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KMID : 1023920160180010011
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Journal of the Korean Academy of Kinesiology
2016 Volume.18 No. 1 p.11 ~ p.18
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Effects of Muscle Contraction Speed on Number of Repetitions, Exercise Duration and Muscle Activation during Push-up Exercise in Men
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Song Sang-Hyup
Lee Ho-Seong
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Abstract
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PURPOSE: The purpose of this study was to examine the effects of muscle contraction speed on number of repetitions, exercise duration and muscle activation during push-up exercise in men.
METHODS: The study employed a randomized, counter-balanced crossover design with two testing sessions that were 3 months apart. Twelve, healthy, male collegiate students were asked to perform two exercises separately, normal-speed push-up (ECC: 1-s, CON: 1-s) and speedy-push-up (maximum speed), until repetition failure of volitional contraction. Outcomes were number of repetitions, exercise duration and muscle activation of the pectoralis major measured through surface electromyography (sEMG) during push-up exercises. The sEMG data were normalized to maximal voluntary isometric contraction (MVIC) and expressed as a percentage (%MVIC) in both ECC phase and CON phase.
RESULTS: Number of repetitions (t=-5.352, p<.001), exercise duration (t=-5.837, p<.001) and muscle activity (t=-4.525, p=.023) were significantly different between two exercise conditions.
CONCLUSIONS: Normal-speed push-up exercise increased exercise duration and muscular activity while, and speedy push-up exercise increased number of repetitions. Further studies are warranted to elucidate associations between muscle adaptation stimulus and muscle contraction speed.
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KEYWORD
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push-up exercise, muscle contraction speed, number of repetitions, exercise duration, muscle activation
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