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Mitochondria are required for energy production and even give brown adipose tissue (BAT) its characteristic color due to their high iron content and abundance The physiological function and bioenergetic capacity of mitochondria are connected to the structure, folding, and organization of its inner-membrane cristae. During the aging process, mitochondrial dysfunction is observed, and the regulatory balance of mitochondrial dynamics is often disrupted, leading to increased mitochondrial fragmentation in aging cells. Therefore, we hypothesized that the morphological changes in BAT mitochondria and cristae observed across aging would reflect alterations to energy dynamics. We developed a quantitative three-dimensional (3D) electron microscopy approach to map cristae network organization in mouse BAT to test this hypothesis. Using this methodology, we investigated the 3D morphology of mitochondrial cristae in adult (3-month) and aged (2-year) murine BAT tissue via serial block face-scanning electron microscopy (SBF-SEM) and3D reconstruction software for manual segmentation, analysis, and quantification. Upon investigation, we found increases in mitochondrial volume, surface area, and complexity and decreased sphericity in aged BAT. Cristae examination revealed decreased cristae volume, perimeter, and complexity, with cristate appearing more heterogeneous. Overall, these data define the nature of the mitochondrial structure in BAT, showing loss of cristae definition across aging, suggesting alterations in functionality and bioactivity.Graphical AbstractWorkflow overview of serial block facing-scanning electron microscopy (SBF-SEM), data segmentation, and 3D analysis of mitochondria using Amira software in murine BAT.

Introdução: Com o avanço da idade, dentre as modificações nas diversas funcionalidades influenciadas pelo envelhecimento, destacam-se alterações na capacidade funcional e no sistema cardiovascular. Objetivo: Verificar as variáveis cardiovasculares de idosos inseridos em diferentes modalidades fí­sicas. Métodos: 40 idosos, sendo 20 homens e 20 mulheres (68,8 ± 7,0 anos, 77,9 ± 12,6 kg, 1,67 ± 0,09 m e IMC 27,78 ± 4,2 kg/m²), subdivididos em 4 grupos: Grupo Caminhada, Grupo Hidroginástica, Grupo Musculação e Grupo Controle, em que ambos os grupos foram compostos por 5 homens e 5 mulheres. Verificou-se (10 minutos em repouso) a frequência cardí­aca, variabilidade da frequência cardí­aca, pressão arterial sistólica e diastólica, e o duplo produto. Resultados: Nenhuma diferença significativa entre os dados investigados foi encontrada, demonstrando assim um comportamento igualitário das variáveis cardiovasculares entre os grupos, em patamares adequados e aceitáveis. Conclusão: Não verificamos diferenças no repouso, entre os grupos de exercí­cio e em relação ao controle.

Introdução: Os exercícios realizados ao ar livre têm apresentado aumento dos adeptos. Objetivo: Avaliar a utilização do exame pré-participação em corredores de rua. Métodos: Cem sujeitos de ambos os gêneros (18 a 80 anos) responderam um questionário estruturado. Foi utilizada uma estatística descritiva e calculou-se as razões de chance (odds ratio) para os diferentes gêneros (masculino versus feminino) e para os tipos de sistema de saúde (público versus privado). Resultados: Dos entrevistados, 52% foram do sexo feminino. Em relação ao exame pré-participação, 61% não realizaram este procedimento. Os indivíduos que tinham plano de saúde realizaram mais (47,5% do total) a avaliação pré-participação quando comparados com os que não tinham plano de assistência médica (25,6% do total). Em relação ao gênero, 59,6% das mulheres realizaram avaliação pré-participação, enquanto homens apenas 18,8%. Conclusão: A realização do exame pré-participação ainda precisa ser melhor absorvida pelos praticantes de corrida de rua.

