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EFFECTS OF CONCENTRIC AND ECCENTRIC EXERCISE ON MUSCLE FATIGUE

Abstract

Andrew T. Fernandez1 & Andrew C. Graham1. 1University of Central Missouri, Warrensburg, Missouri; e-mail: atf42180@ucmo.edu

Several published studies show that the concentric phase of an exercise will cause greater fatigue, if performed alone, than the eccentric phase. PURPOSE: The purpose of this study was to determine which phase of a bicep curl induced fatigue more quickly. METHODS: Ten college students, ages 18-24, were recruited to perform the concentric and eccentric phases of a bicep curl, separately, at 50% of their one-repetition max, until fatigued. One-repetition maxes were determined for concentric and eccentric phases. RESULTS: The results showed that participants were able to complete more concentric repetitions before fatigue than eccentric repetitions. The average number of concentric repetitions completed before fatigue was 75.33 ± 44.19. The average number of eccentric repetitions completed before fatigue was 50.11 ± 28.07. A paired t-test revealed significant differences between the means (p<0.05). CONCLUSION: The hypothesis that participants would be able to complete more repetitions eccentrically before fatigue was not supported. As a whole, subjects were able to perform more repetitions concentrically than eccentrically.

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