Effect of mental fatigue on induced tremor in human knee extensors

Budini, Francesco, Lowery, Madeleine, Durbaba, Rade and de Vito, Giuseppe (2014) Effect of mental fatigue on induced tremor in human knee extensors. Journal of Electromyography and Kinesiology, 24 (3). pp. 412-418. ISSN 10506411

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Official URL: http://dx.doi.org/10.1016/j.jelekin.2014.02.003

Abstract

In this study, the effects of mental fatigue on mechanically induced tremor at both a low (3-6Hz) and high (8-12Hz) frequency were investigated. The two distinct tremor frequencies were evoked using two springs of different stiffness, during 20s sustained contractions of the knee extensor muscles at 30% maximum voluntary contraction (MVC) before and after 100min of a mental fatigue task, in 12 healthy (29±3.7years) participants. Mental fatigue resulted in a 6.9% decrease in MVC and in a 9.4% decrease in the amplitude of the agonist muscle EMG during sustained 30% MVC contractions in the induced high frequency only. Following the mental fatigue task, the coefficient of variation and standard deviation of the force signal decreased at 8-12Hz induced tremor by 31.7% and 35.2% respectively, but not at 3-6Hz induced tremor. Similarly, the maximum value and area underneath the peak in the power spectrum of the force signal decreased by 55.5% and 53.1% respectively in the 8-12Hz range only. In conclusion, mental fatigue decreased mechanically induced 8-12Hz tremor and had no effect on induced 3-6Hz tremor. We suggest that the reduction could be attributed to the decreased activation of the agonist muscles.

Item Type: Article
Uncontrolled Keywords: mental fatigue, tremor, stretch reflex, loop gain, spring load
Subjects: A100 Pre-clinical Medicine
B100 Anatomy, Physiology and Pathology
B900 Others in Subjects allied to Medicine
C600 Sports Science
C800 Psychology
Department: Faculties > Health and Life Sciences > Applied Sciences
Depositing User: Rade Durbaba
Date Deposited: 23 May 2014 11:28
Last Modified: 26 Oct 2017 16:47
URI: http://nrl.northumbria.ac.uk/id/eprint/16463

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