A atividade física regular assume um papel primordial na promoção da saúde, qualidade de vida e longevidade da população. Estudos indicam relação significativa entre a prática regular de atividade física e a longevidade entre os idosos. Ademais, sabe-se que o efeito da atividade física pode levar à imunossupressão, quando em excesso, e a uma ativação do sistema imunológico quando controladas as cargas adequadamente, sendo que, durante a pandemia, alguns estudos mostraram a relação de ser fisicamente ativo com condições melhores do sistema imunológico para enfrentamento da COVID-19. Sabemos também que, sendo praticado de forma regular, a prática física pode ser considerada como uma forma única de estresse fisiológico capaz de desencadear adaptações quanto a autofagia seletiva. Em microgravidade (μG) o exercício com resistências elásticas externas ou internas são recomendados para que haja menor comprometimento da densidade mineral óssea. Outrossim, o efeito do exercício no cérebro é único no sentido de melhorar a saúde cerebral e as funções cognitivas através da redução de fatores de risco periféricos para declínio cognitivo além da ação direta através das inúmeras alterações neuroquímicas. Mesmo com todos os benefícios do exercício físico ainda não estando totalmente elucidados, ele tem quebrado barreiras dentro das fronteiras do conhecimento através de inovações significativas, tanto relacionadas a assuntos que dizem respeito ao cotidiano, quanto a nossa nova realidade que se traduz por mudanças decorrentes das modificações sociais e comportamentais acarretadas pela pandemia do COVID-19.

Miranda, H, de Souza, JAAA, Scudese, E, Paz, GA, Salerno, VP, Vigário, PdS, and Willardson, JM. Acute hormone responses subsequent to agonist-antagonist paired set vs. traditional straight set resistance training. J Strength Cond Res 34(6): 1591-1599, 2020-The purpose of this study was to compare acute hormone responses and rating of perceived exertion (OMNI-Res) subsequent to the agonist-antagonist paired set (PS) vs. the traditional straight set (TS) resistance training method. Twelve recreationally trained men (25.7 ± 4.7 years, 173 ± 6.3 cm and 71.5 ± 6.6 kg) participated in the current study. After 10 repetition maximum (RM) load determination, each subject performed the following 2 experimental sessions in random order: TS session-3 sets of 10 repetitions at 85% of 10RM for the machine seated row and barbell bench press with 2-minute rest intervals between sets; and PS-3 sets of 10 repetitions with 85% of 10RM alternating machine seated row and barbell bench press for the total of 6 PSs with 2-minute rest intervals between sets. Total testosterone (TT), free testosterone (FT), cortisol, TT/cortisol ratio, growth hormone (GH), and blood lactate concentrations were measured before workout and immediately after workout and 15 and 30 minutes after workout. The OMNI-RES was recorded at the end of each set for both exercises within each session. Under the TS session, TT significantly increased immediately post-workout vs. the pre-workout time point. For the PS session, TT significantly decreased at 30-minute post-workout vs. the immediate post-workout time point, whereas, FT significantly increased immediately post-workout and 15-minute post-workout vs. the pre-workout time point. For the TS session, GH significantly increased immediately post-workout, and at the 15- and 30-minute post-workout time points vs. the pre-workout time point, respectively. For the PS session, GH was significantly increased immediately post-workout vs. the pre-workout time point. Blood lactate significantly increased at all post-workout time points vs. the pre-workout time point under both sessions. The cortisol and TT/cortisol ratio showed no differences between sessions. In conclusion, from an acute standpoint, the TS approach showed a tendency to cause greater disruption in hormone levels, despite the lack of significant differences vs. the PS approach at all time points. However, both strategies may promote similar acute hormone responses.

