Counteractive relationship between the interaction torque and muscle torque at the wrist is predestined in ball-throwing.
Counteractive relationship between the interaction torque and muscle torque at the wrist is predestined in ball-throwing.
复制标题
手腕处的相互作用力矩和肌肉力矩之间的反作用关系是在投球过程中注定的。
DOI：
10.1152/jn.00220.2003
复制
发表时间：
2003
影响因子：
2.5
通讯作者：
T. Ohtsuki
中科院分区：
文献类型：
--
作者：
M. Hirashima;Kunishige Ohgane;Kazutoshi Kudo;K. Hase;T. Ohtsuki
许多研究人员已经证明，在投球等摆动动作中，近端关节(肩部)的运动会产生远端关节(肘部)的辅助相互作用力矩。与这些研究一致，肩部和肘部的运动预计也会产生腕关节的辅助相互作用力矩。然而，我们最近发现，在投球过程中，手腕上的相互作用扭矩总是与手腕肌肉扭矩相反。本研究的目的是通过计算机模拟来阐明投球过程中腕关节的反作用关系是由人类手臂的神经贡献还是肌肉骨骼力学特性引起的。首先，我们通过系统地改变肌肉活动从近端到远端的延迟来模拟正常前臂-手模型的投掷动作，并可以列出两个候选的对抗关系的决定因素：手腕的休止角(中立角)和手的长度和质量。其次，我们模拟了虚拟前臂-手模型的投掷动作，表明只有这两个参数的非真实伸长才能产生相互作用力矩和肌肉力矩之间的辅助关系。这些结果表明，人体手腕的力学性能是决定上肢多关节运动中手腕关节状态稳定的主要因素，有利于避免手腕过度伸展或屈曲，简化手指的外在控制。
Many investigators have demonstrated that in swing motions such as ball-throwing, the motion of the proximal joint (shoulder) produced assistive interaction torque for the distal joint (elbow). In line with these studies, the shoulder and elbow motions would be expected to produce the assistive interaction torque for the wrist joint as well. However, we recently showed that the interaction torque at the wrist was always counteractive to the wrist muscle torque during ball-throwing. The purpose of this study is to clarify, by means of computer simulation, whether the counteractive relationship at the wrist during ball-throwing is caused by the neural contribution or the musculoskeletal mechanical properties of the human arm. First, we simulated the throwing motions of the normal forearm-hand model by systematically changing the proximal-to-distal delay of muscle activities and could line up two candidates for the determinant of the counteractive relationship: the rest angle (neutral angle) of the wrist and the length and mass of the hand. Second, we simulated the throwing motions of the virtual forearm-hand models, showing that only nonrealistic elongation of these two parameters produced the assistive relationship between the interaction torque and muscle torque. These results suggested that the mechanical properties of the human wrist are the main determinant of the counteractive relationship, which is advantageous for keeping the state of the wrist joint stable in multi-joint upper-limb movements and would lead to avoidance of excessive wrist extension or flexion and simplification of extrinsic finger control.
不同速度的画圆运动：惯性各向异性的作用。
DOI：
10.1152/jn.00946.2001
发表时间：
2002
期刊：
Journal of neurophysiology.
影响因子：
--
作者：
Pfann,KerstinD;Corcos,DanielM;Moore,CharityG;Hasan,Ziaul
通讯作者：
Hasan,Ziaul
影响因子：
2.5
作者：
SAINBURG, RL;POIZNER, H;GHEZ, C
通讯作者：
GHEZ, C
影响因子：
2.5
作者：
SAINBURG, RL;GHILARDI, MF;GHEZ, C
通讯作者：
GHEZ, C