Department of Sports Science, College of Education, Zhejiang University, Hangzhou 310058, China.
Sports Department, Hangzhou Normal University Qianjiang College, Hangzhou 310036, China.
J Electromyogr Kinesiol. 2021 Feb;56:102487. doi: 10.1016/j.jelekin.2020.102487. Epub 2020 Nov 7.
This study compared the effect of local and general fatiguing exercise on disturbed and static postural control performances. Surface electromyography and center of pressure signals were respectively recorded during self-initiated perturbation test and static postural stability test from 7 young male subjects. Local fatiguing exercise was performed using intermittent isometric knee extensions at the level of 40% of maximal voluntary torques. General fatiguing exercise was implemented with rowing ergometer at a speed of 200 ± 5 m/min. Results of disturbed postural tests showed no significant change of anticipatory postural adjustment (APAs) organizations in individual muscles following both fatiguing exercises, but observed larger APAs coactivations in trunk and dorsal muscle pairs following local than general fatiguing exercise, and larger compensatory postural adjustments (CPAs) coactivation in dorsal muscle pair after both fatiguing exercises. In addition, the results of static postural tests indicated efficient static postural stability accompanying the down-weighting of visual input and the up-weighting of vestibular/somatosensory component following both fatiguing exercises. These findings evidenced a general compensation in the central nervous system in response to the neuromuscular deficiencies induced by local fatiguing exercise and put forward the function of sensory recalibration in maintaining postural stability under fatigue conditions.
本研究比较了局部和全身疲劳运动对姿势控制性能的干扰和静态影响。在自我启动的扰动测试和静态姿势稳定性测试中，分别从 7 名年轻男性受试者记录表面肌电图和中心压力信号。局部疲劳运动采用 40%最大自主扭矩水平的间歇性等长膝关节伸展进行。全身疲劳运动采用划船测功仪以 200 ± 5 m/min 的速度进行。扰动姿势测试结果表明，两种疲劳运动后，个体肌肉的预期姿势调整（APAs）组织均无明显变化，但局部疲劳运动后，躯干和背部肌肉对 APAs 的协同激活更大，两种疲劳运动后，背部肌肉对补偿性姿势调整（CPAs）的协同激活更大。此外，静态姿势测试的结果表明，在视觉输入权重降低和前庭/躯体感觉分量权重增加的情况下，两种疲劳运动后均能实现有效的静态姿势稳定性。这些发现证明了中枢神经系统在对局部疲劳运动引起的神经肌肉缺陷做出反应时的一般补偿，并提出了在疲劳条件下通过感觉重新校准来维持姿势稳定性的功能。
