024. In total, 87 full-text articles were assessed to determine eligibility, while 34 studies met the inclusion criteria and were subjected to detailed analysis and assessment of their methodological quality. The presented systematic review indicates evidence that D/HH athletes are characterized by a similar or higher level in selected motor abilities compared to hearing athletes. Moreover, it seems that hearing impairment is not a barrier in the development of an athlete’s physical fitness, including aerobic capacity, muscular strength and power or speed of reaction. Furthermore, inclusion in sports participation and specific tools (i.e., communication aids) appear to be crucial factors for performance enhancement.

This review investigates the effect of two different concurrent training sequences on endurance performance. The sequences investigated are Endurance–Resistance (ER) and Resistance–Endurance (RE). A literature search is conducted of the SPORTDiscus and Medline databases. The included studies are randomized control trials, which compare the effect of ER and RE on at least one endurance performance variable. A PEDro scale is used to assess the methodological quality of the articles in this review. Of a total of 152 articles identified during the initial screening, 15 studies meet the inclusion criteria. These studies include 426 participants (298 males and 128 females), with 212 of the participants training with ER and 214 with RE. The results are presented as the percentage change of the mean from pre- to post-test. All the studies show an improvement in endurance from pre to post for both interventions, except for the RE group in one study. This review finds small and non-conclusive sequence effects between ER and RE, suggesting that the sequence of concurrent training is not of great importance in relation to endurance performance.

Purpose: This study investigated the impact of four weeks of age-dependent detraining on army soldiers’ cardiorespiratory fitness and maximal and explosive strength. Methods: Fourteen volunteer tactical athletes participated, divided into two age groups (20 to 29 and 30 to 40 years). Before and after the detraining period, we assessed their anthropometric measurements (weight, height, body mass index, fat mass, and fat-free mass), cardiorespiratory fitness (maximal oxygen uptake [VO2max] and ventilatory thresholds [VT1 and VT2]), and kinematic properties during a single-leg counter-moving jump (CMJ) test for both the dominant and non-dominant legs. Two-way ANOVA followed by the Holm–Sidak post hoc test was used. Results: The anthropometric and cardiovascular variables did not show significant differences between the groups. However, both groups exhibited a significantly reduced maximum time and speed at the VO2max. Furthermore, the flight time and maximum height during the CMJ significantly decreased in the non-dominant leg for both age groups. Notably, the dominant leg’s concentric impulse (CI) significantly reduced during the CMJ, but this effect was observed only in the 30–40 age group. There were significant differences between the two age groups. Conclusions: Our findings suggest that four weeks of detraining negatively impacts aerobic fitness and muscular strength, independently of age. However, the dominant leg may be more susceptible to detraining effects in army soldiers aged 30–40. Furthermore, as a perspective, our results strongly suggest that a detraining period could affect successful missions (aerobic performance deterioration), as well as promote a muscle imbalance between the legs, which could encourage muscle injuries and endanger combat missions.

Insufficient physical activity (PA) is associated with low cardiorespiratory fitness, which favors cardiovascular and other noncommunicable diseases. Additionally, it evidentially affects mental health. Considering the WHO PA guidelines, CrossFit® represents a versatile exercise program that combines aerobic and resistance training with mobility and could help reduce disease incidences among sedentary people. Yet, long-term CrossFit research is sparse. We conducted a nine-month intervention (≥2 CrossFit workouts/week) in 16 beginners (14 males, 35 ± 6.8 years, 180 ± 8.6 cm, 85. 5 ± 19.1 kg). As a primary endpoint, VO2max was assessed at baseline, four, and nine months. A repeated-measures ANOVA and Pearson correlation were conducted. Well-being was investigated by the WHO-5 Index pre- and post-intervention. For exploratory purposes, body composition and heart rate recovery (HRR) were tracked. In a second step, all males were categorized into two groups based on body fat percentage and analyzed by repeated measures ANOVA again. The main outcome was an 11.5% VO2max improvement with a large effect (p < 0.01, ηp2 = 0.27). Strong negative correlations between baseline VO2max and its progression after nine months (p = 0.006, r = −0.654) were found. Well-being increased by 8.7% (p = 0.024, d = 0.51). HRR improved both at 1 min (p < 0.05, ηp2 = 0.34) and at 5 min (p < 0.05, ηp2 = 0.27) post-exercise. Resting metabolic rate increased by 2.2% (p = 0.042). Analysis by group revealed improved HRR at 1 min (p < 0.05, ηp2 = 0.62) only for the “high body fat” group. This study reveals the potential of CrossFit to enhance physiological and psychological health in beginners. For more robust results, larger sample sizes with a higher proportion of women are needed.

The participation of individuals with special needs in performance sports has been increasing from past to present. As in athletes with normal development, stages are planned and implemented in accordance with the goals of high-level performance sports. This study aims to determine the functional threshold power (FTP), VO2max and anaerobic threshold values of a cyclist with special needs to create performance prediction for athletes in similar disability groups. Fırat Uğur, a 26-year-old athlete with special needs who has been participating in cycling competitions for three years and has a body weight of 68 kg and a height of 180.5 cm, participated in the current study. In the findings obtained from the study, the normalized power value of the athlete was found as 204.3 watts, the FTP value as 204.3 watts and the relative power value as 3.00 watts / kg. The athlete's VO2max value was 48.3 ml/kg/min; VO2max load was 298 watts, and VO2max heart rate was 175 beats/min, anaerobic threshold VO2 value was 24.7 ml/kg/min, anaerobic threshold load was 103 watts and anaerobic threshold heart rate was 127 beats/min. When the research findings of the cyclists with special needs were compared with the results obtained from the current study, Fırat Uğur's findings were at lower levels. Considering that the athlete has only participated in competitions as a performance athlete for three years, it can be predicted that he will increase his performance level in the following years. It is recommended that the athlete's training be prepared according to the findings obtained and that the performance development be followed with measurements to be made at regular intervals.

This study aimed to determine: (1) the effect of circuit and interval training methods on agility and VO₂max; (2) the difference in the effect of high leg muscle endurance and low leg muscle endurance on agility and VO₂max; (3) the interaction between circuit training, interval training and leg muscle endurance (high and low) on agility and VO₂max. Materials and methods. This research is an experiment with a 2x2 factorial design. In this study, the number of samples used was 20 players selected by purposive sampling. Agility was measured with the Illinois agility test instrument, VO₂max was measured with a multistage fitness test, and leg muscle endurance was measured with a wall sit test. Data analysis used a two-way ANOVA test with a significance level of α < 0.05. Results. The results of this study are as follows: (1) there is no difference in the effect of the circuit and interval training methods on the agility of football players, there are significant differences between the circuit and interval training methods in their effect on the VO₂max of football players; (2) there is a difference between high and low leg muscle endurance for agility and VO₂max, α < 0.05; (3) there is an interaction between the circuit, interval training, and leg muscle endurance (high and low) on agility, α < 0.05. Conclusions. There is an interaction between circuit training, interval training, and leg muscle endurance (high and low) on the agility of Porprov soccer players in Pati Regency. Meanwhile, there was no interaction between circuit training, interval training, and leg muscle endurance (high and low) on the VO₂max of Porprov football players in Pati Regency.

