Search

Background and study aim. The warm-up phase in youth soccer can be used to introduce drills that do not find space within the training session. Core district exercises give stability to the trunk and hips, allowing for increased performance and reducing the risk of non-contact injuries. This study aims to test the effects of a warm up integrated with core stability exercises on the motor abilities in young soccer players. Material and methods. Young soccer players (n=32, 12.45±0.52 years, 1.49±0.05 m, 44±2.90 kg) were randomly divided into two groups: experimental (EG=17) and control group (CG=15). The EG performed an integrated warm-up with core stability tasks for 6 weeks (12 sessions). The CG followed the usual training schedule based on technical tactical and physical drills. Performance was assessed through broad jump, Hop test, Side Hop test, 10-meter sprint and 10x5-meter shuttle test. Results. Data analysis returns some statistically significant differences in intergroup comparison (T1): for broad jump (p = .008), for left limb Hop test (p = .02), for right limb Hop test (p = .02), for left limb Side Hop (p = .03), for right limb Side Hop (p = .04), for sprint 10-meters (p = .002), for shuttle run 10x5-meters (p = .03). Conclusions. The core stability exercises in the warm up seems to increase some performance correlated with the motor abilities stressed in the soccer. The warm up through appropriate modifications can represent, a useful and integrative moment to elicit more factors of performance and prevention.

Background and Study Aim The warm-up phase in youth soccer can be used to introduce drills that do not find space within the training session. Core district exercises give stability to the trunk and hips, allowing for increased performance and reducing the risk of non-contact injuries. This study aims to test the effects of a warm up integrated with core stability exercises on the motor abilities in young soccer players. Material and Methods Young soccer players (n=32, 12.45±0.52 years, 1.49±0.05 m, 44±2.90 kg) were randomly divided into two groups: experimental (EG=17) and control group (CG=15). The EG performed an integrated warm-up with core stability tasks for 6 weeks (12 sessions). The CG followed the usual training schedule based on technical tactical and physical drills. Performance was assessed through broad jump, Hop test, Side Hop test, 10-meter sprint and 10x5-meter shuttle test. Results Data analysis returns some statistically significant differences in intergroup comparison (T1): for broad jump (p = .008), for left limb Hop test (p = .02), for right limb Hop test (p = .02), for left limb Side Hop (p = .03), for right limb Side Hop (p = .04), for sprint 10-meters (p = .002), for shuttle run 10x5-meters (p = .03). Conclusions The core stability exercises in the warm up seems to increase some performance correlated with the motor abilities stressed in the soccer. The warm up through appropriate modifications can represent, a useful and integrative moment to elicit more factors of performance and prevention. [ABSTRACT FROM AUTHOR]

Abstract Background Emerging evidence suggests that children’s fatness increases and fitness declines at a greater rate during the summer holiday period, compared with the school year. The aim of this study was to compare rates of change in fitness and fatness over the in-term and summer holiday periods among Australian schoolchildren. A secondary aim was to explore whether rates of change differed according to the child’s sex, socio-economic status (SES), pubertal status and weight status. Methods Children (n = 381) initially in Grade 4 (age 9) were recruited for this 2-year longitudinal study. Fatness (% body fat, BMI z-score, waist-to-height ratio) and fitness (20-m shuttle run and standing broad jump) were measured at the start and end of two consecutive years. Rates of change were calculated for the two in-school periods (Grades 4 and 5) and for the summer holiday period. Rates of change in fatness and fitness between in-school and holiday periods were compared, and differences in rates of change according to sex, socio-economic status, and weight status were explored. Results During the holidays, percentage body fat increased at a greater rate (annualised rate of change [RoC]: +3.9 vs. Grade 4 and + 4.7 vs. Grade 5), and aerobic fitness declined at a greater rate (RoC − 4.7 vs. Grade 4 and − 4.4 vs. Grade 5), than during the in-school periods. There were no differences in rates of change for BMI z-score, waist-to-height ratio or standing broad jump. Body fatness increased faster in the holidays (relative to the in-school period) in children who are overweight and from low-SES families. Aerobic fitness declined more rapidly in the holidays in children who are overweight. Conclusion This study highlights that during the summer holiday period, children experience greater increases in fatness and declines in fitness, with children who live with low-SES families and are overweight being more affected. The findings suggest the need for targeted interventions during this period to address these negative health trends. Trial registration Australia New Zealand Clinical Trials Registry, identifier ACTRN12618002008202. Retrospectively registered on 14 December 2018.

The low understanding of techniques in soccer games includes dribbling technique, which refers to ball control and maneuvering using the feet. The aim of this research is to determine the influence of Shuttle Run training on the agility of dribbling skills in soccer athletes. The research design employed is a quasi-experimental study. The population of the study consists of 30 athletes from Sumber Harta Musi Rawas Soccer Club, aged between 17 and 20 years. The sample for this study is comprised of all 30 athletes from Sumber Harta Musi Rawas Soccer Club. The data analysis technique used is the "t-test" to obtain the results, with a critical value of 1.70 derived from the T-distribution table with degrees of freedom (df) of 39. The conclusion drawn from the study is that Shuttle Run training has a significant impact on improving dribbling agility in soccer games for the athletes of Sumber Harta Musi Rawas Soccer Club. The research findings also indicate that Shuttle Run training is an effective method for enhancing agility.

