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Effects of self‐regulatory strength depletion on muscular performance and EMG activation
Author(s) -
Bray Steven R.,
Martin Ginis Kathleen A.,
Hicks Audrey L.,
Woodgate Jennifer
Publication year - 2008
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.2007.00625.x
Subject(s) - isometric exercise , stroop effect , psychology , task (project management) , physical medicine and rehabilitation , cognition , physical strength , physical therapy , medicine , neuroscience , management , economics
The purpose of the present study was to examine the effects of a self‐regulatory strength depletion manipulation on performance of a physical endurance (isometric handgrip) task. In addition, the effect of depletion on EMG activity in the working forearm muscles during the endurance task was explored. Sedentary undergraduates ( N =49) were randomly assigned to either a cognitive depletion condition (modified Stroop task) or a control (color word) group and completed two maximal isometric exercise endurance trials separated by the cognitive task. Participants in the depletion group showed significant ( p <.05) degradations in performance and exhibited higher EMG activation on the second endurance trial ( p <.05) compared to controls. Results are consistent with the limited strength model of self‐regulation and are interpreted in light of the central fatigue hypothesis.