Abstract Background There is limited information regarding adaptation of HIIT in female athletes which is important since the adaptation to HIIT may be different compared to male athletes. Therefore, the aim of this systematic review was to summarize the effects of HIIT on physical performance in female team sports athletes. Methods The following databases Google Scholar, PubMed, Web of Science, Cochrane Library, ProQuest and Science Direct were searched prior to September 2nd, 2022. The inclusion criteria were longitudinal studies written in English, elite, sub-elite or college female team sports participants, and HIIT intensity had to be at 80–100% maximal heart rate. There were no exclusion criteria regarding the age of the participants or their training experience. The primary outcome measures were maximal oxygen uptake (VO2max), repeated sprint ability (RSA), change of direction speed, speed, explosive strength and body composition. Results A total of 13 studies met the inclusion criteria, with a total of 230 participants. HIIT improved VO2max in five studies (ES from 0.19 to 1.08), while three studies showed improvement in their RSA (ES from 0.32 to 0.64). In addition, change of direction speed was improved in five studies (ES from 0.34 to 0.88), while speed improved in four studies (ES from 0.12 to 0.88). Explosive strength results varied (ES from 0.39 to 1.05), while in terms of body composition, the results were inconsistent through observed team sports. Conclusion HIIT has significant effects on VO2max, RSA, change of direction speed, speed and explosive strength in female team sports, regardless of the competition level.

The purpose of this study was to determine the physical condition of each futsal player at SMA Negeri 1 Gorontalo; this was to provide an overview to the coach regarding the physical condition of each individual. This research method uses a descriptive method to reveal facts in the field; the sample of this study consisted of 33 futsal players at SMA Negeri 1 Gorontalo. The results of this study are from 33 futsal players who have been tested and measured. All players fall into the category of lacking in VO2Max conditions, strength, speed and reaction speed. This study concludes that the tests and measurements gave the coach a basic picture of the player's physical condition. Hence, the coach needs to be careful in choosing and sorting out training programs to improve the physical condition of futsal players.

This study aims to find out information about the effect of circuit training on physical condition. This research is a pre-experimental study conducted using a one group pre test-post test design. Experimental research is a way to look for a causal relationship (causal relationship) between two factors that are intentionally caused by researchers by reducing other disturbing factors. The number of samples is 17 people obtained from the total sampling technique. The study was conducted for 6 weeks, with 3 meetings each week. The instrument used to measure physical condition was the VO2Max test (Bleep test). The results of data analysis using the t test showed a significant increase in the ability of physical conditions due to the influence of circuit training exercises with (t-count 18.59 > t-table 1.74). Based on the data analysis, it is known that t-count> t-table, it can be concluded that circuit training exercises affect the ability of physical conditions.

Physical inactivity and a decline in cardiorespiratory fitness (CRF) are well-known risk factors for cardiovascular disease. Furthermore, evidence suggests a correlation between obesity and diminished CRF level. However, the influence of physical activity (PA) on the CRF level of obese young adults remains unclear. The aim of this study is to compare the performance of the six-minute walk test (6MWT) in physically active and inactive obese young adults aged 18-25 years. Fifty-six participants were included and classified into two groups based on their level of PA, assessed using the Global Physical Activity Questionnaire (GPAQ). These groups consisted of physically active obese participants (PAO; n = 28) and physically inactive obese participants (PIO; n = 28). All participants underwent a 6MWT, during which baseline demographic, anthropometric, dyspnea, and clinical data were recorded. Following the 6MWT, clinical data and the 6-min walking distance (6MWD) were evaluated, and the estimated maximal oxygen consumption (VO2max) was subsequently calculated. The findings indicated that following the 6MWT, there were no statistically significant differences between the groups in terms of heart rate, systolic blood pressure, diastolic blood pressure, oxygen saturation and dyspnea (all p > 0.05). Nevertheless, the PAO group exhibited a greater 6MWD and VO2max compared to the PIO group (p < 0.05). The results suggest that physically active obese young adults have a greater 6MWD and VO2max compared to their inactive counterparts. This implies that consistent PA could provide cardiovascular fitness benefits for obese individuals.

The aim of this research was to examine the VO2 Max abilities of Rekita VC Club volleyball athletes in Koto Gasib, Kabupaten Siak. Based on the results of observations made on Rekita VC Club volleyball athletes in Koto Gasib, Kabupaten Siak, it was found that several problems arose, on average the athletes had unstable endurance when playing volleyball. This situation is influenced by a lack of time for physical training and a lack of seriousness when doing physical training and being too focused on having fun matches or sparring partners between clubs. Seeing the progress during their training, some athletes have unstable endurance and are less diligent in carrying out physical training so that the athlete's physical condition is still not perfect. The test used in this research was the bleep test to see VO2 Max abilities . The sample in this study was 11 people. From the results of tests carried out on Rekita VC Club volleyball athletes in Koto Gasib, Kabupaten Siak, results were obtained in the " Good " category.

We examined if carbohydrate (CHO) mouth rinse may reduce central fatigue and perceived exertion, thus improving maximal incremental test (MIT) performance. Nine recreational cyclists warmed up for 6 min before rinsing a carbohydrate (CHO) or placebo (PLA) solution in their mouth for 10 s in a double-blind, counterbalanced manner. Thereafter, they performed the MIT (25 W·min−1 increases until exhaustion) while cardiopulmonary and ratings of perceived exertion (RPE) responses were obtained. Pre- to post-MIT alterations in voluntary activation (VA) and peak twitch torque (Tw) were determined. Time-to-exhaustion (p = 0.24), peak power output (PPO; p = 0.45), and V̇O2MAX (p = 0.60) were comparable between conditions. Neither treatment main effect nor time–treatment interaction effect were observed in the first and second ventilatory threshold when expressed as absolute or relative V̇O2 (p = 0.78 and p = 0.96, respectively) and power output (p = 0.28 and p = 0.45, respectively) values, although with moderate-to-large effect sizes. RPE increased similarly throughout the tests and was comparable at the ventilatory thresholds (p = 0.56). Despite the time main effect revealing an MIT-induced central and peripheral fatigue as indicated by the reduced VA and Tw, CHO mouth rinse was ineffective in attenuating both fatigues. Hence, rinsing the mouth with CHO was ineffective in reducing central fatigue, lowering RPE, and improving MIT performance expressed as PPO and time-to-exhaustion. However, moderate-to-large effect sizes in power output values at VT1 and VT2 may suggest some beneficial CHO mouth rinse effects on these MIT outcomes.