Background: Emerging evidence suggests that children's fatness increases and fitness declines at a greater rate during the summer holiday period, compared with the school year. The aim of this study was to compare rates of change in fitness and fatness over the in-term and summer holiday periods among Australian schoolchildren. A secondary aim was to explore whether rates of change differed according to the child's sex, socio-economic status (SES), pubertal status and weight status. Methods: Children (n = 381) initially in Grade 4 (age 9) were recruited for this 2-year longitudinal study. Fatness (% body fat, BMI z-score, waist-to-height ratio) and fitness (20-m shuttle run and standing broad jump) were measured at the start and end of two consecutive years. Rates of change were calculated for the two in-school periods (Grades 4 and 5) and for the summer holiday period. Rates of change in fatness and fitness between in-school and holiday periods were compared, and differences in rates of change according to sex, socio-economic status, and weight status were explored. Results: During the holidays, percentage body fat increased at a greater rate (annualised rate of change [RoC]: +3.9 vs. Grade 4 and + 4.7 vs. Grade 5), and aerobic fitness declined at a greater rate (RoC − 4.7 vs. Grade 4 and − 4.4 vs. Grade 5), than during the in-school periods. There were no differences in rates of change for BMI z-score, waist-to-height ratio or standing broad jump. Body fatness increased faster in the holidays (relative to the in-school period) in children who are overweight and from low-SES families. Aerobic fitness declined more rapidly in the holidays in children who are overweight. Conclusion: This study highlights that during the summer holiday period, children experience greater increases in fatness and declines in fitness, with children who live with low-SES families and are overweight being more affected. The findings suggest the need for targeted interventions during this period to address these negative health trends. Trial registration: Australia New Zealand Clinical Trials Registry, identifier ACTRN12618002008202. Retrospectively registered on 14 December 2018. [ABSTRACT FROM AUTHOR]

Copyright of Revista Foco (Interdisciplinary Studies Journal) is the property of Revista Foco 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.)

Physical fitness is an important health indicator and component of physical literacy. Therefore, monitoring youth fitness performance is crucial for identifying potential health risks and tracking physical literacy development. Over the years, many fitness test batteries have been developed while different protocols for footwear have been used in fitness testing. The comparison of fitness results performed in different footwear could therefore be questioned. Thus, the purpose of this study was to examine the differences between barefoot and shod performance of selected motor tests in adolescents. Eighty-six adolescents aged between 14 and 16 years performed standing long jump, 20-m shuttle run, and polygon backwards in both footwear conditions. A strong correlation (r=0.83-0.95) was noted between both performances. No significant differences between barefoot and shod performance in the standing long jump and the backward obstacle course test were found, while significant differences were noted in the 20-m shuttle run. In this test, both, boys and girls performed better in shod conditions. Interestingly, there were no significant differences in performance of all tests among those who are habitually barefoot and others. From practical perspective, this study demonstrated that researchers could compare scores of samples in barefoot and shod performance of standing long jump and backward obstacle course tests. However, when physical teachers compare individual scores over the years, this should be made under the same footwear conditions, as differences in test conditions can provide a distorted picture of motor development. [ABSTRACT FROM AUTHOR]

Purpose: Variables currently used in soccer training monitoring fail to represent the physiological demand of the player during movements like accelerations, decelerations, and directional changes performed at high intensity. We tested the hypothesis that respiratory frequency (fR) is a marker of physical effort during soccer-related high-intensity exercise. Methods: A total of 12 male soccer players performed a preliminary intermittent incremental test and 2 shuttle-run high-intensity interval training (HIIT) protocols, in separate visits. The 2 HIIT protocols consisted of 12 repetitions over 9 minutes and differed in the work-to-recovery ratio (15:30 vs 30:15 s). Work rate was self-paced by participants to achieve the longest possible total distance in each HIIT protocol. Results: Work-phase average metabolic power was higher (P < .001) in the 15:30-second protocol (31.7 [3.0] W·kg-1) compared with the 30:15-second protocol (22.8 [2.0] W·kg-1). Unlike heart rate and oxygen uptake, fR showed a fast response to the work--recovery alternation during both HIIT protocols, resembling changes in metabolic power even at supramaximal intensities. Large correlations (P < .001) were observed between fR and rating of perceived exertion during both 15:30-second (r = .87) and 30:15-second protocols (r = .85). Conclusions: Our findings suggest that fR is a good marker of physical effort during shuttle-run HIIT in soccer players. These findings have implications for monitoring training in soccer and other team sports. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Sport & Health Research is the property of Journal of Sport & Health Research 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 International Journal of Racket Sports Science is the property of International Journal of Racket Sports Science 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.)

Motor skills in children are a skill that every child must master. Having less than optimal gross motor activity makes children can interfere with activities in children. So it requires a solution to improve gross motor skills in order to develop optimally. This study aimed to find out the effectiveness of motor improvement in children aged 4-6 years. The research method used is Classroom Action Research, with data collection in this study using performance, observation, interviews, and documentation. The subjects of this study used a saturated sampling technique of 45 children of Mujahideen Kindergarten 2 Pontianak. Data analysis compares the results obtained from cycle I and cycle II with descriptive quantitative approaches. The results of this study showed an increase in children's gross motor skills through shuttle run games, and ball bounce throwing, evidenced by the number of students who increased their motor skills from 45 students from the first cycle of 16% or 16 students classified as good motor and in cycle II increased from 45 students 71% or 32 students fall into the category of good. Shuttle run and ball bounce throw are solutions to improve gross motor skills in children aged 4-6 years.