ObjectivesThe aim of the manuscript was to analyze the effects of two rest periods between volume-equated resistance exercise (RE) on inflammatory responses (cytokines and leukocyte) and muscle damage.MethodsTen trained men (26.40 ± 4.73 years, 80.71 ± 8.95 kg, and 176.03 ± 6.11 cm) voluntarily participated in training sessions consisting of five sets of 10 reps performed at 10-RM on (1) the barbell bench press followed by (2) leg press, with either 1- or 3-min rest between sets and exercises. Circulating concentrations of different biomarkers was measured before (Pre), and after 3 h (excepted for cytokines), 6, 12, and 24 h from exercise. The rate of perceived exertion (RPE) was recorded after each set on both planned visits.ResultsWe found greater increases triggered by the 1-min rest period in Creatine Kinase (CK), occurring from 12 to 24 h post-exercise compared to the 3-min rest condition. A significant increase in the 1-min rest condition was also observed in the total number of leukocytes, neutrophils, and monocytes. The 1-min rest period also triggered increases compared to baseline in pro-inflammatory cytokines [Interleukin 1 beta (IL-1β), p = 0.004; tumor necrosis factor α (TNF-α), p = 0.01; and granulocyte-macrophage colony-stimulating factor (GM-CSF), p = 0.01], which were more evident after 6 and 12 h post-exercise. Similarly, increases in anti-inflammatory cytokines [Interleukin 5 (IL-5), p = 0.01; Interleukin 6 (IL-6), p = 0.01; and Interleukin 10 (IL-10), p = 0.01] at all time-points were observed.ConclusionOur results indicate that a 1-min rest condition in volume-equated RE promoted greater overall muscle tissue damage with a longer duration of the inflammatory processes compared to a 3-min rest.

Introduction Physical exercise has been recommended as a non-pharmacological strategy for preventing and controlling hypertension. Objective To verify chronic cardiovascular and muscle strength adaptations in hypertensive women who underwent 12 weeks of concurrent training (CT) in different orders. Methods Twenty hypertensive women were randomly assigned into 2 groups: resistance exercise-endurance group (REE; 56.00 ± 5.20 years; 78.95 ± 8.28 kg; 155.10 ± 5.30 cm; 33.00 ± 5.30 kg.m-2) and endurance-resistance exercise group (ERE; 57.10 ± 13.38 years; 76.56 ± 18.87 kg; 155.50 ± 8.18 cm; 31.41 ± 5.84 kg.m-2). The endurance exercise was composed of 3 sets of 4 exercises, with 8-RM loads with a 90-second break between sets and exercises. The resistance exercise lasted for 25 minutes and was of progressive intensity. Muscle strength (8-RM), systolic and diastolic blood pressure, heart rate, and double product were assessed pre- and post-exercise. Results The ANOVA showed significant increases in strength for all exercises (p

Basal protein turnover, which largely relies on the degradation of ubiquitinated substrates, is instrumental for maintenance of muscle mass and function. However, the regulation of ubiquitinated protein degradation in healthy, nonatrophying skeletal muscle is still evolving, and potential tissue-specific modulators remain unknown. Using an unbiased expression analysis of 34 putative autophagy genes across mouse tissues, we identified unc-51 like autophagy activating kinase (Ulk)2, a homolog of the yeast autophagy related protein 1, as particularly enriched in skeletal muscle. Subsequent experiments revealed accumulations of insoluble ubiquitinated protein aggregates associated with the adaptors sequestosome 1 (SQSTM1, also known as p62) and next to breast cancer type 1 susceptibility protein gene 1 protein (NBR1) in adult muscles with ULK2 deficiency. ULK2 deficiency also led to impaired muscle force and caused myofiber atrophy and degeneration. These features were not observed in muscles with deficiency of the ULK2 paralog, ULK1. Furthermore, short-term ULK2 deficiency did not impair autophagy initiation, autophagosome to lysosome fusion, or protease activities of the lysosome and proteasome. Altogether, our results indicate that skeletal muscle ULK2 has a unique role in basal selective protein degradation by stimulating the recognition and proteolytic sequestration of insoluble ubiquitinated protein aggregates associated with p62 and NBR1. These findings have potential implications for conditions of poor protein homeostasis in muscles as observed in several myopathies and aging.-Fuqua, J. D., Mere, C. P., Kronemberger, A., Blomme, J., Bae, D., Turner, K. D., Harris, M. P., Scudese, E., Edwards, M., Ebert, S. M., de Sousa, L. G. O., Bodine, S. C., Yang, L., Adams, C. M., Lira, V. A. ULK2 is essential for degradation of ubiquitinated protein aggregates and homeostasis in skeletal muscle.