The underrepresentation of the female population in exercise sciences could be attributed, at least in part, to difficulty in appropriately accounting for the effects of the menstrual cycle (MC). Previous studies examining the effects of the MC on aerobic performance and subjective measures of aerobic performance show conflicting results.Purpose: The study examined how the MC affects the objective and subjective measures of aerobic performance within untrained female participants and in comparison with untrained male participants assessed at similar time intervals.Methods: Twenty-one participants (12 females and 9 males) completed a graded exercise test (GXT) on a cycle ergometer. The female participants were tested during their early follicular (EF; menses), ovulatory (O), and mid-luteal (ML) phases of the MC. The male participants were included as the control group and were randomly assigned to a menstrual cycle phase for each visit. During GXT, maximal oxygen consumption (VO2max), respiratory exchange ratio (RER), maximal heart rate (HRmax), peak blood lactate, and rating of perceived exertion (RPE) were determined. Twenty-four hours post-exercise, the perceived recovery status (PRS) was assessed. The MC phase was estimated using basal body temperature (BBT) in the female participants.Results: The male participants obtained a higher peak power and VO2max compared to the female participants (p < 0.05). All objective measures of aerobic performance did not significantly differ across the MC phases or time points that were tested. In the untrained female participants, an effect of the MC phase on RPE was found, with RPE being higher at EF (8.92 ± 0.79) compared to O (7.67 ± 1.23; p < 0.05) and ML (7.75 ± 1.06; p < 0.05). In addition, an effect of the MC phase on PRS was found, with perceived recovery being lower at EF (6.83 ± 0.94) compared to O (8.83 ± 1.12) and ML (8.67 ± 0.65; all p < 0.005) for the untrained female participants. No significant differences in RPE and PRS were found between tests in the untrained male participants. The female participants had lower perceived recovery following EF (6.83 ± 0.94) compared with the male participants (9.00 ± 1.00; p < 0.001).Conclusion: The untrained female participants perceived greater exertion during GXT and impaired recovery following GXT in EF compared to O and ML. These results may be attributed to either a drop in female sex hormone concentrations or discomfort associated with menses. The male participants did not exhibit any changes over time. Future studies using subjective parameters such as perceived exertion to track the internal load of training in the naturally menstruating female population should consider menses.

IntroductionThe present study investigated the role of training intensity in the dose–response relationship between endurance training and cardiorespiratory fitness (CRF). The hypothesis was that beginners would benefit from an increase in training intensity after an initial training phase, even if the energy expenditure was not altered. For this purpose, 26 weeks of continuous moderate training (control group, CON) was compared to training with gradually increasing intensity (intervention group, INC) but constant energy expenditure.MethodsThirty-one healthy, untrained subjects (13 men, 18 women; 46 ± 8 years; body mass index 25.4 ± 3.3 kg m−2; maximum oxygen uptake, VO2max 34 ± 4 ml min−1 kg−1) trained for 10 weeks with moderate intensity [3 days/week for 50 min/session at 55% heart rate reserve (HRreserve)] before allocation to one of two groups. A minimization technique was used to ensure homogeneous groups. While group CON continued with moderate intensity for 16 weeks, the INC group trained at 70% HRreserve for 8 weeks and thereafter participated in a 4 × 4 training program (high-intensity interval training, HIIT) for 8 weeks. Constant energy expenditure was ensured by indirect calorimetry and corresponding adjustment of the training volume. Treadmill tests were performed at baseline and after 10, 18, and 26 weeks.ResultsThe INC group showed improved VO2max (3.4 ± 2.7 ml kg−1 min−1) to a significantly greater degree than the CON group (0.4 ± 2.9 ml kg−1 min−1) (P = 0.020). In addition, the INC group exhibited improved Vmax (1.7 ± 0.7 km h−1) to a significantly greater degree than the CON group (1.0 ± 0.5 km h−1) (P = 0.001). The reduction of resting HR was significantly larger in the INC group (7 ± 4 bpm) than in the CON group (2 ± 6 bpm) (P = 0.001). The mean heart rate in the submaximal exercise test was reduced significantly in the CON group (5 ± 6 bpm; P = 0.007) and in the INC group (8 ± 7 bpm; P = 0.001), without a significant interaction between group and time point.ConclusionIncreasing intensity leads to greater adaptations in CRF than continuing with moderate intensity, even without increased energy expenditure. After 26 weeks of training in the moderate- and higher-intensity domain, energy-matched HIIT elicited further adaptations in cardiorespiratory fitness. Thus, training intensity plays a crucial role in the dose–response relationship between endurance training and fitness in untrained but healthy individuals. Clinical Trial Registrationhttps://www.drks.de/DRKS00031445, identifier DRKS00031445.

Insufficient physical activity (PA) is associated with low cardiorespiratory fitness, which favors cardiovascular and other noncommunicable diseases. Additionally, it evidentially affects mental health. Considering the WHO PA guidelines, CrossFit® represents a versatile exercise program that combines aerobic and resistance training with mobility and could help reduce disease incidences among sedentary people. Yet, long-term CrossFit research is sparse. We conducted a nine-month intervention (≥2 CrossFit workouts/week) in 16 beginners (14 males, 35 ± 6.8 years, 180 ± 8.6 cm, 85. 5 ± 19.1 kg). As a primary endpoint, VO2max was assessed at baseline, four, and nine months. A repeated-measures ANOVA and Pearson correlation were conducted. Well-being was investigated by the WHO-5 Index pre- and post-intervention. For exploratory purposes, body composition and heart rate recovery (HRR) were tracked. In a second step, all males were categorized into two groups based on body fat percentage and analyzed by repeated measures ANOVA again. The main outcome was an 11.5% VO2max improvement with a large effect (p < 0.01, η p 2 = 0.27). Strong negative correlations between baseline VO2max and its progression after nine months (p = 0.006, r = −0.654) were found. Well-being increased by 8.7% (p = 0.024, d = 0.51). HRR improved both at 1 min (p < 0.05, η p 2 = 0.34) and at 5 min (p < 0.05, η p 2 = 0.27) post-exercise. Resting metabolic rate increased by 2.2% (p = 0.042). Analysis by group revealed improved HRR at 1 min (p < 0.05, η p 2 = 0.62) only for the "high body fat" group. This study reveals the potential of CrossFit to enhance physiological and psychological health in beginners. For more robust results, larger sample sizes with a higher proportion of women are needed. [ABSTRACT FROM AUTHOR]

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Purpose: To compare the results of Maximum Sprint Speed(MSS), Maximum Aerobic Speed (MAS), Anaerobic Speed Reserve(ASR) and VO2max according to the positions of the players. Methods: This study 5.34±1.44 years of sports history in the football branch, average age is 20.47±1.49 years, average height is 1.76±0.04 m, average weight is 74.41±45.59 kg, was conducted with a total of 91 volunteer male athletes. The study consisted of 2 sessions, 48 hours apart. In the first session, the 10 m speed test was applied, and in the second session, the Yo Yo-1 test was applied. Maximum Sprint speed, Maximal Aerobic Speed, Anaerobic Speed Reserve and VO2max results were calculated with 10 m and Yo Yo-1 test results. After descriptive statistics (Mean±Standard deviation) of all variables were made, One Way ANOVA test was applied to compare according to their positions and Bonferoni correction was applied to determine the difference between groups. Results: There was no significant difference between the Maximum Aerobic Speed, Anaerobic Speed Reserve and VO2max results according to the positions of the players (p>0.05). However, a significant difference was found between the Left Wing and Center Defenders in the Maximal Sprint Speed results in favor of the Left-Wing players (p<0.05). Conclusion: It was determined that the players had similar Maximal Aerobic Speed, Anaerobic Speed Reserve and VO2max performance outputs regardless of the positions they played, but Left-Wing players were faster than Central Defense players in Maximum Sprint Speed. [ABSTRACT FROM AUTHOR]

