Fath Florian, Blazevich Anthony J, Waugh Charlie M, Miller Stuart C, Korff Thomas
Centre for Sports Medicine and Human Performance, Brunel University, London, UK.
J Appl Biomech. 2013 Apr;29(2):241-4. doi: 10.1123/jab.29.2.241.
The muscle-tendon moment arm is an important input parameter for musculoskeletal models. Moment arms change as a function of joint angle and contraction state and depend on the method being employed. The overall purpose was to gain insights into the interactive effects of joint angle, contraction state and method on the Achilles tendon moment arm using the center of rotation (COR) and the tendon excursion method (TE). Achilles tendon moment arms were obtained at rest (TErest, CORrest) and during a maximum voluntary contraction (CORMVC) at four angles. We found strong correlations between TErest and CORMVC for all angles (.72 ≤ r ≤ .93) with Achilles tendon moment arms using CORMVC being 33-36% greater than those obtained from TErest. The relationship between Achilles tendon moment arms and angle was similar across both methods and both levels of muscular contraction. Finally, Achilles tendon moment arms for CORMVC were 1-8% greater than for COR(rest).
肌肉 - 肌腱力臂是肌肉骨骼模型的一个重要输入参数。力臂会随着关节角度和收缩状态而变化，并且取决于所采用的方法。总体目的是利用旋转中心（COR）和肌腱偏移方法（TE）深入了解关节角度、收缩状态和方法对跟腱力臂的交互作用。在四个角度下分别在静息状态（TErest、CORrest）和最大自主收缩（CORMVC）期间获取跟腱力臂。我们发现，对于所有角度，TErest和CORMVC之间存在很强的相关性（0.72≤r≤0.93），使用CORMVC得到的跟腱力臂比从TErest获得的跟腱力臂大33 - 36%。两种方法以及两种肌肉收缩水平下，跟腱力臂与角度之间的关系相似。最后，CORMVC时的跟腱力臂比COR（rest）时大1 - 8%。