Aim: The aim was to evaluate the effect of sodium bicarbonate supplementation (NaHCO3) in repetition performance, perceived exertion and blood lactate concentration. Methods: Fourteen trained men (25.14 ± 3.5 years; 85.83 ± 10.18 kg; 1.78 ± 0.06 m; 26.88 ± 3.17 kg/m2) realized two upper-body resistance exercise sessions consisting of 15-RM load and 1 minute of the interval, combining bicarbonate supplementation (BS) or Placebo conditions. Results: After the ANOVA analysis, no difference was found on the total number of repetitions during the session on both BS and Placebo condition (p = 0.11). However, a greater number of total of repetitions on the machine chest fly exercise for BS vs. Placebo condition (p = 0.04) was observed. The perceived exertion increased regardless of the supplementation condition (p < 0.0001). Additionally, for the blood lactate was observed significant increases in BS vs. Placebo condition in the post verification (p = 0.013), corroborated for a bigger area under the curve (AUC) on the BS compared to Placebo (p = 0.026) condition. Conclusion: In conclusion, sodium bicarbonate supplementation was not able to improve performance during a resistance exercise session, except for the single-joint exercise performed with high values of perceived exertion, not altering the perceived exertion, and blood lactate between protocols.

The aim of this study was to verify the post-exercise hypotension phenomenon on two distinct somatotype. For this purpose, twenty-four normotensive trained men (23.2 ± 2.91 years; 73.78 ± 4.53 kg; 177.16 ± 5.73 cm; 23.58 ± 2.18 kg/m2) were divided into two groups (mesomorph and ectomorph). All subjects performed two 10-repetition maximum load test sessions (test and retest) for a whole-body workout routine of resistance exercises. After the load tests, subjects performed sessions structured for 3 sets of each exercise with loads of 85% of 10-repetition maximum loads with 2-min of rest between sets of exercises. The two-way ANOVA showed the same reduction pattern (p = 0.001) in post-exercise systolic blood pressure for both groups. Additionally, a prolonged reduction was observed only on the systolic blood pressure of the mesomorph group following the 10-min (Δ = 13.41%; ESs = 2.08) up to 60-min post-exercise (Δ = 5.64%; ESs = 0.89). However, the same kinetics were not observed in the ectomorph group, the reduction was found only at the 10-min post-exercise time point (Δ = 5.55%; ESs = 1.12). On the other hand, no significant differences were found between groups for any diastolic blood pressure post-exercise time points. In conclusion, our data suggest that regardless the somatotype (mesomorph or ectomorph) a similar post-exercise hypotension phenomenon for systolic blood pressure was observed. However, it is important to highlight that those individuals classified as mesomorphs remained with a reduced systolic blood pressure about 60 minutes after performing exercise, which did not occurred in the ectomorph group.

Objetivo: Quantificar as internações por condições sensíveis à atenção primária (ICSAP), comparando-as com a taxa bruta de internações e analisar sua frequência junto à cobertura do Programa Saúde da Família (PSF) em Petrópolis-RJ. Métodos: Após consulta no SIH-SUS, obteve-se a taxa bruta de ICSAP entre 1999-2013. Foi estabelecida a razão entre a soma destas internações e o número de residentes no município, multiplicado por mil. O coeficiente de correlação de Pearson foi utilizado para a análise de correlação entre as variáveis. Resultados: Houve redução de 54,4% nas ICSAP no período estudado. Observamos uma redução das CSAP sobre o total de internações de 19,9%, para 16,5%. A redução na taxa de ICSAP apresentou forte correlação com o aumento da cobertura do PSF. Conclusão: As mudanças ocorridas são significativas e estimulam o aprofundamento do estudo da eficácia das estratégias como o PSF sobre a redução das ICSAP em diferentes municípios. Descritores: Saúde Pública; Atenção Primária à Saúde; Estratégia Saúde da Família; Planos e Programas de Saúde; Avaliação de Programas e Projetos de Saúde; Hospitalização.

