Brunt D, Andersen J C, Huntsman B, Reinhert L B, Thorell A C, Sterling J C
Department of Physical Therapy, University of Florida, Gainesville 32610.
Med Sci Sports Exerc. 1992 Feb;24(2):171-6.
The purpose of this study was to investigate postural responses of healthy subjects and patients with recent ankle sprains following a perturbation that created sway in the frontal plane. EMG data were taken from the posterior tibialis (PT) (not monitored in patients), peroneal longus (PL), and tibialis anterior muscles (TA). Subjects stood on a platform that provided a rotational perturbation (approximately 70 degrees.s-1) in the frontal plane. This perturbation had the effect of everting and loading one limb while inverting and unloading the contralateral limb. An initial response in the PT of the loaded limb and the PL of the unloaded limb was noted at approximately 50 ms following the perturbation. This was followed by a bilateral response in the TA at 60 ms. The amplitude of the TA muscle was significantly greater in the loaded limb. For ankle sprain patients a bilateral TA response and a PL response in the unloaded limb was noted at approximately 65 ms. TA response amplitude ratios between the loaded and unloaded limbs were similar to that of the healthy subjects. These data suggest that ankle sprain patients use a modified postural response following lateral perturbation as a compensation for the injury.
本研究的目的是调查健康受试者和近期踝关节扭伤患者在额面产生摇摆的扰动后的姿势反应。肌电图（EMG）数据取自胫后肌（PT）（患者未监测）、腓骨长肌（PL）和胫骨前肌（TA）。受试者站在一个平台上，该平台在额面提供旋转扰动（约70度·秒⁻¹）。这种扰动会使一侧肢体外翻并负重，同时使对侧肢体内翻并卸载负重。在扰动后约50毫秒时，观察到负重肢体的PT和未负重肢体的PL有初始反应。随后在60毫秒时TA出现双侧反应。负重肢体的TA肌肉振幅明显更大。对于踝关节扭伤患者，在约65毫秒时观察到未负重肢体有双侧TA反应和PL反应。负重和未负重肢体之间的TA反应振幅比与健康受试者相似。这些数据表明，踝关节扭伤患者在侧向扰动后使用了改良的姿势反应来补偿损伤。
