Bray Steven R, Martin Ginis Kathleen A, Hicks Audrey L, Woodgate Jennifer
Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada.
Psychophysiology. 2008 Mar;45(2):337-43. doi: 10.1111/j.1469-8986.2007.00625.x. Epub 2007 Nov 7.
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.
本研究的目的是检验自我调节资源损耗操作对身体耐力（等长握力）任务表现的影响。此外，还探究了损耗对耐力任务期间工作前臂肌肉肌电活动的影响。久坐不动的大学生（N = 49）被随机分配到认知损耗组（改良斯特鲁普任务）或对照组（颜色词任务），并在认知任务前后完成两次最大等长运动耐力试验。与对照组相比，损耗组参与者的表现出现显著（p <.05）下降，且在第二次耐力试验中表现出更高的肌电激活水平（p <.05）。研究结果与自我调节的有限资源模型一致，并根据中枢疲劳假说进行了解释。