O objetivo do estudo foi avaliar a prevalência de excesso de peso em uma escola municipal da cidade de Petrópolis (RJ) e comparar a força e a flexibilidade entre adolescentes com e sem excesso de peso. Foi composta de 367 adolescentes com idade compreendida entre 11 e 15 anos (13,25 ± 1,49 anos; 51,06 ± 12,36 kg; 155,15 ± 0,10 cm) cursando o segundo segmento do ensino fundamental da escola municipal Jamil Sabrá. Para avaliação da força e resistência abdominal aplicou-se o teste de abdominais em um minuto e para a avaliação da flexibilidade realizou o teste de sentar e alcançar. Resumidamente, a prevalência de excesso de peso (sobrepeso e obesidade) foi de 30,2%. Os estudantes com excesso de peso apresentaram resultado significativamente inferior no teste de resistência abdominal (p = 0,003), e não houve diferença significativa no teste de flexibilidade (p = 0,92). Em conclusão, o estudo apresentou uma prevalência de 30,2%, e adicionalmente os estudantes com excesso de peso apresentaram resultado significativamente inferior no teste de resistência abdominal, contudo não houve diferença significativa no teste de flexibilidade.

The purpose of this study was to examine the acute effects of multi- to single-joint or the reverse exercise order on repetition performance and perceived exertion for the pectoralis major. Fourteen trained men (24.05 ± 4.17 yrs, 78.85 ± 3.51 kg, 175.42 ± 4.01 cm) underwent two different training sequences (SEQ1 and SEQ2). In SEQ1, all subjects performed 5 sets for maximal repetitions, with a 2-min rest interval, of the bench press followed by the machine chest fly with 10 repetitions maximum load. In SEQ2, the same procedures were repeated, but with the reverse order. The t-test did not show any differences (p = 0.140) in total workout repetitions between SEQ1 (62.22 ± 11.00 repetitions) and SEQ2 (55.40 ± 8.51 repetitions). Conversely, the total repetition number for the bench press exercise was significantly greater (p = 0.001) following SEQ1 (34.36 ± 4.68 repetitions) compared to SEQ2 (25.85 ± 6.73 repetitions). In contrast, the total repetition number for the machine chest fly exercise following SEQ2 was significantly greater (p = 0.001) (33.50 + 4.11 repetitions) compared to SEQ1 (27.85 ± 6.52 repetitions). Despite no significant differences found for the rating of perceived exertion (RPE) values between SEQ1 and SEQ2 for the barbell bench press in all sets (p ≥ 0.083), significantly higher RPE values for the machine chest fly were observed over the first three sets following SEQ1 compared to SEQ2 (p < 0.01). In conclusion, the total workout repetitions were not significantly different when performing the traditional multi- to single-joint or the reverse exercise order when training the pectoralis major muscle.