The purpose of this study is to establish a simpler way to assess cardiopulmonary function in handball athletes whose continuous aerobic ability is vital in games using field tests, as well as to provide basic data on changes in lactic acid concentration. A total of 8 youth elite male handball athletes participated in this study. Participants visited three times in total. The first was assigned to graded exercise test and body composition measurements. Participants were then randomly assigned to a 20-meter shuttle ride or Yo-Yo Intermediate Recovery. All participants measured the lactic acid concentration after each exercise test. There were no significant differences in the VO2max (ml/kg/min) results in each test. There was no significant difference immediately after exercise of each test, after 5 minutes, after 10 minutes, and after 20 minutes. Compared to the golden standard GXT, there is no difference in maximum oxygen intake and lactic acid concentration after the two field tests, so both tests are expected to be efficiently used to evaluate the aerobic ability and develop training programs in the field. [ABSTRACT FROM AUTHOR]

The ongoing COVID-19 pandemic not only impacted the health of school children directly through SARS-CoV-2 infections, but the associated closures of schools and sports facilities also resulted in long-term negative side effects. The aim of this study was to investigate the effects of COVID-19-related mitigation measures on the health and fitness status of primary school children in Austria. A total of 303 primary school children participated in the longitudinal study. Data on height, weight, and fitness were collected before the COVID-19 pandemic (September 2019) and at one-year intervals (September 2020 and September 2021) during the course of the pandemic. In the first year, from September 2019 to September 2020, there were alarming increases in body mass index (BMI) standard deviation scores (SDSs) (from 0.32 to 0.49) and dramatic decreases in both cardiorespiratory endurance (CRE) (from 0.49 to −0.43) and action speed (from −0.31 to −0.64). In the second year (September 2020 to September 2021), the BMI scores stabilized, and improvements in CRE were observed, especially in the subgroup of children who were members of sports clubs. In the future, more initiatives and projects, in addition to sports club activities, should be started and expanded, particularly in schools, to specifically counteract the observed health damage and, thus, have a positive effect on the development of all children, especially those without sports club membership. [ABSTRACT FROM AUTHOR]

The purpose of the present study was to examine the effects of a strategic self-talk intervention on basketball free throw performance under conditions of physical exertion. Forty-one male basketball players (Mage = 23.19 years) participated in the study. Following a baseline assessment, a 3-week intervention was implemented. During this period participants of the two groups practiced the same number of free throws in their training sessions; participants of the experimental group practiced using self-talk and developed personal free throw self-talk plans. In the final assessment, the participants repeated the free throw test following a typical shuttle run task causing increased physical exertion. The results showed that in the final assessment the self-talk group performed significantly better than the control group. Overall, the findings indicate that self-talk can be an effective strategy for basketball players when performing free throw under conditions of physical exertion, which is a typical situation in basketball games.

ObjectivesDetermine the temporal trends in cardiorespiratory fitness (CRF) and health risk of Slovenian schoolchildren across a 20-year span, assessed via 20-m shuttle run (20mSRT), including defining centile ranges and possible health risk(s) for each generation.MethodsNationally representative data from 9,426 healthy schoolchildren (6–14 years old) were used to determine changes in CRF across three generations, in 1993 (n = 3,174), 2003 (n = 3,457) and 2013 (n = 2,795) from a multistage, stratified, decennial study.Results20mSRT performance declined ∼2.8% from 1993 to 2003, independent of age or sex of the child. This trend was reversed in 2013, increasing by ∼8.2% across all age groups, for both girls and boys, for a net increase of 5.4%. The magnitude of improvement was similar for both sexes. Moreover, girls in the 2013 generation (for ages 10–13 year) completed more stages than their 2003 male counterparts. Across all generations, children achieved CRF values corresponding to low cardiovascular risk for future health outcomes. Centile values ranged from “low” to “very high” depending on age, sex, and generation of the sample.ConclusionNegative trends in CRF from Slovenian schoolchildren were reversed by 2013, indicating that Slovenia should continue implementing progressive national physical fitness strategies introduced between sampling periods (i.e., 2003–2013). Additionally, due to the universal nature of Slovenian schoolchildren achieving “healthy cut-off values” for 20mSRT (generation-inclusive), it is suggested that more specific cut-off criteria are developed, especially for younger children, and girls, so that future CRF results can be more accurately applied for both clinical and pedagogical users.

Objectives: Determine the temporal trends in cardiorespiratory fitness (CRF) and health risk of Slovenian schoolchildren across a 20-year span, assessed via 20-m shuttle run (20mSRT), including defining centile ranges and possible health risk(s) for each generation. Methods: Nationally representative data from 9,426 healthy schoolchildren (6–14 years old) were used to determine changes in CRF across three generations, in 1993 (n = 3,174), 2003 (n = 3,457) and 2013 (n = 2,795) from a multistage, stratified, decennial study. Results: 20mSRT performance declined ∼2.8% from 1993 to 2003, independent of age or sex of the child. This trend was reversed in 2013, increasing by ∼8.2% across all age groups, for both girls and boys, for a net increase of 5.4%. The magnitude of improvement was similar for both sexes. Moreover, girls in the 2013 generation (for ages 10–13 year) completed more stages than their 2003 male counterparts. Across all generations, children achieved CRF values corresponding to low cardiovascular risk for future health outcomes. Centile values ranged from "low" to "very high" depending on age, sex, and generation of the sample. Conclusion: Negative trends in CRF from Slovenian schoolchildren were reversed by 2013, indicating that Slovenia should continue implementing progressive national physical fitness strategies introduced between sampling periods (i.e., 2003–2013). Additionally, due to the universal nature of Slovenian schoolchildren achieving "healthy cut-off values" for 20mSRT (generation-inclusive), it is suggested that more specific cut-off criteria are developed, especially for younger children, and girls, so that future CRF results can be more accurately applied for both clinical and pedagogical users. [ABSTRACT FROM AUTHOR]