BACKGROUND: Assessment of maximal oxygen consumption is important in both general community and occupational settings. Validity and reliability tests are needed to indicate the functionality of the cardiopulmonary system. OBJECTIVE: This study aimed to establish a maximal oxygen consumption (VO2max) prediction model using anthropometric and demographic variables for young adults in Iran. METHODS: This cross-sectional study was conducted on 64 healthy young men aged 19–29 years. Oxygen consumption was measured directly and the prediction models to estimate VO2max were determined by multiple linear regression. The accuracy of the prediction models was considered using regression coefficient (R), coefficient of determination (R2), and standard error of estimate (SEE). RESULTS: The average VO2max was 44.02±4.31 ml/kg/min. Significant correlations were found between the measured VO2max and the anthropometric and demographic variables (r = 0.16–0.86, P < 0.05). Three significant regression models with acceptable accuracy were developed (R2 = 0.67–0.71, SEE = 3.19–3.21). CONCLUSION: The predictive models consisted of 3–5 variables as significant predictors of VO2max and had acceptable accuracy for Iranian young adults. The proposed models are a simple and valid tool that can be used to estimate the VO2max in the field and in laboratory settings. [ABSTRACT FROM AUTHOR]

Due to limited accessibility, direct measurement of VO2max is rarely performed in clinical settings or sports centers. As a result, regression equations have been developed and are currently used during exercise tests to provide an indirect estimation. The American College of Sports Medicine (ACSM) has recommended a regression equation for running to provide an indirect estimation of VO2. However, significant differences have been observed between these estimations and directly measured VO2max. Additionally, since submaximal assessments may be more convenient for both athletes and sedentary/diseased individuals, they were included in the analysis. This study aimed to evaluate the accuracy of VO2max estimations provided using the ACSM running equation when used during both maximal and submaximal exercise tests among adult runners. A total of 99 apparently healthy and active adults (age: 39.9 ± 12.2 years; VO2max: 47.4 ± 6.0 mL O2/kg∙min−1) participated in this study. Two types of submaximal estimations were performed to predict VO2max: one based on age-predicted maximal heart rate (HRmax) (ACSMsubmax,Fox), and the second using the actual HRmax measured during the exercise test (ACSMsubmax,measured). The measured VO2max was compared to these estimations obtained from a single exercise test. Both maximal and submaximal exercise tests significantly overestimated VO2max (ACSMmax: +9.8, p < 0.001; ACSMsubmax,Fox: +3.4, p < 0.001; ACSMsubmax,measured: +3.8 mL O2/kg∙min−1, p < 0.001). However, the submaximal estimations were closer to the measured VO2max (p < 0.001). This analysis demonstrated that the included methods overestimated the true VO2max. Nonetheless, the submaximal exercise tests provided a more accurate prediction of VO2max compared to the maximal exercise tests when using the ACSM running equation. [ABSTRACT FROM AUTHOR]

Background: High-intensity interval running exercise (HIIE) is emerging as a time-efficient exercise modality for improving body composition and fitness in comparison with moderate-intensity continuous aerobic exercise (MICE); however, existing evidence is still unclear in children with overweight and thus we compared the effects of HIIE and MICE on body composition, muscular, and cardiorespiratory fitness in children with overweight. Methods: In this randomized study, 40 male children with overweight aged 7–10 years were divided into an 8-week exercise regime: (1) HIIE group [n = 20; 2 sets of 15 × 20s at 85–95% maximal aerobic speed (MAS) separated by 15 × 20s recovery at 50% MAS, 3 days per week] and (2) MICE group [n = 20; 30 min at 60–70% MAS, 3 days per week]. Body composition, muscular and cardiorespiratory fitness were assessed before and after the 8-week intervention at similar times and conditions of the day. Results: Following the 8-week HIIE protocol, weight, BMI, and fat mass decreased significantly (weight: − 1.4% vs. 0.2%, p < 0.05; BMI: − 3.1% vs. − 0.7%, p < 0.05; fat mass: − 7.7% vs. − 1.6%, p < 0.01) as compared with MICE; while the VO2peak and MAS increased significantly in both groups, the increase in HIIE group was significantly greater than that of MICE group (VO2peak: 10.3% vs. 3.5%, p < 0.01; MAS:7.7% vs. 4.5%, p < 0.05). Although significant improvements in muscular fitness were observed in HIIE and MICE groups [counter movement jump (CMJ): 7.8% vs. 5.4%; sprinting ability: − 3.7% vs. − 1.7%], no significant differences were seen between them (p > 0.05). Conclusion: Our findings suggested that school-based HIIE intervention was highly in improving body composition and cardiorespiratory fitness of children with overweight than the MICE regime; however, MICE still provided improvements over time that were just not to the same magnitude of HIIE. [ABSTRACT FROM AUTHOR]

This article presents the findings of a research study conducted at the Sriwijaya State Sports School in South Sumatra, Indonesia. The study aimed to assess the physical fitness of student football athletes by measuring their VO2Max and Forced Vital Capacity (FVC) lung parameters. The results showed that the majority of the athletes had low levels of physical fitness, with 96.9% categorized as "less" and 3.1% as "very less". The study suggests the need for a rigorous and structured training program to improve the athletes' aerobic capacity and lung capacity. The article highlights the importance of physical fitness in soccer and the role of cardiopulmonary endurance in achieving optimal performance. [Extracted from the article]

Hingrand, C, Olivier, N, Combes, A, Bensaid, S, and Daussin, FN. Power is more relevant than ascensional speed to determine metabolic demand at different gradient slopes during running. J Strength Cond Res 37(11): 2298-2301, 2023--Trail running is characterized by successive uphill and downhill running sessions. To prescribe training intensity, an assessment of maximal running capacity is required. This study compared 2 uphill incremental tests using the same ascensional speed increment to identify the influence of the slope gradient on performance. Ten subjects (8 men and 2 women) performed 3 incremental exercises on various slope (1%: IT01, 10%: IT10, and 25%: IT25), and the ascensional speed increment was similar between IT10 and IT25 (100 m·h21 every minute). Gas exchanges, heart rate, and power were monitored continuously during the tests. Similar V̇O2max levels were observed in the 3 conditions: 68.766.2 for IT01, 70.167.3 for IT10, and 67.667.0 for IT25. A greater maximal ascensional speed was reached in the IT25 (1760 6 190 vs. 1,330 6 106 for IT25 and IT10, respectively, p, 0.01). A significant relationship was observed between relative V̇O2 levels and relative power without any effect of slope. Power should be the parameter used for prescribing training intensity compared with ascensional speed in trail. [ABSTRACT FROM AUTHOR]