The purpose of this study was to examine the influence of rest period duration (1 vs. 3 minute between sets) on acute hormone responses to a high-intensity and equal volume bench press workout. Ten resistance-trained men (25.2 ± 5.6 years; 78.2 ± 5.7 kg; 176.7 ± 5.4 cm; bench press relative strength: 1.3 ± 0.1 kg per kilogram of body mass) performed 2 bench press workouts separated by 1 week. Each workout consisted of 5 sets of 3 repetitions performed at 85% of 1 repetition maximum, with either 1- or 3-minute rest between sets. Circulating concentrations of total testosterone (TT), free testosterone (FT), cortisol (C), testosterone/cortisol ratio (TT/C), and growth hormone (GH) were measured at preworkout (PRE), and immediately (T0), 15 minutes (T15), and 30 minutes (T30) postworkout. Rating of perceived exertion was recorded before and after each set. For TT, both rest lengths enhanced all postexercise verifications (T0, T15, and T30) compared with PRE, with 1 minute showing decreases on T15 and T30 compared with T0. For FT, both 1- and 3-minute rest protocols triggered augmentations on distinct postexercise moments (T0 and T15 for 1 minute; T15 and T30 for 3-minute) compared with PRE. The C values did not change throughout any postexercise verification for either rests. The TT/C ratio was significantly elevated for both rests in all postexercise moments compared with PRE. Finally, GH values did not change for both rest lengths. In conclusion, although both short and long rest periods enhanced acute testosterone values, the longer rest promoted a long-lasting elevation for both TT and FT.

The aim of this study was to investigate the acute effects of different interset rest intervals on performance of single- and multijoint exercises with near-maximal loads. Fifteen trained men (26.40 ± 4.94 years, 79.00 ± 7.10 kg, 176.6 ± 6.06 cm, 11.80 ± 2.47% body fat, and bench press relative strength: 1.26 ± 0.19 kg·kg of body mass) performed eight sessions (2 exercises × 4 interset rest intervals); each consisting of 5 sets with a 3RM load. The exercises tested were the machine chest fly (MCF) for the single-joint exercise and the barbell bench press (BP) for the multi-joint exercise with 1, 2, 3, and 5 minutes of rest between sets. The results indicated that for the MCF, significantly higher total number of repetitions were completed for the 2- (12.60 ± 2.35 reps; p = 0.027), 3- (13.66 ± 1.84 reps; p = 0.001), and 5-minute (12.93 ± 2.25 reps; p = 0.001) vs. the 1-minute (10.33 ± 2.60 reps) protocol. For the BP, a significantly higher total number of repetitions were completed for 3- (11.66 ± 2.79 reps; p = 0.002) and 5-minute (12.93 ± 2.25 reps; p = 0.001) vs. the 1-minute protocol (7.60 ± 3.52 reps). In addition, subjects completed significantly higher total number of repetitions for the 5-minute (12.93 ± 2.25 reps; p = 0.016) vs. 2-minute (9.53 ± 3.11 reps) protocol. Both exercises presented similar and progressive reductions in repetition performance for all rest protocols along the 5 sets, starting as soon as the second set for the shorter 1-minute rest protocol. In conclusion, to maintain the best consistency in repetition performance, rest intervals of 2 minutes between sets are sufficient for the MCF and 3-5 minutes for the BP. Thus, it appears that longer acute recovery time is needed for a multijoint (core) exercise such as the BP vs. a single-joint (assistance) exercise such as the MCF.

Issues regarding the human aging process have become the focus of discussions and investigations around the world. Inevitably, this process is associated with physiological changes such as modifications in body composition that are related to progressive declines in the biological function as well as the presence of chronic and locomotor impairment conditions...