It is not known whether children with Developmental Coordination Disorder (DCD) have lower cardiorespiratory fitness (CRF) than children without the disorder, or whether this relationship varies by age and gender. These issues are examined using a cross-sectional assessment of children 9-14 years of age (N = 549). Participants were screened for DCD using the short form Bruininks-Oseretsky Test of Motor Proficiency (BOTMP-SF). A BOTMP-SF age-adjusted standard score at or below the 10th percentile rank on the BOTMP-SF was required to classify a diagnosis for probable DCD. CRF was determined from each participant's predicted peak-aerobic power using the Léger 20-m shuttle-run test. Children with DCD report lower CRF than children without the disorder and are more likely to be in a high-risk group (≤ 20th percentile in peak VO2). Moreover, 70% of boys with DCD scored at or below the 20th percentile in peak VO2. Further research in a laboratory setting should be conducted to confirm these findings. [ABSTRACT FROM AUTHOR]

Background: Cardiorespiratory fitness (CRF) and physical activity (PA) seem to have positive effects on academic achievement (AA), although in most studies, objective methods of assessment have not been used. Aim: To examine the associations of CRF and PA with AA. Subjects and methods: A sample of 640 youngsters (10–18 years) participated in this cross-sectional study. CRF was estimated with the 20-metre shuttle run test and PA was measured using accelerometers. School grades were used to describe AA using mathematics and native language final grades. The relationship between CRF and PA with AA was analysed using ANCOVA. Results: Results show a significant effect of CRF levels on native language grades, after adjustment for confounders [F(3,414) = 3,99 p 0.05]. No significant effects of PA levels on AA were found. Conclusions: CRF is associated with moderate-to-vigorous PA (MVPA) and higher levels of CRF may influence AA. CRF is positively correlated with MVPA, suggesting that higher amounts of MVPA might improve CRF and indirectly influence AA. Since CRF is dependent on higher intensities of PA, we can suggest a focus on implementing improvement strategies to increase the intensity of physical education lessons.

Changes of direction (CoDs) have a high metabolic and mechanical impact in field and court team sports, but the estimation of the associated workload is still inaccurate. This study aims at validating an algorithm based on kinematic data to estimate the energy cost of running with frequent 180°-CoDs. Twenty-six physically active male subjects (22.4 ± 3.2 years) participated in two sessions: (1) maximum oxygen uptake ( V ̇ O 2 , m a x ) and maximal aerobic speed (MAS) test; (2) 5-m continuous shuttle run (two 5-min trials at 50% and 75% MAS, 6-min recovery). In (2), full-body 3D-kinematics and V ̇ O 2 were simultaneously recorded. Actual cost of shuttle running (C meas ) was obtained from the aerobic, anaerobic alactic and lactic components. The proposed algorithm detects “braking phases”, periods of mostly negative (eccentric) work occurring at concurrent knee flexion and ground contact, and estimates energy cost (C est ) considering negative mechanical work in braking phases, and positive elsewhere. At the speed of, respectively, 1.54 ± 0.17 and 1.90 ± 0.15 m s −1 (rate of perceived exertion: 9.1 ± 1.8 and 15.8 ± 1.9), C meas was 8.06 ± 0.49 and 9.04 ± 0.73 J kg −1  m −1 . C est was more accurate than regression models found in literature (p < 0.01), and not significantly different from C meas (p > 0.05; average error: 8.3%, root-mean-square error: 0.86 J kg −1  m −1 ). The proposed algorithm improved existing techniques based on CoM kinematics, integrating data of ground contacts and joint angles that allowed to separate propulsive from braking phases. This work constitutes the basis to extend the model from the laboratory to the field, providing a reliable measure of training and matches workload. [ABSTRACT FROM AUTHOR]

The purpose of this study was: (a) to develop a new sport-specific, repeated-sprint ability test involving 4 changes of direction, namely, the multiple repeated sprint ability (MRSAB) test for badminton players; (b) to determine its validity by comparing the results of 5 different skill levels; and (c) to assess the link between the new test and neuromuscular lower limb and physiological variables. For this purpose, 42 participants were separated into 5 groups to perform the MRSAB test at the same time of day, on 2 occasions, separated by at least 48 hours. The MRSAB test consisted of 2 repetitions of 4 movements (4 x 3 m) separated by 30 seconds of passive recovery. This pattern was repeated 10 times. The best time (BT), mean time (MT), and fatigue index (FI) were measured. Heart rate and blood lactate concentration were also recorded to determine the participants' physiological responses to the test. The results show that the MRSAB test is valid, because it differentiates between the 5 skill levels for BT, MT and FI and offers a reliable method (intraclass correlation coefficient = 0.95 for BT and MT) for testing badminton players, with no differences between the sessions (p > 0.05). Moreover, the link between MT and neuromuscular variables, such as jump height in squats and countermovements (r = -0.55 and -0.60, respectively) and with ...O2max (r = -0.92) reveals that this test uses a combination of the anaerobic and aerobic systems; thus, it can be used by trainers either to improve movement ability or increase these physical qualities. [ABSTRACT FROM AUTHOR]

Background:Cardiorespiratory fitness (CRF) and physical activity (PA) seem to have positive effects on academic achievement (AA), although in most studies, objective methods of assessment have not been used. Aim:To examine the associations of CRF and PA with AA. Subjects and methods:A sample of 640 youngsters (10–18 years) participated in this cross-sectional study. CRF was estimated with the 20-metre shuttle run test and PA was measured using accelerometers. School grades were used to describe AA using mathematics and native language final grades. The relationship between CRF and PA with AA was analysed using ANCOVA. Results:Results show a significant effect of CRF levels on native language grades, after adjustment for confounders [F(3,414) = 3,99p < 0.05], but not for mathematics [F(3,360) = 0.95p > 0.05]. No significant effects of PA levels on AA were found. Conclusions:CRF is associated with moderate-to-vigorous PA (MVPA) and higher levels of CRF may influence AA. CRF is positively correlated with MVPA, suggesting that higher amounts of MVPA might improve CRF and indirectly influence AA. Since CRF is dependent on higher intensities of PA, we can suggest a focus on implementing improvement strategies to increase the intensity of physical education lessons. [ABSTRACT FROM AUTHOR]