Carder, MJ, Scudamore, EM, Savanna, KN, Pribyslavska, V, Bowling, LR, and O'Neal, EK. Retrospective and contemporary predictors of National Collegiate Athletic Association Division I cross-country performance are sex specific. J Strength Cond Res 37(11): 2267-2272, 2023--The purpose of this study was to identify National Collegiate Athletic Association (NCAA) Division I cross-country (XC) performance potential using laboratory-based and field-based parameters and retrospective high school (HS) personal best (PB) data at various distances of current collegiate XC runners. Fifteen female and 17 male NCAA XC runners provided their PB for 5-km (women) and 8-km (men) distances from the previous season. Bivariate correlation and stepwise and hierarchical regression modeling were used to predict XC performance. Single squat jump height and multijump reactive strength index displayed r, 0.27 for both sexes, suggesting lower-body power is a poor predictor of XC performance or masked by other factors of greater importance. Triceps skinfold thickness approached significance (r50.43; p50.09) for men but was unrelated to women's performance (r 5 20.05; p 5 0.86). HS XC PB neared significance (r 5 0.55, p 5 0.054), but no other single or combination of variables reached significance for female runners. Aerobic capacity displayed a moderate to strong relationship (r5 0.65) for male runners. High school 3,200-m PB for men produced a robust prediction capacity (r50.85; p50.005, SEE560.65 minutes), and predicted 8-km PB within 30 seconds for approximately two-thirds of runners. These outcomes suggest when recruiting HS or transfer athletes, male and female XC runners should not be recruited on the same factors. Women's XC PB is more difficult to predict, but skinfold thickness was statistically the least valuable predictor of all factors. [ABSTRACT FROM AUTHOR]

• Higher non-exercise estimated cardiorespiratory fitness (NEE-CRF) was associated with lower risk of total cancer incidence in men and women. • Higher NEE-CRF was associated with lower risk of colorectal cancer incidence in men and lower risk of breast cancer incidence in women. • These novel findings suggest that higher fitness levels may provide preventive benefits against the development of cancer, while low fitness could potentially serve as a modifiable cancer risk factor. Non-exercise estimated cardiorespiratory fitness (NEE-CRF) has been shown to be associated with mortality, although its association with cancer incidence is unknown. The study aimed to assess the prospective association between NEE-CRF and cancer incidence in a large cohort of men and women. The National Institutes of Health-American Association of Retired Persons diet and health study is a prospective cohort that included 402,548 participants aged 50–71 years who were free from cancer at baseline (1995–1996) (men (n = 238,835) and women (n = 163,713)) and were followed until December 31, 2015. The exposure variable was NEE-CRF expressed in metabolic equivalents. NEE-CRF was estimated using a validated equation of self-reported predictors on demographics and lifestyle behaviors derived from baseline questionnaires. Primary outcomes were total cancer incidence and incidence of prostate, breast, lung, and colorectal cancers. Cox proportional hazards models were analyzed for the association between NEE-CRF and cancer incidence outcomes adjusted for established cancer risk factors. During 13.7 ± 3.2 years of follow-up (mean ± SD), 64,344 men and 31,315 women developed a new cancer. For every 1-metabolic equivalent higher NEE-CRF, the hazard ratios and 95% confidence intervals (95%CIs) were 0.96 (95%CI: 0.94–0.97) and 0.88 (95%CI: 0.84–0.92) of total and colorectal cancer incidence among men, and 0.95 (95%CI: 0.93–0.97) and 0.94 (95%CI: 0.91–0.97) of total and breast cancer incidence among women, respectively (all p < 0.001). NEE-CRF was not associated with incidence of prostate and lung cancers in men or colorectal and lung cancers in women. These results suggest that higher CRF levels, as assessed by the applied non-exercise estimated method, may provide preventive benefits against the development of cancer, while low CRF could potentially serve as a modifiable cancer risk factor. Integrating NEE-CRF into screening paradigms and referring low-fit individuals to improve CRF could complement the public health prevention strategy against cancer. [ABSTRACT FROM AUTHOR]

Purpose: Currently, there is no interventional approach to increase the intensity of SuryaNamaskar a popular hatha yoga sequence used worldwide. Therefore, this study investigated how tempo-based high-intensity interval cardio yoga (HIICY) and traditional interval hatha yoga (TIHY) affects cardiometabolic fitness in active adults. Methods: Twenty physically active male and female individuals were randomly separated into HIICY (5 males, 5 females, 1.5 s tempo) and TIHY (5 males, 5 females, 3 s tempo) groups. The intervention included twelve exercise sessions for 4 weeks in both groups. Participants conducted a ramp test to determine their maximal oxygen uptake (VO2max), maximal velocity at V_O2max (VO2max), and maximal heart rate (HRmax). Afterward, they performed a 10-min high-intensity cardio yoga test (HICYT) to determine heart rate (HRpeak and HRmean), oxygen uptake (VO2peak and VO2mean), respiratory exchange ratio (RER), blood lactate concentrations (La-peak and ?La-), fat and carbohydrate oxidations (FATox, CHOox), and energetic contributions (oxidative; WOxi, glycolytic; WGly, and phosphagen; WPCr, total energy demand; WTotal). Results: VO2max and VO2max showed time and group × time interactions (p < 0.01, p < 0.0001, p < 0.001, respectively). VO2max after HIICY was significantly higher than in pre-testing and following TIHY (p < 0.001, p < 0.0001, respectively). VO2peak, VO2mean, RER, HRpeak, and HRmean during the 10-min HICYT showed significant time effects (p < 0.05). ?La- indicated a group × time interaction (p < 0.05). Group x time interaction effects for FATox at the fourth and sixth minute were observed (p < 0.05, respectively). Absolute (kJ) and relative (%) WOxi, WGly, and WTotal showed time and group × time interaction effects (p < 0.05, p < 0.01, respectively). Furthermore, %WGly was reduced following HIICY (p < 0.05). Additionally, VO2max and VO2max were highly correlated with WOxi in kJ (r = 0.91, 0.80, respectively). Moderate to high correlations were observed among CHOox, FATox, and absolute VO2max (r = 0.76, 0.62, respectively). Conclusion: A 4-week period of HIICY improved cardiometabolic fitness, oxidative capacity, and metabolic flexibility compared with TIHY, in physically active adults. Therefore, HIICY is suitable as HY-specific HIIT and time-efficient approach for relatively healthy individuals. [ABSTRACT FROM AUTHOR]