Objective: The purpose of this investigation was to compare different rest period lengths between consecutive one maximum repetition bench press attempts on performance and ratings of perceived exertion. Method: Eighteen trained men (27.95 ± 4.25 years; 81.00 ± 9.21 kg; 174.62 ± 3.34 cm; bench press relative strength 1.33 ± 0.11 kg/kg of body mass) participated in three randomly ordered sessions that required two consecutive one maximum repetition bench press attempts with 20, 40, or 60-s rest between attempts. Results: The Cochran Q analysis showed no significant differences in the ability to successfully perform a second one maximum repetition attempt with 20, 40, or 60-s rest between attempts (p = 0.882). Specifically, no significant differences were found in the successful completion of the first and second attempts for the 20-s (p = 0.317), 40-s (p = 0.083), and 60-s (p = 0.157) trials, respectively. Briefly, for both 20 and 60-s rest conditions Δ% = 88.88% of subjects successfully performed the second attempt and, for the 40-s protocol, only Δ% = 83.33% completed. For the pre and post-set ratings of perceived exertion, the shorter rest period (20-s) promoted significantly higher values compared to the longer rest periods (pre-set ratings of perceived exertion, p = 0.04; post-set ratings of perceived exertion, p = 0.023). Conclusions: The results of this study can be applied to recreationally trained individuals with the intent of generating a time-efficient process for conducting a valid and reliable one maximum repetition bench press assessment.

ResumoObjetivoVerificar os valores do teste de uma repetição máxima nos exercícios multi e monoarticulares, com e sem privação visual.MétodoDoze homens treinados (23.00±4.80 anos; 80.76±8.09kg; 1.76±0.05cm) realizaram 4 visitas (2 para cada exercício) constando de testes de uma repetição máxima para exercícios multi (agachamento na barra guiada) e monoarticulares (rosca bíceps), com ou sem privação visual.ResultadosO teste T não verificou diferenças importantes entre os métodos de privação visual para o exercício multiarticular, tanto para a força absoluta (Δ%=‐ 6.13%; p=0.422), quanto para a força relativa (p=0.397). O mesmo ocorreu para o exercício monoarticular, tanto para a força absoluta (Δ%=1.43%; p=0.220), como para a relativa (p=0.230). Adicionalmente, um pequeno tamanho do efeito foi verificado entre os testes de uma repetição máxima nos exercícios multi e monoarticulares, nos protocolos com e sem privação visual.ConclusãoDe acordo com os resultados do estudo, podemos concluir que, para os exercícios multi e monoarticulares, o método de privação visual não promove diferenças importantes no deslocamento de cargas na execução do teste de uma repetição máxima.AbstractObjectiveThe aim of the study was to determine values of the 1RM test in multi and single‐joint exercises with and without visual deprivation.MethodTwelve trained men (23.00±4.80 years; 80.76±8.09kg; 1.76±0.05cm) performed four visits (two for each exercise) consisting in 1RM tests for multi‐joint exercise (guided bar squat) and single‐joint exercise (biceps curl), with or without visual deprivation.ResultsThe T test found no significant differences between the visual deprivation methods for multi‐joint exercise both in absolute strength (Δ%=‐ 6.13%; p=0.422) as for relative strength (p=0.397). The same occurred for the single‐joint exercise for absolute strength (Δ%=1.43%; p=0.220) and for relative strength (p=0.230). Additionally, a small effect size was observed between 1RM tests in multi and single‐joint exercises in both visual protocols.ConclusionAccording to the study results, we can conclude that for multi and single‐joint exercises protocol visual deprivation do not cause significant differences in the displacement of loads in 1RM test execution.

The aim of this study was to investigate the impact of different periodization models on strength and local muscle endurance. Twenty trained men (25.45 ± 2.984 years, 75.34 ± 6.05 kg, 177.25 ± 4.92 cm, 23.96 ± 1.64 kg . m-2) were randomly assigned in two groups: undulling periodization (UPG) and traditional periodization group (TPG), respectively. All the subjects performed one repetition maximum (1-RM) strength test and a local muscle endurance test (60% of 1-RM to failure) before, during and after experimental period. The UPG executed 30 workout sessions with daily modifications regarding intensity, volume and rest period length. The TGP was divided into 3 phases (10 workout sessions in each phase) with the same changes executed by the other group in distinct methodological variables (intensity, volume and rest period length). After the ANCOVA analysis, no significant differences were found in both maximum strength attempts, bench press (p = 0.878) and triceps pull-down (p = 0.967). The same results occurred for local muscular endurance on the bench press (p = 0.777) or triceps pull-down (p = 0.494). However, the effect size presented moderate post-test strength gains (ESs = 0,352) and local muscular endurance (ESs = 0.367). Our results indicated that daily undulling periodization seems to be more influent in increasing muscular strength and local muscular endurance according to effect size evidence.

