García-Gutiérrez M T, Rhea M R, Marín P J
Laboratory of Physiology, European University Miguel de Cervantes, Valladolid, Spain.
J Musculoskelet Neuronal Interact. 2014 Sep;14(3):303-10.
The first purpose of this study was to determine the effects of whole-body vibration (WBV) exercise during an isometric hand-grip exercise. The second purpose was to evaluate whether more than one vibratory focus would evoke an increase in the effects evoked by only one vibratory focus. The present study investigated whether WBV exposure during 10 repetitions of a handgrip dynamometer while standing on a WBV platform. Twenty-eight recreationally active university students completed 3 different test conditions, in random order: 1) grip dynamometer exercise with superimposed WBV and contralateral arm vibration (WBV+AV); 2) superimposed arm vibration only (AV); 3) grip dynamometer exercise without vibration (Control). The hand grip strength was slightly higher in the WBV condition as compared to the Control and AV conditions (1.1% and 3.6%, p>0.05, respectively). A main effect of the EMGrms of extensor digitorum muscle (ED) was observed indicating that the WBV+AV condition produced a lower co-activation of ED during a flexor digital task than the Control and AV (p<0.05) conditions. The application of WBV+AV may acutely increase muscle coordination and decreases the coactivation of ED. Furthermore, the muscle EMGrms showed increases in activation near the vibratory focus in both upper- and lower-body.
本研究的首要目的是确定在等长握力运动期间全身振动（WBV）锻炼的效果。第二个目的是评估多个振动焦点是否会比单一振动焦点引发的效果有所增强。本研究调查了站在WBV平台上进行10次握力计测试期间WBV暴露的情况。28名有休闲运动习惯的大学生按随机顺序完成了3种不同的测试条件：1）握力计运动叠加WBV和对侧手臂振动（WBV+AV）；2）仅叠加手臂振动（AV）；3）无振动的握力计运动（对照）。与对照和AV条件相比，WBV条件下的握力略高（分别为1.1%和3.6%，p>0.05）。观察到指伸肌（ED）的肌电图均方根（EMGrms）有主要效应，表明在手指屈曲任务期间，WBV+AV条件下ED的共同激活低于对照和AV（p<0.05）条件。WBV+AV的应用可能会急性增加肌肉协调性并减少ED的共同激活。此外，肌肉EMGrms显示上半身和下半身振动焦点附近的激活均增加。
