新式屈髋肌力训练机在轻重阻力下对下肢肌电与运动范围的影响

Effects on electromyography activity and range of motion in lower limb from a novel hip flexor training machine under light and heavy resistance

目的探讨新式屈髋肌力训练机在轻、重阻力情况下对下肢肌肉兴奋程度与运动范围的影响。方法 6位志愿者在屈髋肌力训练机台上,随机在轻或重阻力条件下进行连续30次的上提与下摆动作,并同时采集运动过程中的肌肉兴奋程度与下肢运动范围。结果肌肉兴奋程度方面,在连续30次动作过程中,重阻力在腹直肌、屈髋肌、臀大肌、股直肌和股二头肌的兴奋程度皆显著高于轻阻力(P<0.05);重阻力在腹直肌、屈髋肌和股直肌后3次的兴奋程度皆显著高于前3次(P<0.05);轻阻力情况下,只有竖脊肌以及股直肌最后3次的兴奋程度显著高于前3次(P<0.05)。运动范围方面,重阻力情况下的动作范围与下摆角度显著小于轻阻力(P<0.05)。结论新式屈髋肌力训练机无论是在轻或重阻力条件下,都能在髋关节合理的活动范围内刺激屈与伸髋主动肌群以及周边协同肌群来完成动作,特别是相对较重阻力的条件下。

Objective To investigate the effect of a novel hip flexor training machine on muscle activation and range of motion（ROM） in lower limb under the condition of different resistances.Methods Six volunteers performed consecutive rightly hip flexion and extension for 30 times under light or heavy resistance randomly on the training machine,and the muscle activity and ROM in lower limb during the movement were measured at the same time.Results The muscle activation of rectus abdominal,hip flexor muscles,gluteus maximum,rectus femoris and biceps femoris under heavy resistance was significantly higher than that under light resistance（P0.05）;the muscle activation of rectus abdominis,hip flexor muscles and rectus femoris at during the last 3 times were significantly higher than that at of the first 3 times under heavy resistance（P0.05）;under light resistance,only the muscle activation of erector spinae and rectus femoris during the last 3 times were significantly higher than that of the first 3 times.The ROM and angle of hip extension under heavy resistance were significantly smaller than those under light resistance.Conclusions Under the rational ROM of hip joint,this new hip flexor training machine can stimulate the hip flexion and extension muscles and other co-contraction muscles to accomplish the movement,especially under the condition of heavy resistance.