In this article, we present the results of selected parameters of the running speed of young school children. The aim of this research is to determine the dependence of parameters of speed abilities and physical development of 6 - 7 year old children. The sample consisted of 67 probands (42 boys and 25 girls) with a decimal average age of 6.72 ±0.3 year. We used the test 4 x 10m shuttle run with changes of direction for diagnostics of running speeds. We used the test of lower-limbs frequency in 6s to find out the parameters of movement frequency. We established basic somatic parameters: body height, body weight, BMI. All obtained results were compared with each other and evaluated using correlation analysis. We stated that in somatic parameters high statistical dependence was recorded (p < 0.01), which we consider as a natural developmental indicator. In the group of girls, we recorded a slightly shorter contact time with the pad; however, a significantly longer flight time with single stride cycles. In intrasexual comparison, we recorded statistical significant difference in flight time and in stride frequency (p < 0.05). Boys achieved a higher stride frequency and a shorter flight phase, so they also achieved a higher number of step cycles. In the group of boys, we recorded statistical dependence (p < 0.01) between a running speed with changes of direction and stride frequency. [ABSTRACT FROM AUTHOR]

As a special form of transferring the direction of running, shuttle run is a common way in university physical education. In order to optimize the trajectory of a shuttle run, the paper proposes completed trace equivalence of shuttle run motion models. Firstly, it combines Hybrid System theory and shuttle run motion to obtain a definition of shuttle run motion model. Secondly, it determines an equivalence algorithm using algebraic computation. Thirdly, it eliminates some branches of the model by completed trace equivalence to get simplified shuttle run motion model. Finally, a shuttle run motion example is used to prove the validity of the completed trace equivalence. [ABSTRACT FROM AUTHOR]

The purpose of this study is to determine whether there are differences in VO2max during one season in a team of semi-professional football players. This study will also determine the differences between groups, in relation to their position in the team, as well as in relation between the first team and the reserves. This study was conducted on a male football team, between 16 and 28 years of age and with no health problems, competing in a third-tier league. The technique employed is testing and the instrument is the Shuttle Run test that estimated their aerobic capacity. The testing was conducted indirectly during field tests at the beginning of the preparatory period, at the beginning of the competing period and at the end of the season. After a statistical analysis, it can be concluded that there are significant differences between the initial testing, control testing, and final testing. The initial testing was done at the beginning of the preparatory period and the results of the test ranged from 41.50 to 58.10 ml/kg/min. Then after six weeks, which was also right before the start of the competitive part of the season, the control testing was conducted and the results ranged from 46.90 to 62.30 ml/kg/min. Finally, at the end of the season, after all league matches had been played, the final testing was carried out and the results were obtained ranging from 43.80 to 62.00 ml/kg/min. All the testing was conducted on a sample of 31 players, where no relation was discovered between the status of the players at any of the three time points. However, there were some statistically significant differences from the aspect of the players' position but that is due to the goalkeepers being statistically different from the rest of the team. The cause of the differences in the obtained results are differences in intensity, volume and type of training depending on the stage of the season, as well as the specificity of training for the various positions in the team.

This study investigated performance and physiology to understand pacing strategies in elite Paralympic athletes with cerebral palsy ( CP). Six Paralympic athletes with CP and 13 able-bodied ( AB) athletes performed two trials of eight sets of 10 shuttles (total 1600m). One trial was distance-deceived ( DEC, 1000 m + 600 m) one trial was nondeceived ( N- DEC, 1600 m). Time (s), heart rate ( HR, bpm), ratings of perceived exertion ( RPE, units), and electromyography of five bilateral muscles ( EMG) were recorded for each set of both trials. The CP group ran slower than the AB group, and pacing differences were seen in the CP DEC trial, presenting as a flat pacing profile over the trial ( P < 0.05). HR was higher and RPE was lower in the CP group in both trials ( P < 0.05). EMG showed small differences between groups, sides, and trials. The present study provides evidence for a possible pacing strategy underlying exercise performance and fatigue in CP. The results of this study show (1) underperformance of the CP group, and (2) altered pacing strategy utilization in the CP group. We proposed that even at high levels of performance, the residual effects of CP may negatively affect performance through selection of conservative pacing strategies during exercise. [ABSTRACT FROM AUTHOR]

Purpose: Free throws (FT) accuracy is a major determinant of performance in basketball game. However, the effect of exercise intensities on FT accuracy has not been well studied. The aim of the present study was to examine the effect of different exercise intensities on FT accuracy in young male basketball players. Methods: For this aim, 22 basketball players (age 16.12 ± 1.16 years, body mass 76.4 ± 13.3 kg and height 186.4 ± 8.9 cm), classified into 2 age groups (younger 15.28 ± 0.48 years, n = 11; older 16.97 ± 1.00 years, n = 11). The participants performed 50 FT under five conditions (i.e. 10 FT per condition): after rest (A), after 3 min shuttle running with ~9 km h (B), ~9.5 km h (C), ~10 km h (D) and ~10.5 km h (E). Results: The analysis of variance showed a main effect of exercise intensity on FT accuracy ( p = 0.003, η = 0.585), heart rate (HR) ( p < 0.001, η = 0.990) and rate of perceived exertion (RPE) ( p < 0.001, η = 0.703): (a) FT accuracy in the C and D conditions was higher than the A condition ( p ≤ 0.004); (b) all conditions differed for HR ( p ≤ 0.047), the higher was the exercise intensity the higher was the HR, whereas no difference was revealed between D and E conditions; (c) the same trend as in the HR was observed in RPE (i.e. the higher the exercise intensity, the higher the RPE), too, where all conditions differed ( p ≤ 0.047), except between C and D, and between D and E conditions. Conclusions: There was a significant exercise intensity × age interaction for RPE ( p = 0.011, η = 0.516), but not for FT accuracy ( p = 0.336, η = 0.224) or HR ( p = 0.128, η = 0.329). The findings of the present study showed that a minimum of exercise intensity was necessary to achieve peak FT performance and a shape of inverse U was suggested for the relationship between FT accuracy and exercise intensity. [ABSTRACT FROM AUTHOR]