Background: The ever-increasing sport level makes every single detail of the athlete's cardiorespiratory profile count, and therefore, it is deemed crucial to clarify how the anterior cruciate ligament (ACL) reconstruction (ACLR) affects the energy economy of an athlete compared to the ACL-deficient and healthy subjects. The purpose of this review was to systematically analyze the studies investigating the correlation between the energy-oxygen cost in patients following ACLR in unreconstructed and intact ACLs. Methods: We conducted this systematic review according to the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines. PubMed, Cochrane, and Google Scholar databases were searched, and eight articles describing miscellaneous methods for the assessment of oxygen consumption in patients with ACL deficiency or ACL reconstructed knees were included. Results: In total, 285 subjects were recorded with a mean age of 29.61 years. The type of exercise the patients were subjected to varied among the studies, including one-leg cycling, exercise in the closed kinetic chain, walking, jogging, or running at various speeds, and treadmill inclinations. The energy expenditure of an ACL-deficient patient is considerably higher than a healthy subject. Additionally, chronicity of the ACL tear is not correlated with energy expenditure. ACL deficiency leads to higher energy consumption, not only during walking but during jogging as well. ACLR could improve the efficiency of walking by lowering the energy demands. After ACLR, professional soccer players' aerobic capacity (VO2max) is improved significantly. Conclusions: ACL insufficiency affects substantially the metabolic energy costs, resulting in increased energy expenditure. According to current literature, ACLR can help to partially reverse this condition, as significant improvements and a more efficient, energy-wise, locomotion are expected. However, further research is necessary to clarify if ACLR can completely normalize energy expenditure again. [ABSTRACT FROM AUTHOR]

Summary: The occupational demands of law enforcement increase the risk of poor‐quality sleep, putting officers at risk of adverse physical and mental health. This cross‐sectional study aimed to characterise sleep quality in day workers, 8 and 12 h rotating shift pattern workers. One hundred eighty‐six officers volunteered for the study (37 female, age: 41 ± 7). Sleep quality was assessed using the Pittsburgh sleep quality index, actigraphy and the Leeds sleep evaluation questionnaire. The maximal aerobic capacity (VO2max) was measured on a treadmill via breath‐by‐breath analysis. There was a 70% overall prevalence of poor sleepers based on Pittsburgh sleep quality index scores, where 8 h shifts exhibited the worst prevalence (92%, p = 0.029), however, there was no difference between age, gender, or role. In contrast, 12 h shifts exhibited the poorest short‐term measures, including awakening from sleep (p = 0.039) and behaviour following wakefulness (p = 0.033) from subjective measures, and poorer total sleep time (p = 0.024) and sleep efficiency (p = 0.024) from the actigraphy. High VO2max predicted poorer wake after sleep onset (Rsq = 0.07, p = 0.05) and poorer sleep latency (p = 0.028). There was no relationship between the Pittsburgh sleep quality index scores and any of the short‐term measures. The prevalence of poor sleepers in this cohort was substantially higher than in the general population, regardless of shift pattern. The results obtained from the long‐ and short‐term measures of sleep quality yielded opposing results, where long‐term perceptions favoured the 12 h pattern, but short‐term subjective and objective measures both favoured the 8 h pattern. [ABSTRACT FROM AUTHOR]

Background: Female football becomes popular in last decades. The body fat, strength, power, endurance etc are playing an important role in female football. The present study has been designed to investigate the effects of 6 weeks of training on body composition, physical fitness and physiological variables of female football players. Materials and Methods: A total of eighty two female football players (age 16-18 yrs.) participated were included and twenty two were excluded from the study, the remaining were divided into control group (CG, n = 30) and experimental group (EG, n = 30). The volunteers of the experimental group followed a training programme (2 hrs/day, 5day/week, for 6 weeks), whereas no training was given volunteers of the control group. Selected body composition, physical fitness and physiological variables were performed at the beginning (0 week) and at the end of the study (6 weeks). Results: A significant reduction (p < .05) in body mass, body fat, resting heart rate, recovery heart rate, and systolic blood pressure; and an increase (p < .05) in strength, anaerobic power, VO2max, FEV1, FVC and PEFR was noted after 6 weeks of training. Body fat showed negative correlation with back strength (r = - 0.26, p < .05), grip strength (r = -0.46, p < .01), anaerobic capacity (r = -0.30, p < .05) and flexibility (r = -0.32, p < .05) of the volunteers. LBM showed positive correlation with grip strength right (r = 0.59, p < .05), grip strength left (r = 0.53, p < .05), back strength (r = 0.73, p < .05), flexibility (r = 0.41, p < .05). The anaerobic power showed a significant positive correlation with VO2max (r = 0.51, p < .01). Conclusions: Regular monitoring of the indicators is essential to obtain optimal performance of the players. [ABSTRACT FROM AUTHOR]

Football is popular sports worldwide and required high level of physical fitness and physiological demand. Training may improve the physical fitness and physiological variables when given according to the principle of periodization. The present study was designed to investigate the effects of training on anthropometric, physical fitness and physiological variables of football players. Ninety five male football players (age 14-16 yrs.) were included, and twenty five were excluded, the remaining seventy were divided into control group (CG, n = 35) and experimental group (EG, n = 35). The volunteers of EG followed a training (2 hrs/d, 5 d/wk., for 6 wks.), no training was followed for CG. Assessments of anthropometric, physical fitness and physiological variables were performed at 0 week and after 6 weeks. Paired sample t-test was performed to find out the differences in selected variables. An increase (p < .05) in grip and back strength, flexibility, anaerobic power, VO2max, FEV1, FVC and PEFR; and reduction (p < .05) in body mass, BMI, percent body fat, fat mass, reaction time of hands, resting heart rate, systolic blood pressure, pulse pressure were noted among the volunteers of experimental group after 6 weeks of training. Training may improve the anthropometric, physical fitness and physiological variables of the football players, and thus improve performance. [ABSTRACT FROM AUTHOR]

Pilates-mat is an effective training method to enhance several physiological and fitness parameters, although the effects of pilates-mat detraining on body composition and physical fitness remains largely unknown. The purpose of the study was to investigate the effect of pilates-mat training and detraining on body composition and physical fitness in pilates-trained females. Twenty females (age: 45.1 ± 8.7 years) followed an 8-week pilates-mat training program followed by a 3-week detraining period. Measurements performed at the beginning of the training intervention, at the end of the 8-week training program and at the end of the 3-week detraining period and included: anthropometric characteristics, body composition analysis, thigh, hip and waist circumferences, blood pressure, heart rate at rest (HRr), maximum handgrip strength, abdominal curls, lower body flexibility and aerobic capacity. Pilates-mat training significantly decreased body fat percentage (BF%), visceral fat and HRr (p < 0.05) but these variables returned to baseline after detraining. Trunk fat, thigh and waist circumferences decreased significantly after training and remained significantly low following detraining (p < 0.05). Abdominal curls, lower body flexibility and aerobic capacity increased significantly following pilates-mat training and remained unchanged after detraining (p < 0.05). These results suggest that 8 weeks of pilates-mat training enhanced body composition and physical fitness and these physiological and physical fitness benefits were remained unaltered during the 3-week of pilates-mat detraining period. However, BF% and visceral fat returned to baseline levels following the detraining period suggesting that for maintaining the reduction in BF% and visceral fat a long-period of pilates-mat detraining should be avoided. [ABSTRACT FROM AUTHOR]

