The EMG average amplitude was increased with the increase of the trunk rotation angle without significant difference (P>0.05).
随躯干旋转角度的增加，竖脊肌肌电幅度呈升高的趋势，但差异无统计学意义（P＞0．05）。
P300 average amplitude on parietal area was increasing with age increasing and junior high school group's was significantly lower than two others.
在顶区的P300的平均幅值随着年龄的增长而增加，且初中组明显低于其它两个组。
P300 average amplitude on parietal area was increasing with age increasing and junior high school group's was significantly lower than two others.
在顶区的P300的平均幅值随着年龄的增长而增加，且初中组明显低于其它两个组。
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