Muscle force and moment arm contributions to torque production in frog hindlimb.
Muscle force and moment arm contributions to torque production in frog hindlimb.
复制标题
肌肉力量和力臂对青蛙后肢扭矩产生的贡献。
DOI：
10.1152/ajpcell.1988.254.6.c769
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
Boakes,JL
中科院分区：
文献类型：
--
作者：
Lieber,RL;Boakes,JL
研究了蛙后肢最大肌肉强直张力（Po）和肌肉力臂对最大屈膝力矩的相对贡献。在0-160度屈曲范围内，测量青蛙半腱肌-骨复合体的等长扭矩。在140度屈曲时观察到最佳关节角度（等距扭矩最大的角度）。扭矩测量后，切除肌肉，测量肌肉长度-张力关系，以确定Po和最佳肌肉长度。此外，膝关节的运动学，因此，肌肉力矩臂测量作为关节角度的函数，使用刚体运动学的原理。逐步线性回归表明，最大扭矩与Po的相关性最高（r =+0.77，P <0.01），约占测量扭矩的75%。此外，最大扭矩和最大肌肉力臂之间没有显著相关性（r =+0.11，P> 0.7），表明肌肉力量，而不是肌肉骨骼解剖结构，是青蛙后肢产生最大扭矩的主要决定因素。
The relative contribution of maximum muscle tetanic tension (Po) and muscle moment arm to maximum knee flexion torque was investigated in the frog hindlimb. Isometric torque was measured in frog semitendinosus muscle-bone complexes throughout the range of 0-160 degrees of flexion. Optimal joint angle (the angle at which isometric torque was maximum) was observed at 140 degrees of flexion. After torque measurements, the muscle was excised and the muscle length-tension relationship measured for determination of Po and optimal muscle length. In addition, the kinematics of the knee joint and therefore, the muscle moment arm was measured as a function of joint angle using principles of rigid body kinematics. Stepwise linear regression indicated that maximum torque was most highly correlated with Po (r = +0.77, P less than 0.01) and accounted for approximately 75% of the measured torque. In addition, there was no significant correlation between maximum torque and maximum muscle moment arm (r = +0.11, P greater than 0.7) suggesting that muscle force, not musculoskeletal anatomy, represents the major determinant of maximum torque production in the frog hindlimb.