The effects of whole-body vibration on upper- and lower-body EMG during static and dynamic contractions
The effects of whole-body vibration on upper- and lower-body EMG during static and dynamic contractions
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DOI：
10.1139/h07-116
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发表时间：
2007-12-01
影响因子：
3.4
通讯作者：
Kenno, Kenji A.
中科院分区：
文献类型：
--
作者：
Hazell, Tom J.;Jakobi, Jennifer M.;Kenno, Kenji A.
全身振动（WBV）训练使用垂直振荡平台，报告表明，这种扰动激发反射性肌肉收缩，增强肌肉活动并有助于增加力量。没有WBV研究测量了上半身和下半身肌肉的激活。本研究的目的是确定最佳的WBV刺激（频率x幅度），以增加肌电图（EMG）在上半身和下半身肌肉的三个独特的卸载行动：等距半蹲，动态腿蹲，静态和动态的双边二头肌卷曲。在10名娱乐活跃的男性大学生（24.4 ± 2.0岁;平均值± SD）中，当WBV以2 mm和4 mm以及25、30、35、40和45 Hz施用时，测量股外侧肌（VL）、股二头肌（BF）、肱二头肌（BB）和肱三头肌（TB）的表面EMG。EMG变化报告为WBV和无WBV EMG均方根之间的差异，表示为最大随意用力的百分比（%MVE）。在静态半蹲下，WBV使VL的肌肉活动增加2.9%-6.7%，BF增加0.8%-1.2%。在动态下蹲过程中，WBV使VL的肌肉活动增加3.7%-8.7%，BF增加0.4%-2.0%。在静态屈肱二头肌时，WBV对BB EMG无影响，但可使TB活动增加0.3%-0.7%。在动态屈肱二头肌时，WBV使BB EMG活性增加0.6%-0.8%，TB活性增加0.2%-1.0%。较高的WBV幅度（4 mm）和频率（35，40，45 Hz）导致EMG活动的最大增加。
Whole-body vibration (WBV) training uses a vertically oscillating platform and reports suggest that this perturbation elicits reflexive muscle contractions that augment muscle activity and contribute to increased strength. No WBV study has measured both upper- and lower-body muscle activation. The purpose of this study was to determine the optimal WBV stimulus (frequency x amplitude) to increase electromyography (EMG) in upper- and lower-body muscles for three distinctive unloaded actions: isometric semi-squat, dynamic leg squats, and static and dynamic bilateral bicep curls. Surface EMG was measured for the vastus lateralis (VL), biceps femoris (BF), biceps brachii (BB), and triceps brachii (TB) in 10 recreationally active male university students (24.4 +/- 2.0 years; mean +/- SD) when WBV was administered at 2 and 4 mm and at 25, 30, 35, 40, and 45 Hz. EMG changes are reported as the difference between WBV and no WBV EMG root mean square expressed as a percentage of maximum voluntary exertion (%MVE). In static semi-squat, WBV increased muscle activity 2.9%-6.7% in the VL and 0.8%-1.2% in the BF. During dynamic squatting, WBV increased muscle activity in the VL by 3.7%-8.7% and in the BF by 0.4%-2.0%. In a static biceps curl, WBV had no effect on BB EMG, but did increase TB activity 0.3%-0.7%. During dynamic biceps curls, WBV increased BB EMG activity by 0.6%-0.8% and TB activity by 0.2%-1.0%. The higher WBV amplitude (4 mm) and frequencies (35, 40, 45 Hz) resulted in the greatest increases in EMG activity.