Type

Journal Article

Authors

Giuseppe De Vito
Rade Durbaba
Madeleine Lowery
Francesco Budini

Subjects

Pharmacology

Topics
physiology knee humans reaction time electromyography muscle skeletal reference values physiopathology tremor isometric contraction reflex stretch male adult algorithms mental fatigue

Effect of mental fatigue on induced tremor in human knee extensors. (2013)

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.
Collections Ireland -> University College Dublin -> PubMed

Full list of authors on original publication

Giuseppe De Vito, Rade Durbaba, Madeleine Lowery, Francesco Budini

Experts in our system

1
Giuseppe De Vito
University College Dublin
Total Publications: 47
 
2
Madeleine M Lowery
University College Dublin
Total Publications: 71