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Báo cáo y học: "Strength and hypertrophy responses to constant and decreasing rest intervals in trained men using creatine supplementation"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Strength and hypertrophy responses to constant and decreasing rest intervals in trained men using creatine supplementation | Souza-Junior et al. Journal of the International Society of Sports Nutrition 2011 8 17 http www.jissn.eom content 8 1 17 jissn journal of the international lociety of Iporti nutrition RESEARCH ARTICLE Open Access Strength and hypertrophy responses to constant and decreasing rest intervals in trained men using creatine supplementation T6r il m D Qmi I 73- Il irúmr1 2loffra l l A ill2t Hcr ir i3 Rlriritnar4 Pi I oifo5 I Plo lz6 Idcito P jUUZd Junior Jeffrey M Wllldiusuil Richard Bloomer Richard D Leite Steven J Fleck Paulo R Oliveira2 and Roberto Simão5 Abstract Background The purpose of the current study was lo compare strength and hypertrophy responses lo resistance training programs that instituted constant rest intervals CI and decreasing rest intervals DI between sets over the course of eight weeks by trained men who supplemented with creatine monohydrate CR . Methods Twenty-two recreationally trained men were randomly assigned to a CI group n 11 22.3 1 years 77.7 5.4 kg 180 2.2 cm or a DI group n 11 22 2.5 years 75.8 4.9 kg 178.8 3.4 cm . Subjects in both groups supplemented with CR the only dillerence between groups was the rest interval instituted between sets the CI group used 2 minutes rest intervals between sets and exercises for the entire 8-weeks of training while the DI group started with a 2 minute rest interval the lirst two weeks alter which the rest interval between sets was decreased 15 seconds per week i.e. 2 minutes decreasing to 30 seconds between sets . Pre- and post-intervention maximal strength for the free weight back squat and bench press exercises and isokinetic peak torque were assessed for the knee extensors and flexors. Additionally muscle cross-sectional area CSA of the right thigh and upper arm was measured using magnetic resonance imaging. Results Both groups demonstrated significant increases in back squat and bench press maximal strength knee extensor and flexor isokinetic peak torque and upper arm and right thigh CSA from pre- to