Marín P J, Hazell T J
Laboratory of Physiology, European University Miguel de Cervantes, Valladolid, Spain.
J Musculoskelet Neuronal Interact. 2014 Jun;14(2):213-9.
The current study examined the effects of using an unstable surface during whole-body vibration (WBV) exercise on leg and trunk muscle activity during a static semi-squat. Twenty-eight recreationally active university students completed 4 different test conditions: 1) stable surface with no WBV; 2) unstable surface with no WBV; 3) unstable surface with 30 Hz WBV low amplitude; and 4) unstable surface with 50 Hz WBV low amplitude. Surface electromyography (sEMG) was measured for the gastrocnemius medialis (GM), vastus medialis oblique (VMO), vastus lateralis (VL), rectus abdominis (RA), and multifidus (MF) muscles. Normalized to the stable condition, WBV at 30 Hz and an unstable surface increased EMG in the GM vs the unstable and stable surfaces (35%; p<0.05). VMO EMG decreased in the unstable vs stable condition (20%), WBV at 30 Hz and an unstable surface increased EMG vs all other conditions (~20-40%; p<0.05). MF EMG increased with WBV at 30 Hz (25%; p<0.05) vs the stable condition but not vs all other conditions. Using an unstable surface during WBV exposure increases EMG of muscles in the lower extremities and trunk suggesting the combination of an unstable surface combined with WBV may be an effective modality to further increase EMG.
本研究考察了在全身振动（WBV）运动过程中使用不稳定表面对静态半蹲时腿部和躯干肌肉活动的影响。28名有运动习惯的大学生完成了4种不同的测试条件：1）无WBV的稳定表面；2）无WBV的不稳定表面；3）30Hz低振幅WBV的不稳定表面；4）50Hz低振幅WBV的不稳定表面。测量了腓肠肌内侧头（GM）、股内侧斜肌（VMO）、股外侧肌（VL）、腹直肌（RA）和多裂肌（MF）的表面肌电图（sEMG）。与稳定条件相比，30Hz的WBV和不稳定表面使GM的肌电图相对于不稳定和稳定表面增加（约35%；p<0.05）。与稳定条件相比，不稳定条件下VMO的肌电图下降（约20%），30Hz的WBV和不稳定表面使肌电图相对于所有其他条件增加（约20 - 40%；p<0.05）。与稳定条件相比，30Hz的WBV使MF的肌电图增加（25%；p<0.05），但与所有其他条件相比无增加。在WBV暴露期间使用不稳定表面会增加下肢和躯干肌肉的肌电图，表明不稳定表面与WBV的结合可能是进一步增加肌电图的有效方式。
