The Relationship between Muscle Fatigue and Recovery during Isometric Handgrip Task

Y. Soo, M. Sugi, H. Yokoi, T. Arai, R. Kato, and J. Ota (Japan)

Keywords

Muscle fatigue, muscle recovery, maximal isometric force,handgrip tasks, Biomedical Signal Processing,Biomedical Computing

Abstract

The purpose of this paper is to examine the effect of muscle fatigue to recovery duration during isometric handgrip tasks. Three experiments were conducted at 50% MVC with the contraction time of 10 s, 30 s and 50 s. Every experiment consists of 5 handgrip tasks with different rest interval. The maximal isometric forces during the pre- and post-fatigued were recorded to compute the muscle fatigue developed from each handgrip tasks. Exponential function is used to model the relationship between the muscle recovery and rest interval. The results show a very good agreement, where the coefficient of determination (R2 ) is 0.86, 0.85, and 0.95 for each experiment, respectively. After that, the recovery model is constructed by integrating these results. Again, very good agreement (R2 = 0.94) is achieved using the exponential regression analysis. With this model, the recovery duration can be easily estimated provided that the degree of muscle fatigue is understood.

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