Impact of mental fatigue on self-paced exercise

Brownsberger, J., Edwards, A., Crowther, R., and Cottrell, D. (2013) Impact of mental fatigue on self-paced exercise. International Journal of Sports Medicine, 34 (12). pp. 1029-1036.

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Abstract

The purpose of this study was to examine whether mental fatigue influences the perceived effort required to complete fairly light and hard effort self-paced exercise challenges. Twelve participants completed two trials in a randomised cross-over design. Each participant was required to complete a time-matched pre-exercise task: 1) a continuous cognitive activity test (EXP condition; n=12), or 2) a time-matched passive neutral observation task (CON condition; n=12). Following the pre-exercise task, participants performed two consecutive bouts of self-paced cycling exercise again in randomized order at fairly light (RPE 11) and hard (RPE 15) effort. Physiological, psychological and EEG indices were measured throughout both conditions. EXP participants reported significantly greater sensations of fatigue (p<.01) and demonstrated greater EEG beta-band activation compared with CON (p<.01) prior to exercise. Power outputs from the exercise bouts were significantly reduced for EXP in both self-paced: RPE 11 (83 ±7 vs. 99 ±7 W; p<.01) and RPE 15 (132 ±9 vs. 143 ±8 W; p<.05) trials. This study demonstrates that individuals with higher self-reported sensations of fatigue and elevations of EEG beta activity in the prefrontal cortex of the brain prior to exercise produce less work during self-paced exercise trials than in a control condition, probably due to an altered perception of effort.

Item ID: 26007
Item Type: Article (Research - C1)
ISSN: 1439-3964
Keywords: mental fatigue, effort perception, brain regulation, pacing, EEG
Date Deposited: 18 Jun 2013 02:02
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1106 Human Movement and Sports Science > 110602 Exercise Physiology @ 60%
17 PSYCHOLOGY AND COGNITIVE SCIENCES > 1701 Psychology > 170114 Sport and Exercise Psychology @ 40%
SEO Codes: 92 HEALTH > 9299 Other Health > 929999 Health not elsewhere classified @ 60%
97 EXPANDING KNOWLEDGE > 970117 Expanding Knowledge in Psychology and Cognitive Sciences @ 40%
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