School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, Ottawa, Canada.
J Neuroeng Rehabil. 2012 Jun 14;9:39. doi: 10.1186/1743-0003-9-39.
Fatiguing exercises used across studies to induce alterations in postural control are diverse and may explain the different findings reported. This study aimed to compare the effects of two types of fatiguing plantarflexion exercises on postural control on a firm and a compliant surface. Ten healthy young men (29 ± 4 years) were asked to stand as steadily as possible for 30 s, blindfolded with feet together, on a firm and a compliant surface before and immediately after an isometric and an isokinetic fatiguing exercise.
Maximal force reduction due to fatigue was found significant but similar between exercises. No significant difference was found between the fatiguing exercises on all Center of Pressure (CoP) parameters. Both fatiguing exercises induced increases in CoP excursion area, CoP variability and CoP velocity in both planes (antero-posterior, mediolateral) on the compliant surface. On the firm surface, both fatiguing exercises only induced increases in CoP variability and CoP velocity in the fatigued plane (antero-posterior).
Isometric and isokinetic fatiguing exercises, when producing a similar level of force reduction, induce similar decreases in postural control. The effects of fatigue on postural control in healthy young men are more pronounced when standing on a compliant surface, i.e. when proprioceptive information at the ankle is altered.
在研究中用于诱导姿势控制改变的疲劳运动多种多样，这可能解释了报告的不同结果。本研究旨在比较两种类型的疲劳跖屈运动对在刚性和顺应性表面上的姿势控制的影响。10 名健康年轻男性（29 ± 4 岁）被要求在闭眼且双脚并拢的情况下尽可能稳定地站立 30 秒，分别在进行等长和等速疲劳运动之前和之后在刚性和顺应性表面上进行。
由于疲劳导致的最大力减少被发现具有显著差异，但两种运动之间相似。两种疲劳运动在所有压力中心（CoP）参数上均无差异。两种疲劳运动均在顺应性表面上引起 CoP 偏移面积、CoP 变异性和 CoP 速度在两个平面（前后、左右）上的增加。在刚性表面上，两种疲劳运动仅在前向诱导 CoP 变异性和 CoP 速度增加疲劳平面（前后）。
当产生相似的力减少水平时，等长和等速疲劳运动引起相似的姿势控制下降。当站在顺应性表面上时，即当脚踝处的本体感觉信息改变时，疲劳对健康年轻男性的姿势控制的影响更为明显。
