正常青年人自然步态下肢肌的表面肌电图分析

背景:肌肉的生物电活动是人体的能动部分,可反映人体运动的功能。目的:观察和分析正常青年人在自然步态中下肢肌肉的表面肌电活动。方法:采用美国NORAXON公司生产的TELEMYO2400RG2表面肌电图仪对30例正常青年人在平地自然行走时,其双下肢股直肌、胫前肌、股二头肌和腓肠肌内侧进行测试,分析在正常步态中受试肌群表面肌电信号的变化规律。结果与结论:正常青年人平地自然步行中,其双下肢股直肌、胫前肌、股二头肌和腓肠肌内侧的肌电随步态周期呈活动与静止周期性变化,左右侧同名肌肉交替活动;平均肌电振幅、平均肌电积分、平均频率、中位频率值最大的是腓肠肌内侧,其余由大到小依次是胫前肌,股二头肌,股直肌,右左腿分布规律一致;右侧腓肠肌内侧平均肌电振幅、平均频率、中位频率值均明显低于左侧(P<0.05);受试肌的时域、频域值波动在一定范围。提示正常青年人自然步态中下肢肌群肌电活动呈节律性和右左侧交替活动;在受试肌中腓肠肌内侧的肌电活动最强;腓肠肌内侧的肌电活动存在着优势侧与非优势侧的轻度差别;下肢肌肌电活动的时域、频域值在一定范围波动。

Surface electromyography analysis of the lower limb muscles of normal young people during natural gait

BACKGROUND:Bioelectricity activities of the muscle are the function part of the human body,which can reflect the motor function of the human body.OBJECTIVE:To observe and analyze the surface electromyography activity of the lower limb muscles of normal young people during natural gait.METHODS:Lower limb muscles (Rectus femoris muscle,Tibialis anterior muscle,Biceps femoris muscle,Medial head of gastrocnemius muscle) of 30 normal young people were tested in flat land walking by surface electromyography (NORAXON TELEMYO 2400R G2,USA).The variation regularity of each parameter within every normal gait was analyzed.RESULTS AND CONCLUSION:While the normal young people ware walking naturally on flat ground,their muscle electrical activities changed in periodic of active and static along with the gait cycle,and the right left side muscle of the same name moved alternately;The maximal values of the mean amplitude,the integral electromyography,the mean frequency,the median frequency were the medial head of gastrocnemius muscle,others from large to small were Tibialis anterior muscle,Biceps femoris muscle,Rectus femoris muscle,and the right-left leg distributed rule was consistent;The mean amplitude,the mean frequency,the median frequency of the right medial head of gastrocnemius muscle were lower than the left corresponding values,and the difference had statistical significance (P < 0.05);Trained muscle’s time domain and frequency range fluctuated in a certain scope.The electrical activity of the lower limb muscles of normal young people is rhythmic and an alternative movement of the right and left during natural gait;The electrical activity of the medial head of gastrocnemius muscle is strongest in trained muscles;The electrical activity of the medial head of gastrocnemius muscle is different between the dominant side and the non-dominant one;Lower limb muscle’s time domain and frequency range can fluctuate in a certain scope.