Is repetition failure critical for the development of muscle hypertrophy and strength?

Autor:	Sampson, J. A., Groeller, H.
Předmět:	SKELETAL muscle PHYSIOLOGICAL adaptation ANALYSIS of variance COMPARATIVE studies CONFIDENCE intervals ELBOW ELECTROMYOGRAPHY EVALUATION EXERCISE RANGE of motion of joints KINEMATICS LONGITUDINAL method MAGNETIC resonance imaging MUSCLE strength PROBABILITY theory RESEARCH funding T-test (Statistics) TORQUE REPEATED measures design DATA analysis software MUSCLE fatigue RESISTANCE training ANATOMY
Zdroj:	Scandinavian Journal of Medicine & Science in Sports; Apr2016, Vol. 26 Issue 4, p375-383, 9p
Abstrakt:	This investigation sought to determine the effect of resistance training to failure on functional, structural and neural elbow flexor muscle adaptation. Twenty-eight males completed a 4-week familiarization period and were then counterbalanced on the basis of responsiveness across; non-failure rapid shortening ( RS; rapid concentric, 2 s eccentric), non-failure stretch-shortening ( SSC; rapid concentric, rapid eccentric), and failure control ( C, 2 s concentric, 2 s eccentric), for a 12-week unilateral elbow flexor resistance training regimen, 3 × week using 85% of one repetition maximum (1 RM). 1 RM, maximal voluntary contraction ( MVC), muscle cross-sectional area ( CSA), and muscle activation ( EMGRMS) of the agonist, antagonist, and stabilizer muscles were assessed before and after the 12-week training period. The average number of repetitions per set was significantly lower in RS 4.2 [confidence interval ( CI): 4.2, 4.3] and SSC 4.2 ( CI: 4.2, 4.3) compared with C 6.1 ( CI: 5.8, 6.4). A significant increase in 1 RM (30.5%), MVC (13.3%), CSA (11.4%), and agonist EMGRMS (22.1%) was observed; however, no between-group differences were detected. In contrast, antagonist EMGRMS increased significantly in SSC (40.5%) and C (23.3%), but decreased in RS (13.5%). Similar adaptations across the three resistance training regimen suggest repetition failure is not critical to elicit significant neural and structural changes to skeletal muscle. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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