Between-set rest intervals (RIs) may influence accumulated fatigue, work volume, and therefore oxygen uptake (VO2) and energy expenditure (EE) during resistance training. The study investigated the effects of different RIs on VO2 and EE in resistance exercises performed with multiple sets and recruiting large and small-muscle mass. Ten healthy men performed 4 randomized protocols (5 sets of 10 repetitions with 15 repetition maximum workloads in either horizontal leg press [LP] or chest fly [CF] with an RI of 1 and 3 minutes). The VO2 was measured at rest, within sets, and during 90-minute postexercise recovery (excess postexercise oxygen consumption [EPOC]). The EE was estimated from VO2net (total VO2 - rest VO2). The VO2 increased in all protocols, being higher within the exercises and during EPOC in the LP than in the CF regardless of the RI. The 1-minute RI induced higher accumulated VO2 during LP (p < 0.05) but not during CF. The EPOC lasted approximately 40 minutes after LP1, LP3, and CF1, being longer than after CF3 (20 minutes, p < 0.05). Total EE was mainly influenced by muscle mass (p < 0.001) (LP3 = 91.1 ± 13.5 kcal ∼ LP1 = 88.7 ± 18.4 kcal > CF1 = 50.3 ± 14.4 kcal ∼ CF3 = 54.1 ± 12.0 kcal). In conclusion, total VO2 was always higher in LP than in CF. Shortening RI enhanced the accumulated fatigue throughout sets only in LP and increased VO2 in the initial few minutes of EPOC, whereas it did not influence total VO2 and EE in both exercises. Therefore, (a) the role of RI in preventing early fatigue seems to be more important when large-muscle groups are recruited; (b) resistance exercises recruiting large-muscle mass induce higher EE because of a greater EPOC magnitude.

RESUMOO exercício contra-resistência (ECR) pode contribuir para o aumento da taxa metabólica de repouso (TMR). É consenso na literatura que o volume da sessão de ECR pode repercutir em maior gasto calórico e que, após o exercício, o consumo de oxigênio em excesso (EPOC) pode variar de acordo com a característica do programa de exercício. Contudo, ainda não é possível definir qual ou quais variáveis de prescrição têm maior impacto sobre o EPOC em sessões de ECR. O objetivo do estudo foi efetuar uma revisão sistemática sobre os estudos que se propuseram a investigar as relações entre o EPOC e variáveis de treinamento em ECR. Os 17 estudos selecionados foram agrupados por similaridade de tratamento (número de séries, intensidade, intervalos de recuperação, velocidade da contração muscular e ordem dos exercícios). Técnicas de estatística descritiva foram utilizadas na tentativa de estabelecer possíveis tendências nas relações dose-resposta. Posteriormente, os dados foram analisados de forma qualitativa. De todas as variáveis analisadas, o curto intervalo de recuperação e o modo de prescrição no formato em circuito foram aquelas com maior impacto provável sobre a magnitude do EPOC. Quanto às demais variáveis, limitações metodológicas não permitem estabelecer tendências, principalmente no tocante à duração do EPOC. Adicionalmente, constata-se a necessidade de padronização de aspectos importantes para a quantificação do EPOC, como o tempo de observação do após o exercício e a forma de aferição da TMR.Palavras-chave: EPOC, fisiologia do exercício, treinamento de força, aptidão física, saúde. ABSTRACTResistance training (RT) may influence resting metabolic rate (RMR) increase. There is a consensus that the volume of the RT session may produce higher caloric expenditure and that the excess post-exercise oxygen consumption (EPOC) may vary according to the characteristics of the exercise program. However, it is not possible yet to define which prescription variables have greater impact on the EPOC. The aim of the present study was to systematically review the studies that investigated the relationship between EPOC and training variables. A total of 17 studies were selected, being organized according to treatment similarity (number of sets, intensity, rest interval, speed of muscle contraction and exercise order). Descriptive statistical techniques were used to establish possible tendency in dose-response relationships. Subsequently, data were qualitatively analyzed. The available evidence suggested that a short rest interval and the circuit training prescription mode had the greatest impact on the EPOC magnitude. As for the other variables, it was not possible to establish any tendency due to methodological limitations, especially concerning EPOC duration. In addition, it seems to be necessary to standardize important aspects of the EPOC assessing, such as the period of observation after exercise and criteria for measuring RMR. (1) sugeriram que o gasto energético proveniente da realização de exercício físico deveria situar...

Objectives. Resistance training may in�uence the resting metabolic rate (RMR), which is desirable in weight management programs. However, its impact on excess postexercise oxygen consumption (EPOC) is yet to be de�ned. e study evaluated the contribution of resistance training variables to EPOC. Design. Studies published until November 2011 were systematically reviewed. Methods. MEDLINE, LILACS, SCIELO, Science Citation Index, Scopus, SPORTDiscus, and CINAHL databases were consulted. e methodological quality of studies was assessed by the PEDro 10-point scale. A total of 155 participants (54% men) aged between 20 ± 2 and 34 ± 14 years were observed by 16 studies (quality scores ranged from 5 to 7), which were organized according to treatment similarity (number of sets, intensity, rest interval, speed of movement, and exercise order). Results. Training volume seemed to in�uence both EPOC magnitude and duration, whereas workload in�uenced mostly the magnitude. Short rest intervals (<60 s) increased the EPOC magnitude, but not the overall energy expenditure. Conclusion. Resistance training with high intensity and volume, performed with short rest intervals (as in circuit training), probably have greater impact on EPOC. Methodological procedures, particularly time of post-exercise observation and RMR assessment, should be standardized to an appropriate quanti�cation of the actual in�uence of resistance training on EPOC.