Aerobic capacity is crucial for the performance of soccer players; however, the relationship between VO2max and the running performance of soccer players with visual impairment is not known. Possibly finding relationships would help in the training process, as training would be more targeted. Additionally, both bodyweight and relative VO2max are factors that affect people's health and wellness. From the literature, it appears that there are no studies that present the normal profile of soccer players with visual impairment. The aims of this study were to (a) determine the differences in VO2max between soccer players and sedentary men with visual impairment; (b) to assess the relationship between the VO2max of players with visual impairment and the distance covered in a soccer match and (c) to describe a profile of physiological parameters and distance running during a soccer match. Six male soccer players with VI and six male sedentary people with VI participated in this study. Anthropometric characteristics (age, height, bodyweight, body fat (BF), body mass index (BMI), cardiorespiratory markers (VO2max, maximum heart rate (HRmax), respiratory exchange ratio (RER)) and the running performance of soccer players during matches were measured, and the VO2max of all the participants was measured in a laboratory. Mann–Whitney U test was used to evaluate differences between sedentary and soccer players' anthropometric characteristics and performance. A correlation analysis by Spearman's' method was used to examine relationships between VO2max and the rest of the physical values during the match. The level of statistical significance was set at p < 0.05. The soccer players' weight was 33% lower, and their BMI was 23% lower than that of sedentary men (p = 0.023, η2 = 0.457 and p = 0.048, η2 = 0.394, respectively). The relative body mass VO2max of the athletes was 42.9% higher in comparison with sedentary men with VI (p = 0.002, η2 = 0.755). No correlations were found between VO2max and match running performance (p = 0.957, r = −0.029) or other parameters during the match in soccer players with VI. In conclusion, relative VO2max is not related to the match running performance of soccer players. The tactics applied by the team, the style of play and the position of the player may affect the distances covered. Also, as expected, the soccer players showed lower bodyweight and higher relative VO2max. However, this is the first study to observe the level of these differences. [ABSTRACT FROM AUTHOR]

Copyright of Retos: Nuevas Perspectivas de Educación Física, Deporte y Recreación is the property of Federacion Espanola de Asociaciones de Docentes de Educacion Fisica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Retos: Nuevas Perspectivas de Educación Física, Deporte y Recreación is the property of Federacion Espanola de Asociaciones de Docentes de Educacion Fisica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Introduction: In the majority of the available source materials, research on the level of physical capacity of athletes concerns members of sports clubs and national teams, in a word, professional athletes. Does this mean that such research should not be conducted on recreational athletes? Of course not. The main aim of this article was to assess physical capacity (based on VO2max) in recreationally active people from the Podkarpackie region of Poland. The authors intended to determine whether practicing recreational sports without adequate technical facilities and staff influenced the course of their training and achievements. Material and Methods: The study involved 413 participants (body height 174.5 ± 9.5 cm; body weight 73.4 ± 20.3 kg) aged 18-60 years. Each participant followed the same treadmill test protocol and completed a questionnaire survey related to the number of injuries sustained. To determine the level of fitness, AT (VT1), RCP (VT2), VO2peak, and HRmax were determined during the study. Results: Based on the Powers and Howley classification, almost 50% of the participants were classified in the subgroup with the highest possible peak oxygen uptake (41.4%). More than one in four participants had a peak oxygen uptake at a very good level (28.3%), nearly one in five at good (18.9%), while more than one in ten reached an average (9.4%), low (1.5%), or very low (0.5%) levels. Individuals with multiple injuries achieved significantly higher scores on average in contrast to those without injuries (p=0.004). Conclusions: Physically active people have a high above-normal level of physical capacity, despite the recreational form of their sport. The study showed the importance of research on physically active people not only in the context of fitness. This group includes outstanding individuals achieving high performance similar to professional athletes. [ABSTRACT FROM AUTHOR]

Purpose: To compare the aerobic capacity of elite female basketball players between playing roles and positions determined using maximal laboratory and field tests. Methods: Elite female basketball players from the National Croatian League were grouped according to playing role (starter: n = 8; bench: n = 12) and position (backcourt: n = 11; frontcourt: n = 9). All 20 players completed 2 maximal exercise tests in a crossover fashion 7 days apart. First, the players underwent a laboratory-based continuous running treadmill test with metabolic measurement to determine their peak oxygen uptake (VO2peak). The players then completed a maximal field-based 30-15 Intermittent Fitness Test (30-15 IFT) to estimate VO2peak. The VO2peak was compared using multiple linear regression analysis with bootstrap standard errors and playing role and position as predictors. Results: During both tests, starters attained a significantly higher VO2peak than bench players (continuous running treadmill: 47.4 [5.2] vs 44.7 [3.5] mL·kg-1·min-1, P = .05, moderate; 30-15 IFT: 44.9 [2.1] vs 41.9 [1.7] mL·kg-1·min-1, P < .001, large), and backcourt players attained a significantly higher VO2peak than frontcourt players (continuous running treadmill: 48.1 [3.8] vs 43.0 [3.3] mL·kg-1·min-1, P < .001, large; 30-15 IFT: 44.2 [2.2] vs 41.8 [2.0] mL·kg-1·min-1, P < .001, moderate). Conclusions: Starters (vs bench players) and guards (vs forwards and centers) possess a higher VO2peak irrespective of using laboratory or field tests. These data highlight the role- and position-specific importance of aerobic fitness to inform testing, training, and recovery practices in elite female basketball. [ABSTRACT FROM AUTHOR]

Purpose: To examine the relationship between the maximal power output (MPO) in an individualized 7 x 2-minute incremental (INCR) test, average power in a 2k (W2k) rowing ergometer test, and maximal oxygen uptake (VO2max) and to develop a regression equation to predict VO2max. Methods: A total of 34 male club rowers (age 18-30 y) performed a 2k and an INCR test in a Concept2 rowing ergometer to determine and compare MPO, W2k, and VO2max. Results: No significant difference was found between VO2max measured during INCR or 2k test (P = .73). A very high correlation coefficient (r = .96) was found between MPO and VO2max and between W2k and VO2max (r = .93). Linear regression analyses were developed for predicting VO2max from MPO: (1) VO2max (mL·min-1) = 11.49 x MPO + 810 and VO2max from W2k: (2) VO2max = 10.96 x W2k + 1168. Cross-validation analyses were performed using an independent sample of 14 rowers. There was no difference between the mean predicted VO2max in the INCR test (4.41 L·min-1) or the 2k test (4.39 L·min-1) and the observed VO2max (4.40 L·min-1). Technical error of measurement was 3.1% and 3.6%, standard error of estimate was 0.136 and 0.157 mL·min-1, and validation coefficients (r) were .95 and .94 using Equation (1) and (2), respectively. Conclusion: A prediction model only including MPO or W2k explains 88% to 90% of the variability in VO2max and is suggested for practical use in male club rowers. [ABSTRACT FROM AUTHOR]

Caffeine is a compound found in the leaves, seeds and fruits of plants such as coffee and guarana. The aim of the systematic review was to determine the influence of caffeine on cardiorespiratory functions and physical performance. The method was the collection of relevant literature in the period from 2011-2022, and their analysis. The results clearly show the benefit and positive influence of caffeine on both investigated areas. The recommended consumption of caffeine should be higher than 75mg in order to expect positive changes and effects. Also, doses above 600mg should not be exceeded due to side effects, especially on the heart. It is necessary to consume caffeine for at least 45 minutes before the planned activity to ensure complete absorption. Caffeine is a very powerful supplement, it is only necessary to take care of the method and amount of dosage.

