Effects of Vibration Intensity, Exercise, and Motor Impairment on Leg Muscle Activity Induced by Whole-Body Vibration in People With Stroke
Effects of Vibration Intensity, Exercise, and Motor Impairment on Leg Muscle Activity Induced by Whole-Body Vibration in People With Stroke
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DOI：
10.2522/ptj.20140507
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发表时间：
2015-12-01
期刊：
影响因子：
3.2
通讯作者：
Pang, Marco Y. C.
中科院分区：
文献类型：
--
作者：
Liao, Lin-Rong;Ng, Gabriel Y. F.;Pang, Marco Y. C.
背景资料。全身振动(WBV)已越来越多地被用作神经康复的辅助治疗。然而，中风后个体在暴露于不同的WBV方案期间肌肉激活水平如何变化的研究还不够深入。本研究旨在探讨WBV强度对慢性卒中患者股二头肌(BF)和胫前肌(TA)活动的影响及其与运动的相互作用，以及与运动损伤和痉挛程度的关系。36例慢性卒中患者(平均年龄57.3岁，SD=10.7)分别在3种WBV条件下进行8种不同的静态运动：(1)无WBV，(2)低强度WBV(频率=20 Hz，幅度=0.60 mm，峰值加速度=0.96g)，(3)高强度WBV(30 Hz，0.44 mm，1.61g)。用表面肌电信号(EMG)记录双侧TA和BF肌电活动。强度的主效应显著。与没有WBV相比，暴露于低强度和高强度方案导致双腿正常化的BF和TA肌肉肌电幅度显著增加。运动强度的交互作用也是显著的，这表明WBV诱导的肌电活动增加是运动依赖的。偏瘫和非偏瘫小腿对WBV的肌电反应相似，与肢体运动损伤程度和痉挛程度无关。限制。仅在静态运动中测量腿部肌肉活动。在运动中增加WBV显著增加了TA和BF肌肉的肌电活动。偏瘫和非偏瘫小腿对WBV的肌电反应相似，与运动损伤程度和痉挛程度无关。这些发现对指导中风患者的WBV训练方案的设计是有用的。
Background. Whole-body vibration (WBV) has increasingly been used as an adjunct treatment in neurological rehabilitation. However, how muscle activation level changes during exposure to different WBV protocols in individuals after stroke remains understudied.Objective. The purpose of this study was to examine the influence of WBV intensity on the magnitude of biceps femoris (BF) and tibialis anterior (TA) muscle activity and its interaction with exercise and with severity of motor impairment and spasticity among individuals with chronic stroke.Methods. Each of the 36 individuals with chronic stroke (mean age=57.3 years, SD=10.7) performed 8 different static exercises under 3 WBV conditions: (1) no WBV, (2) low-intensity WBV (frequency=20 Hz, amplitude=0.60 mm, peak acceleration=0.96g), and (3) high-intensity WBV (30 Hz, 0.44 mm, 1.61g). The levels of bilateral TA and BF muscle activity were recorded using surface electromyography (EMG).Results. The main effect of intensity was significant. Exposure to the low-intensity and high-intensity protocols led to a significantly greater increase in normalized BF and TA muscle electromyographic magnitude in both legs compared with no WBV. The intensity X exercise interaction also was significant, suggesting that the WBV-induced increase in EMG activity was exercise dependent. The EMG responses to WBV were similar between the paretic and nonparetic legs and were not associated with level of lower extremity motor impairment and spasticity. Limitations. Leg muscle activity was measured during static exercises only.Conclusions. Adding WBV during exercise significantly increased EMG activity in the TA and BF muscles. The EMG responses to WBV in the paretic and nonparetic legs were similar and were not related to degree of motor impairment and spasticity. The findings are useful for guiding the design of WBV training protocols for people with stroke.