Institute of Biomechanics and Orthopaedics, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933 Cologne, Germany.
Institute of Biomechanics and Orthopaedics, German Sport University Cologne, Am Sportpark Müngersdorf 6, 50933 Cologne, Germany.
J Biomech. 2019 Feb 14;84:73-80. doi: 10.1016/j.jbiomech.2018.12.013. Epub 2018 Dec 17.
The inclusion of muscle forces into the analysis of joint contact forces has improved their accuracy. But it has not been validated if such force and activity calculations are valid during highly dynamic multidirectional movements. The purpose of this study was to validate calculated muscle activation of a lower extremity model with a spherical knee joint for running, sprinting and 90°-cutting. Kinematics, kinetics and lower limb muscle activation of ten participants were investigated in a 3D motion capture setup including EMG. A lower extremity rigid body model was used to calculate the activation of these muscles with an inverse dynamics approach and a cubic cost function. Correlation coefficients were calculated to compare measured and calculated activation. The results showed good correlation of the modelled and calculated data with a few exceptions. The highest average correlations were found during walking (r = 0.81) and the lowest during cutting (r = 0.57). Tibialis anterior had the lowest average correlation (r = 0.33) over all movements while gastrocnemius medius had the highest correlation (r = 0.9). The implementation of a spherical knee joint increased the agreement between measured and modelled activation compared to studies using a hinge joint knee. Although some stabilizing muscles showed low correlations during dynamic movements, the investigated model calculates muscle activity sufficiently.
将肌肉力纳入关节接触力分析中提高了其准确性。但在高度动态的多方向运动中，这种力和活动的计算是否有效尚未得到验证。本研究的目的是验证用于跑步、短跑和 90°变向的具有球形膝关节的下肢模型的计算肌肉激活。在包括肌电图在内的三维运动捕捉设置中，研究了十名参与者的运动学、动力学和下肢肌肉激活。使用刚性下肢模型，通过逆动力学方法和三次成本函数计算这些肌肉的激活。计算相关系数以比较测量值和计算值的激活。结果表明，除了少数例外，模型化和计算数据具有很好的相关性。在行走时，模型和计算数据的相关性最高（r=0.81），在切割时相关性最低（r=0.57）。在所有运动中，胫骨前肌的平均相关性最低（r=0.33），而腓肠肌中肌的相关性最高（r=0.9）。与使用铰链式膝关节的研究相比，球形膝关节的实施增加了测量值和模型化激活之间的一致性。尽管一些稳定肌肉在动态运动中表现出低相关性，但所研究的模型可以充分计算肌肉活动。