Background and Study Aim. The physiological [Maximum oxygen uptake (VO2max), Peak Inspiratory Flow (PIF), Peak Expiratory Flow (PEF), Force Vital Capacity (FVC)] and physical performance measures [power, dynamic balance, flexibility, agility, and speed] are the key determinants in random intermittent dynamic type sports which enable the players to address decisive situations. Therefore, the purpose of this study was to determine the physiological and physical measures among athletes from random intermittent dynamic type sports. Material and Methods. A comparative cross-sectional study with 56 male athletes, 14 in each sport (Rugby, Soccer, Volleyball, Futsal) was conducted. The mean age was 23.59±4.27 years, body mass 71.96±10.10 kg, body height 174.71±6.82 cm, and BMI 23.51±2.38 kg/m2. Physiological characteristics and physical performance measures were measured by using dry spirometer and functional tests respectively. A one-way analysis of variance test was performed to determine differences between athletes for physiological and physical performance measures. Results. There were significant differences for physiological characteristics (VO2max, PIF, PEF, and FVC) and physical performance measures (power, dynamic balance, flexibility, agility and speed) in athletes from random intermittent dynamic type sports. Conclusions. These findings showed significant differences for physiological and physical performance characteristics among athletes from random intermittent dynamic type sports. These measures are responsible for improving physiological and physical performance to achieve top athletic achievements. While constructing the training program, morphological and functional factors should be considered based on the game’s nature.

Cardiac deaths account for the largest share of on-duty firefighter deaths. To help ensure duty fitness and minimize injury risk, many fire departments require the passing of an annual physical ability test, consisting of a battery of simulated fire suppression activities (sFSAs). The purpose of the study was to determine the relationship of sFSA performance to acute cardiac and respiratory events (ACREs) and the effect that estimated VO2max has on sFSA performance. The study was retrospective. As part of an annual physical ability test, five timed sFSAs were performed, summed for a composite time, and categorized into three performance levels (fast, moderate, and slow). Estimated VO2max was determined using the Forestry Step Test. A significant (p = 0.023) linear trend was observed with higher sFSA performance times being associated with a higher proportion of firefighters going on to suffer an ACRE. The estimated VO2max was significantly (p < 0.001) higher in the fast group compared to the slow group. There was not a significant (p = 0.70) difference in estimated VO2max between the moderate and slow groups. Estimated VO2max performance and sFSA performance were significantly correlated, with rs(488) = −0.272 and p < 0.001. Poorer sFSA performance was found to be associated with a higher proportion of ACREs. The results suggest that sFSA performance may be a valid indicator of ACRE injury risk and aerobic capacity.

The objectives of this study were to investigate (a) the relationship between the Yo-Yo intermittent recovery test level 1 (YYIR1) and a laboratory test for measuring maximal oxygen uptake (VO2max), (b) the relationships between anthropometric characteristics and variables of the two aerobic tests (field and laboratory), and (c) differences in performance and anthropometric characteristics among five different playing positions. The study involved 27 U17 young soccer players (16.0 ± 0.6 years). They randomly underwent a maximal laboratory treadmill test to measure VO2max and the YYIR1 test. Pearson correlation was used to find potential correlations, and a one-way ANOVA was used to find differences between playing positions. Statistical significance was set at p < 0.05. The results showed that height was moderately negatively correlated (r = −0.455, p = 0.017) as well as body mass (r = −0.395, p = 0.042). Significant positive correlation was observed between vVO2max and the distance covered in YYIR1 (r = 0.393, p = 0.042). Finally, no differences were observed between playing positions in any anthropometric characteristic or in any variable of the two aerobic tests (laboratory or field) (p > 0.05). In conclusion, the YYIR1 test is not suitable for estimating VO2max. Additionally, the lack of differences between playing positions may be due to the limited specialization of the training load received by the players until this age.

Background Low energy availability (LEA) can have negative performance consequences, but the relationships between LEA and performance are poorly understood especially in field conditions. In addition, little is known about the contribution of macronutrients to long-term performance. Therefore, the aim of this study was to evaluate if energy availability (EA) and macronutrient intake in a field-based situation were associated with laboratory-measured performance, anthropometric characteristics, blood markers, training volume, and/or questionnaire-assessed risk of LEA in young female cross-country (XC) skiers. In addition, the study aimed to clarify which factors explained performance. Methods During a one-year observational study, 23 highly trained female XC skiers and biathletes (age 17.1 ± 1.0 years) completed 3-day food and training logs on four occasions (September–October, February–March, April–May, July–August). Mean (±SD) EA and macronutrient intake from these 12 days were calculated to describe yearly overall practices. Laboratory measurements (body composition with bioimpedance, blood hormone concentrations, maximal oxygen uptake (VO2max), oxygen uptake (VO2) at 4 mmol·L−1 lactate threshold (OBLA), double poling (DP) performance (time to exhaustion), counter movement jump (height) and the Low Energy Availability in Females Questionnaire (LEAF-Q)) were completed at the beginning (August 2020, M1) and end of the study (August 2021, M2). Annual training volume between measurements was recorded using an online training diary. Results The 12-day mean EA (37.4 ± 9.1 kcal·kg FFM−1·d−1) and carbohydrate (CHO) intake (4.8 ± 0.8 g·kg−1·d−1) were suboptimal while intake of protein (1.8 ± 0.3 g·kg−1·d−1) and fat (31 ± 4 E%) were within recommended ranges. Lower EA and CHO intake were associated with a higher LEAF-Q score (r = 0.44, p = 0.042; r = 0.47, p = 0.026). Higher CHO and protein intake were associated with higher VO2max (r = 0.61, p = 0.005; r = 0.54, p = 0.014), VO2 at OBLA (r = 0.63, p = 0.003; r = 0.62, p = 0.003), and DP performance at M2 (r = 0.42, p = 0.051; r = 0.44, p = 0.039). Body fat percentage (F%) was negatively associated with CHO and protein intake (r = -0.50, p = 0.017; r = -0.66, p = 0.001). Better DP performance at M2 was explained by higher training volume (R2 = 0.24, p = 0.033) and higher relative VO2max and VO2 at OBLA at M2 by lower F% (R2 = 0.44, p = 0.004; R2 = 0.47, p = 0.003). Increase from M1 to M2 in DP performance was explained by a decrease in F% (R2 = 0.25, p = 0.029). Conclusions F%, and training volume were the most important factors explaining performance in young female XC skiers. Notably, lower F% was associated with higher macronutrient intake, suggesting that restricting nutritional intake may not be a good strategy to modify body composition in young female athletes. In addition, lower overall CHO intake and EA increased risk of LEA determined by LEAF-Q. These findings highlight the importance of adequate nutritional intake to support performance and overall health.