慢性脑卒中患者全身振动时腿部肌肉活动。

Leg muscle activity during whole-body vibration in individuals with chronic stroke.

机构信息

1Department of Rehabilitation Sciences, Hong Kong Polytechnic University, Hong Kong, CHINA; 2Department of Physiotherapy, Guangdong Provincial Work Injury Rehabilitation Hospital, Guangzhou, CHINA; and 3School of Rehabilitation Sciences, Griffith University, Nathan, Queensland, AUSTRALIA.

出版信息

Med Sci Sports Exerc. 2014 Mar;46(3):537-45. doi: 10.1249/MSS.0b013e3182a6a006.

DOI:10.1249/MSS.0b013e3182a6a006

PMID:23899891

Abstract

PURPOSE

It has been previously shown that whole-body vibration (WBV) can augment muscle activity in young healthy adults. However, the EMG response of leg muscles during WBV in individuals with stroke is unknown. The objective of this study was to determine the influence of WBV on the activity of the vastus lateralis (VL) and gastrocnemius (GS) muscles during the performance of different exercises in chronic stroke patients.

METHODS

Forty-five chronic stroke patients were studied. Each subject was exposed to three WBV conditions of 1) no WBV, 2) low-intensity WBV protocol (peak acceleration: 0.96 unit of gravitational constant [g]), and 3) high-intensity WBV protocol (peak acceleration: 1.61g) while performing eight different static exercises involving upright standing, semisquat, deep squat, weight shifted forward, weight shifted backward, weight shifted to the side, forward lunge, and single-leg standing. Bilateral VL and GS muscle activity was recorded with surface EMG and expressed as a percentage of the EMG amplitude recorded during a maximal voluntary contraction of the respective muscles.

RESULTS

Two-way repeated-measures ANOVA revealed that exposure to WBV (low- and high-intensity protocols) significantly increased VL and GS EMG amplitude (large effect size, partial η = 0.135-0.643, P < 0.001) on both the paretic and nonparetic sides in different exercise conditions compared with no WBV. No significant difference in EMG magnitude was found between the high- and the low-intensity WBV protocols (P > 0.05). With a few exceptions, WBV enhanced EMG activity in the paretic and nonparetic leg muscles to a similar extent in different exercise conditions.

CONCLUSIONS

Leg muscle activity was increased significantly with the addition of WBV. Further clinical trials are needed to determine the effectiveness of different WBV protocols for strengthening leg muscles in chronic stroke patients.

摘要

目的

先前的研究表明，全身振动（WBV）可以增强年轻健康成年人的肌肉活动。然而，脑卒中患者在接受 WBV 时腿部肌肉的肌电图（EMG）反应尚不清楚。本研究旨在确定 WBV 对慢性脑卒中患者在进行不同运动时股外侧肌（VL）和比目鱼肌（GS）肌肉活动的影响。

方法

研究了 45 例慢性脑卒中患者。每位受试者分别接受 3 种 WBV 条件：1）无 WBV，2）低强度 WBV 方案（峰值加速度：0.96 个重力常数 [g]），3）高强度 WBV 方案（峰值加速度：1.61g），同时进行 8 种不同的静态运动，包括直立站立、半蹲、深蹲、向前负重转移、向后负重转移、向侧负重转移、前弓步和单腿站立。使用表面肌电图记录双侧 VL 和 GS 肌肉活动，并表示为各自肌肉最大随意收缩时记录的肌电图幅度的百分比。

结果

双因素重复测量方差分析显示，与无 WBV 相比，低强度和高强度 WBV 方案（大效应量，偏η=0.135-0.643，P<0.001）显著增加了不同运动条件下患侧和非患侧的 VL 和 GS 肌电图幅度。高强度和低强度 WBV 方案之间的肌电图幅度无显著差异（P>0.05）。除了少数例外，在不同的运动条件下，WBV 均能以相似的程度增强患侧和非患侧腿部肌肉的肌电图活动。