Carbohydrate mouth rinse (CMR) is a novel method proposed to enhance endurance performance lasting ≤ 60 min. The current study examined the influence of CMR on anaerobic performance tasks in 11 collegiate female soccer players after an overnight fast. Athletes completed two experimental sessions, during which carbohydrate (CHO; 6% maltodextrin) or taste- and colour-matched placebo (PLA) mouth-rinse solutions were administered in a counterbalanced, double-blinded design. Three rounds of a 5-min scrimmage bout and series of performance tests including a single countermovement vertical jump (1VJ), a set of four consecutive vertical jumps, a 72-m shuttle run (SR72) and 18-m sprint comprised each trial. Thirst sensation (TS), session TS, ratings of perceived exertion (RPE) and session RPE were assessed as secondary outcomes. The first SR72 approached significance (p = 0.069), but no significant between-trials differences were observed for any of the mean performance tasks. The highest 1VJ scores did not differ for the first (CHO = 47.3 ± 3.4, PLA = 47.7 ± 3.5 cm; p = 0.43), second (CHO = 48.0 ± 4.1, PLA = 47.9 ± 3.5 cm; p = 0.82) or third bout (CHO = 47.4 ± 3.9, PLA = 48.1 ± 3.9 cm; p = 0.26). TS approached significance (p = 0.053) during the first bout. No significant differences (p > 0.05) were found for any of the perceptual variables. Current results fail to support ergogenic influence of CMR on anaerobic performance tasks in collegiate female athletes. [ABSTRACT FROM AUTHOR]

Purpose: Body balance, as one of the coordination abilities, is a desirable variable for basketball players as regards the necessity of efficient responses in constantly changing situations on a basketball court. The aim of this study was to check whether physical activity in the form of running and jumping influences variables characterizing the process of keeping body balance of a basketball player in the standing position. Methods: The research was conducted on 11 young basketball players. The measurements were taken with a Kistler force plate. Apart from commonly registered COP displacements, an additional variable describing the process of keeping body balance by a basketball player was ankle joint stiffness on the basis of which an "Index of Balance-Stiffness" (IB-S) was created. Results: Statistically significant differences were obtained for the maximum COP displacements and ankle joint stiffness between measurements of balance in the standing position before and after the employed movement tasks whereas there were no statistically significant differences for the aforementioned variables describing the process of keeping balance between measurements after running and after jumping. Conclusions: The research results indicate that the employed movement activities brought about significant changes in the process of keeping balance of basketball player in the standing position which, after the run performed, remain on a similar level to the series of jumps being performed. The authors attempted to establish an index based on the stiffness which yields a possibility to perceive each basketball player as an individual person in the process of keeping balance. [ABSTRACT FROM AUTHOR]

There is evidence that appropriately structured sport programmes can help young people to build positive life skills while also improving their physical fitness and psychological well-being. Disadvantaged and marginalised young people have relatively low rates of participation in sport, and designing programmes that attract and retain them presents a major challenge. Some success has been reported for programmes involving boxing, but such programmes entail a high potential for injury. The present study assessed the effects of a modified, low-risk form of boxing, known as Box'Tag®, on disadvantaged 11–12-year-olds. Volunteer Grade 7 students (N = 51) participated in an eight-week programmes of two to three sessions per week. Using a matched-pair design to control for effects of gender and risk of social disengagement (at-risk/not-at-risk), participants were assigned to either the Box'Tag®intervention or a control condition, in the form of a largely non-physical social skills programmes called Rock and Water. To assess aspects of psychological well-being, the Brunel Mood Scale (BRUMS) and the Strengths and Difficulties Questionnaire (SDQ) were administered at baseline (T1), at 4 weeks (T2), at 8 weeks (T3), and a follow-up at 12 weeks (T4). Participants completed a shuttle run and other fitness tests at T1 and T3. Qualitative feedback from participants (n = 36) was gathered via open-ended questions at T3. No significant between-group differences were found for BRUMS or SDQ scores, although both the intervention and control groups reported significant reductions in total difficulties scores from T1 to T2 and the not-at-risk members of the Box'Tag®group reported the most positive trends for total mood disturbance from T1 to T2. The Box'Tag®group showed significant improvement in shuttle run performance from T1 to T3, whereas the control group showed no improvement. Programme perceptions were more positive for Box'Tag®participants than for the control group, and behavioural benefits were found for both programmes. Overall, the Box'Tag®programme appealed to children of both sexes, engaged children at risk of social disengagement, had positive effects on aerobic fitness, and yielded behavioural benefits for some participants. [ABSTRACT FROM PUBLISHER]

