局部低频振动刺激对手部运动功能的瞬时影响

Acute effect of local vibration stimulus with low frequency on hand motor function

目的探讨局部低频振动刺激对手部控制能力、柔韧性、握力及肌肉兴奋程度的瞬时影响。方法 10位受试者以最大等长收缩握住手部振动器20 s,在此过程中随机给予12.5 Hz振动频率(振动组)或无振动刺激(对照组)。在介入前后分别进行手部控制能力、柔韧性、握力及手部肌肉兴奋程度等测验,并采用配对t检验比较前后测试的差异和各组变化率。结果组内比较发现振动组在控制能力与柔韧性表现上进步显著(P<0.05),对照组在握力与肌肉活化上出现显著下降(P<0.05);组间变化率比较结果显示振动组在握力与肌肉兴奋程度变化率皆显著大于对照组(P<0.05)。结论局部低频振动刺激可瞬时提升手部控制能力与柔韧性表现,未来可运用于各种需要手部执行工作的相关人员。

Objective To investigate the acute effect of local vibration stimulus with low frequency on hand control ability,flexibility,grip strength,and muscle EMG activity.Methods 10 subjects in this study held a vibrator for 20 seconds with isometric contraction at the vibration frequency of 12.5 Hz（vibration group,VIB） or with only isometric contraction（control group,CON）.The same procedure measurement,including control ability,flexibility,grip strength,and muscle activity,were recorded both at pre-stimulus（pre-test） and 60-second after stimulus（post-test）,respectively.Paired-t test was used to compare the values between pre-test and post-test and the changing rate between groups.Results The control ability and flexibility in pre-post test showed significant improvement after VIB intervention in VIB（P0.05）.The changing rate of grip strength and EMG in VIB was significantly higher than those in CON（P0.05）.Conclusions Acute local vibration stimulus with low frequency can be used to improve the hand control ability and flexibility for those who need better hand functional ability in the future.