Effect of Repetition Duration During Resistance Training on Muscle Hypertrophy: A Systematic Review and Meta-Analysis
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Maximizing the hypertrophic response to resistance training (RT) is thought to be best achieved by proper manipulation of exercise program variables including exercise selection, exercise order, length of rest intervals, intensity of maximal load, and training volume. An often overlooked variable that also may impact muscle growth is repetition duration. Duration amounts to the sum total of the concentric, eccentric, and isometric components of a repetition, and is predicated on the tempo at which the repetition is performed.
We conducted a systematic review and meta-analysis to determine whether alterations in repetition duration can amplify the hypertrophic response to RT.
Studies were deemed eligible for inclusion if they met the following criteria: (1) were an experimental trial published in an English-language refereed journal; (2) directly compared different training tempos in dynamic exercise using both concentric and eccentric repetitions; (3) measured morphologic changes via biopsy, imaging, and/or densitometry; (4) had a minimum duration of 6 weeks; (5) carried out training to muscle failure, defined as the inability to complete another concentric repetition while maintaining proper form; and (6) used human subjects who did not have a chronic disease or injury. A total of eight studies were identified that investigated repetition duration in accordance with the criteria outlined.
Results indicate that hypertrophic outcomes are similar when training with repetition durations ranging from 0.5 to 8 s.
From a practical standpoint it would seem that a fairly wide range of repetition durations can be employed if the primary goal is to maximize muscle growth. Findings suggest that training at volitionally very slow durations (>10s per repetition) is inferior from a hypertrophy standpoint, although a lack of controlled studies on the topic makes it difficult to draw definitive conclusions.
KeywordsResistance Training Muscle Hypertrophy Muscle Thickness Repetition Maximum Hypertrophic Response
This study was not funded by an outside source. The authors report no conflicts of interest for this study.
Conflict of interest
- 5.Mookerjee S, Ratamess N. Comparison of strength differences and joint action durations between full and partial range-of-motion bench press exercise. J Strength Cond Res. 1999;13:76–81.Google Scholar
- 15.Cooper H, Hedges L, Valentine J. The handbook of research synthesis and meta-analysis. 2nd ed. New York: Russell Sage Foundation; 2009.Google Scholar
- 17.Hox JJ, de Leeuw ED. Multilevel models for meta-analysis. In: Reise SP, Duan N, editors. Multilevel modeling. Methodological advances, issues, and applications, Mahway: Lawrence Erlbaum Associates; 2003. pp. 90–111.Google Scholar
- 22.Keogh JWL, Wilson GJ, Weatherby RP. A cross-sectional comparison of different resistance training techniques in the bench press. J Strength Cond Res. 1999;13:247–58.Google Scholar
- 25.Young WB, Bilby GE. The effect of voluntary effort to influence speed of contraction on strength, muscular power, and hypertrophy development. J Strength Cond Res. 1993;7(3):172–8.Google Scholar
- 26.Claflin DR, Larkin LM, Cederna PS, et al. Effects of high- and low-velocity resistance training on the contractile properties of skeletal muscle fibers from young and older humans. J Appl Physiol (1985). 2011;111(4):1021–30.Google Scholar
- 29.Shepstone TN, Tang JE, Dallaire S, et al. Short-term high- vs. low-velocity isokinetic lengthening training results in greater hypertrophy of the elbow flexors in young men. J Appl Physiol (1985). 2005;98(5):1768–76.Google Scholar
- 35.Alway SE, MacDougall JD, Sale DG, et al. Functional and structural adaptations in skeletal muscle of trained athletes. J Appl Physiol (1985). 1988;64(3):1114–20.Google Scholar
- 36.Sale DG, MacDougall JD, Alway SE, et al. Voluntary strength and muscle characteristics in untrained men and women and male bodybuilders. J Appl Physiol (1985). 1987;62(5):1786–93.Google Scholar
- 43.Gordon PM, Liu D, Sartor MA, et al. Resistance exercise training influences skeletal muscle immune activation: a microarray analysis. J Appl Physiol (1985). 2012;112(3):443–53.Google Scholar