腓肠肌及股后屈肌群伸膝作用的肌电图研究

THE ACTION OF GASTROCNEMIUS AND HAMSTRING MUSCLES DURING KNEE EXTENTION;AN ELECTROMYOGRAPHIC STUDY

按目前解剖文献记载^([1,2,3]),腓肠肌为足的踱屈肌,兼有屈膝的机能。张鋆等氏提出^([4]):人类腓肠肌在蹲地起立及骑车的情况下,尚有协助伸膝关节维持直立的作用。至于股后屈肌群(即半腱、半膜肌及股二头肌长头)是否有协助伸膝的作用,迄今未见有文献报告。我们用肌电图描记法,对腓肠肌及股后屈肌群协助伸膝的作用进行了研究,并用力学分析作进一步的论证。

The electromyography of gastrocnemius and hamstring muscles was studied by sur-face electrodes.Nine healthy male volunteers were involved in this experiment.The results of electromyogram showed that when squatting up or stretching the knee against the wall,the gastrocnemius and the hamstring muscles participated in the knee extention.This was more prominent during the later phase of knee extention.When the hip flexed,the quadriceps femoris relaxed,and then both the mentioned groups of muscles acted as the prime movers of knee extention.Viewed from mechanical analysis,the au-thors suggest that when the heel is fixed and the lower limb is burdened,the combined force of the gastrocnemius and hamstring muscles draws the knee backwards,thus a lifting force to extend the knee is produced and the erecting posture is maintained.