Purpose. Although maximal heart rate (HRmax) is used widely to assess exercise intensity in training, there are limited data with regards to the validity of age-based prediction equations of HRmax in volleyball players. Therefore, the aim of the present study was to compare the measured-HRmax of two prediction equations (Fox-HRmax = 220 − age and Tanaka-HRmax = 208 − 0.7 × age) in young female volleyball players. Methods. The study involved 47 volleyball players (age 13.39 ± 2.01 years, body mass 54.0 ± 10.8 kg, height 162.7 ± 10.2 cm) who performed a graded exercise field test (20 m shuttle run endurance test) to assess HRmax. Measured-HRmax values were compared with the Fox and Tanaka prediction equations. Results. The results showed that mean scores for HRmax significantly differed between measured and predicted values (p < 0.001, ŋ2 = 0.49). Post-hoc tests revealed that Fox-HRmax overestimated measured-HRmax (mean difference 5.7 bpm; 95% CI [3.0, 8.5]), whereas Tanaka-HRmax was similar to measured-HRmax (-2.2 bpm; 95% CI [-4.9, 0.4]). HRmax did not correlate with age (r = 0.16, p = 0.291). Conclusions. The results of this study failed to validate the widely used '220−age' formula in volleyball players. Coaches and fitness trainers should take into account that the overestimation of HRmax by the Fox equation might lead to prescribing exercise at a higher intensity than what is targeted. Therefore, the Tanaka equation appears to offer a more accurate prediction equation of HRmax than the Fox equation in young female volleyball players. [ABSTRACT FROM AUTHOR]

The ability to perform fast cutting manoeuvres is essential in soccer and requires sufficient traction between shoe and surface. Artificial turf (AT) surfaces are widely used in soccer and among others turf moisture and shoe studs can influence traction. The aim of this study was to quantify the influence of moisture (DRY and WET AT), for three realistic shoe stud characteristics sets [Turf Field (TF), Artificial Grass (AG) and Firm Ground (FG)], on cutting performance, executed traction and perception of the players. Twelve experienced soccer players performed 10 × 5 m shuttle run tests. Ground reaction forces of the open stance phase of the 180° turns were measured and required traction was calculated. Players' perception was also measured. A two-way 2×3 analysis of variance (ANOVA) Repeated Measures with Bonferroni correction was conducted. On dry AT no performance differences between the three tested shoe stud characteristics sets could be measured. On wet AT the AG and FG designs performed evenly well but when wearing the TF shoe, equipped with 74 short studs, significant surface x shoe interaction effects indicated decreased performance and traction on the wet surface. The experienced players perceived shoe x surface evoked differences in performance and traction very well. [ABSTRACT FROM AUTHOR]

Purpose: To assess the relationship between asthma, body mass index (BMI) and aerobic performance, as indicated by a shuttle test. Methods: 20,577 participants (10,413 boys) from the SportsLinx serial cross-sectional study participated. Parental reports of asthma status and home postcode data were gathered from consent forms. Stature, sitting stature and body mass were measured and BMI, somatic maturity and indices of multiple deprivation scores (IMD) were derived. Performance on the 20 m multi-stage shuttle runs test (20mSRT) was used to estimate cardiorespiratory fitness (CRF). Results: Asthma [ F (1, 17,015) = 82.26, P < 0.01] and gender [ F (1, 17,015) = 678.491, P < 0.001] significantly influenced 20mSRT. The addition of BMI, maturity and IMD to the model did not alter these significant effects. There was a significant interaction between 20mSRT and BMI [ F (1, 16,723) = 132.80, P < 0.01], with a significant decrease in 20mSRT from the 50th BMI percentile upwards [ t (16,699) = 36.88, P < 0.01]. Binary logistic regression revealed gender and 20mSRT to be significant predictors of asthma occurrence; BMI SDS just reached significance whilst maturity and IMD were not significant contributors to the model. Conclusions: This study demonstrates the negative influences of low CRF and high BMI on the risk of asthma occurrence in pre-pubertal children. Furthermore, it highlights the significant influence of BMI on CRF, revealing these effects to be manifest considerably below those BMI percentiles conventionally associated with being overweight or obese. [ABSTRACT FROM AUTHOR]

Sickle cell disease (SCD) and Sickle cell trait (SCT) are genetic disorders characterised by production of abnormal haemoglobin (Hb). It affects many races, countries, and ethnic groups and is particularly prevalent in Africa and parts of Asia. An association linking the presence of SCD in adults with exercise capacity has been established. Several factors might contribute in limiting exercise capacity in this population including; reduced oxygen carrying capacity of blood due to low Hb concentration; structural and functional adaptations resulting from chronic anaemia; and pulmonary changes from repeated episodes of acute chest syndrome (Callahan et. al). However, the mechanism of exercise limitation in children with sickle cell is still not clear. The aim of this study was to assess the cardiovascular response to a 20m shuttle run test of SCD/SCT and compare them to normal children from Oman. Anthropometric and body composition of Omani male children ages 12-15 years were measured. Haematological indices and VO2 max response to exercise was obtained. In 20m shuttle run test normal children reported significantly higher mean values than SCT and SCD children (P<0.05), while SCT results were significantly higher than SCD (P<0.05). In this study children with SCD have significantly lower aerobic fitness level compared with the other two groups. Other similar studies (Pianosi et al; Barden et al) reported same results. This might be due to the severity of the disease and delay in growth patterns. Children with SCD have limited cardiopulmonary fitness in comparison with normal healthy children. [ABSTRACT FROM AUTHOR]

