Muscle volume is a major determinant of joint torque in humans
Muscle volume is a major determinant of joint torque in humans
复制标题
DOI：
10.1046/j.1365-201x.2001.00867.x
复制
发表时间：
2001-08-01
期刊：
影响因子：
--
通讯作者：
Kanehisa, H
中科院分区：
文献类型：
--
作者：
Fukunaga, T;Miyatani, M;Kanehisa, H
肌肉力量（MF）与生理横截面积（CSA）线性相关，生理横截面积（CSA）由肌肉体积（MV）除以纤维长度获得。考虑到关节扭矩（TO）由MF乘以力臂确定，最大TO将是MV的函数。本研究通过对26名男性肘屈肌和肘伸肌的MV与TO的关系进行了研究。通过磁共振成像（MRI）和超声（US）分别测定了一系列肌肉CSA的EF和EE的MV和羽状角（theta）和FL。EF和EE的最大等长TO在肘关节直角处测量，与肌CSA和TO的相关性相比，EF和EE的MV和TO之间均存在高度显著的相关性（r分别为0.95和0.96），提示TO对MV的依赖性。并以26名健康大学生的MRI测量的MVMRI为参考，建立了由超声测量的肌肉厚度（MT）预测MV（MVRI）的方程，并应用该方程对健康大学生的MV进行了预测（CON; 160名男性）和体育运动员所有受试者（n = 259）的MVST与EF（r = 0.783）和EE（r = 0.695）的TO均呈显著线性关系。ATH患者的MVST显著高于CON患者（EF组和EE组分别增加32%和33%）。同样，ATH患者的TO也显著高于CON患者（EF组和EE组分别增加35%和37%）。EE的θ在两组之间没有差异（CON为17.8度，ATH为17.5度）。另一方面，CON和ATH的TO/MV比值相同。结果表明，上臂的肌肉体积是关节扭矩（TQ）的主要决定因素，无论运动训练。
Muscle force (MF) is linearly related to physiological cross-sectional area (CSA), which is obtained from muscle volume (MV) divided by fibre length. Taking into account the fact that joint torque (TO) is determined by MF multiplied by the moment arm, the maximal TO would be a function of MV. This proposition was tested in the present study by investigating the relationship between MV and TO for elbow flexor (EF) and extensor (EE) muscles of 26 males. The MVs of EF and EE were determined from a series of muscle CSA by magnetic resonance imaging (MRI), and pennation angle (theta) and FL by ultrasonography (US). Maximal isometric TO was measured at right angle of elbow joint for EF and EE, There was a highly significant correlation between MV and TO both for EF and EE (r = 0.95 and 0.96 respectively) compared with that between muscle CSA and TO, suggesting the dependence of TO on MV. Furthermore, prediction equations for MV (MVULT) from muscle thickness (MT) measured by US was developed with reference to MVMRI, by the MRI on 26 subjects, and the equations were applied to estimate MV of healthy university students (CON; 160 males) and sports athletes (ATH; 99 males), There were significant linear relationships between MVULT and TO both for EF (r = 0.783) and EE (r = 0.695) for all subjects (n = 259). The MVULT was significantly higher in ATH (by 32% for EF and 33% for EE, respectively) than in CON. Similarly, significantly greater TO was observed in ATH (by 35% for EF, 37% for EE, respectively). The theta for EE showed no difference between both groups (17.8 degrees for CON and 17.5 degrees for ATH). On the other hand, the TO to MV ratio were identical for CON and ATH. The results reveal that the muscle volume of the upper arm is a major determinant of joint torque (TQ), regardless of athletic training.