The aim of the study was to compare the effect of three distinct rest period lengths between sets of upper body single-joint exercise with different load zones and volume designed for either endurance or hypertrophy (50% or 80% of 1-RM). Sixteen trained men (20.75 ± 2.54 years; 76.35 ± 5.03 kg; 176.75 ± 3.33 cm, 24.53 ± 1.47 kg/m2) performed a test and retest of 1-RM on non-consecutive days. Forty-eight hours after load testing, the participants were randomly assigned to six sessions consisting of four sets of the triceps pull-down, combining different intensities with distinct rest periods between sets. The shorter 1 minute rest promoted a significant reduction in the total repetition number compared to 3 minute rest for both workloads. There was a difference between 3 and 5 minute conditions for the 50% of 1-RM that did not occur for the 80% of 1-RM condition. Both intensities presented significant interaction values for the rest conditions vs. each set (50% p = 0.0001; 80% p = 0.0001). Additionally, significant values were found for the main effect of the performance of subsequent sets (50% p = 0.003; 80% p = 0.001) and rest conditions (50% p = 0.0001; 80% p = 0.0001). In conclusion, for heavier loads (80%) to fatigue, longer rest of 3 to 5 minutes seems to allow for better recovery between sets and thus, promotes a greater volume. However, when training with lighter loads (50%), the magnitude of the rest seems to directly affect the performance of subsequent sets, and also presents a correlation with total volume achieved for the upper body single-joint exercise scheme.

The purpose of this study was to compare repetition performance and rating of perceived exertion (RPE) with 1-, 3-, or 5-minute rest intervals between sets of multi and single-joint resistance exercises. Fifteen resistance trained men (23.6 ± 2.64 years, 76.46 ± 7.53 kg, 177 ± 6.98 cm, bench press [BP] relative strength: 1.53 ± 0.25 kg·kg(-1) body mass) completed 12 sessions (4 exercises × 3 rest intervals), with each session involving 5 sets with 10 repetition maximum loads for the free weight BP, machine leg press (LP), machine chest fly (MCF), and machine leg extension (LE) exercises with 1-, 3-, 5-minute rest intervals between sets. The results indicated significantly greater BP repetitions with 3 or 5 minutes vs. 1 minute between sets (p ≤ 0.05); no significant difference was evident between the 3- and 5-minute rest conditions. For the other exercises (i.e., LP, MCF, and LE), significant differences were evident between all rest conditions (1 < 3 < 5; p ≤ 0.05). For all exercises, consistent declines in repetition performance (relative to the first set) were observed for all rest conditions, starting with the second set for the 1-minute condition and the third set for the 3- and 5-minute conditions. Furthermore, significant increases in RPE were evident over successive sets for both the multi and single-joint exercises, with significantly greater values for the 1-minute condition. In conclusion, both multi and single-joint exercises exhibited similar repetition performance patterns and RPE, independent of the rest interval length between sets.

The purpose of this study was to compare different rest intervals between sets on repetition consistency and ratings of perceived exertion (RPE) during consecutive bench press sets with an absolute 3RM (3 repetition maximum) load. Sixteen trained men (23.75 ± 4.21 years; 74.63 ± 5.36 kg; 175 ± 4.64 cm; bench press relative strength: 1.44 ± 0.19 kg/kg of body mass) attended 4 randomly ordered sessions during which 5 consecutive sets of the bench press were performed with an absolute 3RM load and 1, 2, 3, or 5 minutes of rest interval between sets. The results indicated that significantly greater bench press repetitions were completed with 2, 3, and 5 minutes vs. 1-minute rest between sets (p