The aims of this study were to explain how the Intermittent Endurance Running (INTER) test is executed, describe physiological responses during testing, and evaluate reliability and content validity in this new soccer specific test. The test consists of 20 m shuttle running, interspersed with straight sprints, agility sprints, walking and resting. Shuttle run speed is increased at each level until exhaustion. Thirteen male professional players participated in the present study. Exercise tolerance time, distance covered, mean blood lactate and mean heart rate were 25:51 ± 2:41 min, 2892 ± 324 m, 5.5 ± 1.2 mmol · L-1 and 161 ± 11 beats · min-1, respectively, during the INTER test. Sprint and agility performance decreased significantly at higher levels. Eight of the players performed a retest for reliability evaluations. Mean difference ± 95% limits of agreement, coefficient of variation (CV) and intraclass correlation coefficient (ICC) for exercise tolerance time between test and retest were -00:41 ± 02:25 min, 2.5% and 0.75, respectively. The CV for sprint and agility performance between test and retest was <1%. The INTER test mimics soccer games on distance/time ratio, frequency of sprints, heart rate and blood lactate values, and could be an alternative field test for evaluating essential physical performance aspects in soccer players. [ABSTRACT FROM AUTHOR]

The aim of this study was to: (1) determine directly the energy cost of shuttle running ( C) and (2) compare it to the values indirectly estimated from kinematic data. C over distances of ≈10 or ≈20 m was determined on 65 subjects (group 1) from gas exchange measurements over 155 trials, or indirectly estimated on 10 subjects (group 2) from the time course of the speed as follows. (1) The cost to accelerate from zero to peak speed was estimated assuming a 25 % efficiency and added to that of constant-speed running, as obtained on subjects of group 1. (2) Since (i) accelerated running on flat terrain is equivalent to running uphill at constant speed, on a slope dictated by the forward acceleration (di Prampero et al. in J Exp Biol 208:2809-2816, ), and (ii) the energy cost of running uphill is known, C was obtained from the time course of the acceleration. C increased with the average speed, at any given speed being significantly greater for the shorter distances; e.g., at ≈4 m/s over 10 m, it amounted to ≈14 J/(kg m), i.e., 3.5-fold larger than that at constant speed. The two indirect methods yielded results not significantly different from C over the longer (≈20 m), but underestimated it over the shorter (≈10 m) distances. From our results, over ≈20 m C can be obtained with sufficient accuracy from actual measurements of peak speed alone, thus, greatly simplifying the experimental procedure. The so-obtained data can then be utilized to assess the athletic status of any subject, as well as to plan appropriate training strategies. [ABSTRACT FROM AUTHOR]

The purpose of the present study was to examine the effects of a strategic self-talk intervention on basketball free throw performance under conditions of physical exertion. Forty-one male basketball players (Mage = 23.19 years) participated in the study. Following a baseline assessment, a 3-week intervention was implemented. During this period participants of the two groups practiced the same number of free throws in their training sessions; participants of the experimental group practiced using self-talk and developed personal free throw self-talk plans. In the final assessment, the participants repeated the free throw test following a typical shuttle run task causing increased physical exertion. The results showed that in the final assessment the self-talk group performed significantly better than the control group. Overall, the findings indicate that self-talk can be an effective strategy for basketball players when performing free throw under conditions of physical exertion, which is a typical situation in basketball games., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Galanis, Hatzigeorgiadis, Charachousi, Latinjak, Comoutos and Theodorakis.)

Abstract: Oxygen consumption at peak physical exertion (VO2 maximum) is the most widely used indicator of cardiorespiratory fitness. The purpose of this study was to compare two protocols for its estimation, cycle ergometer testing and the 20m shuttle run, among children with and without probable developmental coordination disorder (pDCD). The shuttle run test was conducted during regular school hours, usually in the gymnasium. Children were then invited to a lab to complete the cycle ergometer protocol. Children were categorized as possible cases of DCD using the Movement-ABC-2. The analysis was performed using cut-points at both the 5th (n =38) and 15th (n =51) percentiles. The average age of children in the study was 12 years (SD=0.5). Children with pDCD had poorer VO2 maximum when compared to typically developing children based on both the shuttle run and the cycle ergometer. The correlation between tests is in the moderate to high range (r =0.71, p <0.001); 0.78 for girls, and 0.73 for boys. The overall difference in correlations between typically developing children and children with pDCD based on the 15th percentile was 0.12 (p =0.27). For children with pDCD based on the 5th percentile however, the difference between groups was larger (difference in r =0.25), and was statistically significant (p =0.02). In multivariate analyses, there was no difference in the effect of the shuttle run results in predicting VO2 maximum obtained through the cycle ergometer test for children with pDCD compared to those without the condition. Regardless of the test, the patterns of association between children with pDCD and typically developing children were the same reinforcing the findings of previous field-based reports. Moderate to good correlations, at the 15th percentile cut-point, between tests suggests that the shuttle run test is a reliable substitute in this population when lab based assessments of VO2 maximum are not feasible. [Copyright &y& Elsevier]

The article reports on research conducted to examine the effect a seven week unstable and stable resistance training program had on measures of strength, balance, and functional performance. Researchers evaluated 40 athletes. They found that that instability resistance training may be considered as effective as traditional stable resistance training and that it should be incorporated in conjunction with traditional stable training to provide a greater variety of training experiences.

The article reports on the results of research which was conducted to evaluate the running speed and agility performance of professional and amateur soccer players. Researchers evaluated 108 professional players and 79 amateur players. They found that professional soccer players' running speeds and agility performances are higher than amateur soccer players and that all soccer players have the same running speed and agility performance in accordance with their different playing positions.

The article presents a study that examined the immediate and short-term effects of 3- and 10-minute ice bag applications to the hamstrings on functional performance. Participants include 42 athletes who did not suffer allergy to cryotherapy. It was found that the 10-minute ice bag application increased immediate 20-minute post shuttle run time, and reduced immediate postapplication vertical jump performance. It concludes that short-term cryotherapy affected power and functional performance.