title: Effect of Different Interset Rest Intervals on Performance of Single and Multijoint Exercises With Near-Maximal Loads.
abstract: 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.
authors.affiliation: 1Nursing and Biosciences Post-Graduation Program (PPgEnfBio), Doctorate of Federal University of State of Rio de Janeiro (UNIRIO), Rio de Janeiro, Brazil;2Biosciences Laboratory of Human Movement (LABIMH), Tiradentes University (UNIT), Aracajú, Brazil;3Kinesiology and Sports Studies Department, Eastern Illinois University, Charleston, Illinois;4School of Physical Education and Sports, Federal University of Rio de Janeiro (EEFD/UFRJ), Rio de Janeiro, Brazil; and5Health Science Center, Catholic University of Petrópolis, Rio de Janeiro, Brazil.
authors.forename: Gilmar W
authors.initials: GW
authors.lastname: Senna
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Willardson
authors.forename: Estevão
authors.initials: E
authors.lastname: Scudese
authors.forename: Roberto
authors.initials: R
authors.lastname: Simão
authors.forename: Cristiano
authors.initials: C
authors.lastname: Queiroz
authors.forename: Raoni
authors.initials: R
authors.lastname: Avelar
authors.forename: Estélio H
authors.initials: EH
authors.lastname: Martin Dantas
mesh_terms: D000328:Adult; D015444:Exercise / Q000502:physiology; D005080:Exercise Test; D006801:Humans; D008297:Male; D055070:Resistance Training / Q000379:methods*; D012146:Rest / Q000502:physiology*; D013997:Time Factors; D014891:Weight Lifting / Q000502:physiology*; D055815:Young Adult