Maganaris C N, Paul J P
Scottish School of Sport Studies, University of Strathclyde, G13 1PP, Glasgow, UK.
J Biomech. 2000 Nov;33(11):1453-9. doi: 10.1016/s0021-9290(00)00099-3.
In the present study, we examined the hypothesis that stretch of tendinous tissue in the human tibialis anterior (TA) muscle-tendon unit upon isometric dorsiflexion maximum voluntary contraction (MVC) varies along the entire tendinous component length. Ultrasound-based measurements of the excursions of the TA tendon origin and proximal end of the TA central aponeurosis were taken in the transition from rest to MVC in six men. Subtracting the TA tendon origin excursion from the excursion of the aponeurosis proximal end, the aponeurosis excursion was estimated. Estimation of the aponeurosis proximal region excursion was obtained subtracting the excursion of the insertion point of a central region fascicle on the aponeurosis from the whole aponeurosis excursion. Subtracting tendon excursion from the excursion of the central fascicle insertion point, the aponeurosis distal region excursion was estimated. Strain values were calculated dividing the excursions obtained by the original resting lengths. All excursions and lengths were measured in the mid-longitudinal axis of the TA muscle-tendon unit at the neutral anatomical ankle position. Tendon excursion and strain were 0.5+/-0. 08 cm (mean+/-SE) and 3.1+/-0.2%, respectively. Aponeurosis excursion and strain were 1.1+/-0.15 cm and 6.5+/-0.6%, respectively. Aponeurosis distal region excursion and strain were 0.3+/-0.05 cm and 3.5+/-0.3%, respectively. Aponeurosis proximal region excursion and strain were 0.8+/-0.12 cm and 9.2+/-1%, respectively. Aponeurosis excursion and strain were larger by 110-120% (P<0.05) compared with tendon. Aponeurosis proximal region excursion and strain were larger by 165-170% (P<0.05) compared with aponeurosis distal region. These findings are in line with results from in vitro animal material testing and have important implications for theoretical models of muscle function.
在本研究中，我们检验了这样一个假设：在人体胫骨前肌（TA）肌腱单位进行等长背屈最大自主收缩（MVC）时，肌腱组织的拉伸在整个肌腱成分长度上是变化的。对6名男性从静息状态到MVC的过程中，基于超声测量TA肌腱起点和TA中央腱膜近端的位移。用腱膜近端的位移减去TA肌腱起点的位移，估算腱膜的位移。腱膜近端区域位移的估算方法是，用整个腱膜的位移减去腱膜上中央区域肌束插入点的位移。用中央肌束插入点的位移减去肌腱的位移，估算腱膜远端区域的位移。应变值通过将所获得的位移除以原始静息长度来计算。所有位移和长度均在TA肌腱单位的中立解剖学踝关节位置的中纵轴上进行测量。肌腱位移和应变分别为0.5±0.08厘米（平均值±标准误）和3.1±0.2%。腱膜位移和应变分别为1.1±0.15厘米和6.5±0.6%。腱膜远端区域位移和应变分别为0.3±0.05厘米和3.5±0.3%。腱膜近端区域位移和应变分别为0.8±0.12厘米和9.2±1%。与肌腱相比，腱膜位移和应变大110 - 120%（P<0.05）。与腱膜远端区域相比，腱膜近端区域位移和应变大165 - 170%（P<0.05）。这些发现与体外动物材料测试的结果一致，并且对肌肉功能的理论模型具有重要意义。
