在体股后肌群最优长度的测算方法

Estimation Method for Optimal Length of Hamstring Muscles in vivo

目的建立测算在体股后肌群最优长度的方法,并与其他间接反映最优长度的指标进行对比。方法通过同步采集屈膝过程的力矩和运动学数据,建立下肢骨骼肌肉模型,获得股后肌群的力量及肌肉长度,进而计算股后肌群各肌肉的最优长度。结果最大屈膝力矩时膝屈角显著大于股后肌群最大收缩力时膝屈角,两者相关系数为0.741;股后肌群各双关节肌最优长度显著大于站立时的肌肉长度,且两者相关系数较低。结论所建在体股后肌群最优长度的测算方法,为今后明确股后肌群损伤机制和致伤危险因素的相关研究提供参考。在一定程度上,最大屈膝力矩时的膝屈角可以间接代表股后肌群最优长度。不建议将站立时股后肌群长度代替股后肌群最优长度来使用。

Objective To build a method for calculating the optimal length of hamstring muscles in vivo,and make comparison with other indirect parameters which represent the optimal length.Methods By synchronously recording knee flexion torque and kinematic data,the musculoskeletal model of lower limbs was built to obtain hamstring strength and muscle length,and to further calculate the optimal length of hamstring muscles.Results Flexion angle at peak knee flexion torque was significantly greater than that at peak hamstring strength and their correlation coefficient was 0.741.The optimal lengths of each bi-articulated hamstring muscles were significantly greater than the corresponding muscle lengths during standing and their correlation coefficients was low.Conclusions The established estimating method for optimal length of hamstring muscles provided references for future studies on injury mechanism and risk factors.Flexion angle at peak knee flexion torque could partly represent the optimal length of hamstring.It is not suggested that hamstring muscle length during standing should be used as an approximation of hamstring optimal length.