To compare differences between two different rest interval lengths between sets on the volume completed, muscle damage and muscle soreness during a resistance exercise bout.
Twenty-eight healthy sedentary men (18 ± 1 y old) volunteered to participate in this study and were divided into the 1 min (1RI; n = 14) or 3 min (3RI; n = 14) rest interval length between sets. They were submitted to maximal voluntary isometric contraction strength (MVC) and then performed a resistance exercise protocol constituted for three sets of biceps curl at 40% of MVC with 1 min (1RI group) or 3 min (3RI group) interval length between sets. Each bout was performed to voluntary fatigue and the workout volume completed was calculated. Subjects provided blood samples before each bout, and at 24, and 48 h following exercise to evaluate serum CK activity. Muscle soreness was analyzed through visual analog scale, which was presented to subjects before frst bout, immediately after exercise protocol and at 24, and 48 h following exercise.
The results demonstrated that the subjects with longer rest intervals provide greater workout volume as expected, but there were no differences in serum CK activity and muscle soreness between groups.
Training with highvolume, low-intensity resistance training, exercising with short rest intervals does not appear to present any additional challenge to recovery in untrained subjects.
Renato Evangelista is with the Laboratory of Physiology and Biokinetics, Itaperuna, RJ, Brazil. Rafael Pereira is with the Department of Biological Sciences, Universidade Estadual do Sudoeste da Bahia, Jequié, Bahia, Brazil, and the Department of Biomedical Engineering, Universidade Camilo Castelo Branco, São Paulo, Brazil. Anthony C. Hackney is with the Applied Physiology Laboratory, University of North Carolina at Chapel Hill, Chapel Hill, NC. Marco Machado is with the Laboratory of Physiology and Biokinetics, Iguaçu University, Itaperuna, RJ, Brazil, and the Laboratory of the Human Movement Studies, Fundação Universitária de Itaperuna, Itaperuna, RJ, Brazil.