Citation

Morris AJ, Christie AD. Exp. Gerontol. 2020; ePub(ePub): ePub.

Affiliation

Department of Human Physiology, University of Oregon, United States of America; School of Kinesiology, Western University, Canada. Electronic address: achris95@uwo.ca.

Copyright

(Copyright © 2020, Elsevier Publishing)

DOI

10.1016/j.exger.2020.110840

PMID

31935440

Abstract

The purpose of this study was to examine the effect of a mentally fatiguing task on postural responses to unexpected backward perturbations in sixteen young and sixteen older women. Postural responses were characterized by center of pressure (COP) displacement, corrective COP peak velocity, and electromyography (EMG) of the medial gastrocnemius. Older women had slower reaction time (p = .002), longer EMG onset times (p = .03), larger COP displacement (p = .001), and faster COP velocity (p = .02) than younger women overall. However, only young women experienced mental fatigue (slower reaction times; p = .001) and this was accompanied by significantly faster COP velocity during the mental fatigue condition (p = .02) than the control condition. Performance of mental fatigue task, not necessarily the development of mental fatigue, affects neuromuscular activation in young women only, but does not affect the magnitude of postural response to perturbation.

Copyright © 2020. Published by Elsevier Inc.

Language: en

Keywords

Center of pressure displacement; Center of pressure velocity; Electromyography; Women