Effects of vision on head stability and torques during voluntary pulls made by standing humans.
Effects of vision on head stability and torques during voluntary pulls made by standing humans.
复制标题
站立的人自愿拉动时视觉对头部稳定性和扭矩的影响。
DOI：
10.1016/s0304-3940(00)00890-9
复制
发表时间：
2000
影响因子：
2.5
通讯作者：
Lee,WA
中科院分区：
文献类型：
--
作者：
Bedford,DF;Steege,JW;Lee,WA
这项研究测试了这样的假设：在站立的人类受试者进行快速自愿拉动的任务中，视觉可以通过增加颈部肌肉扭矩补偿与身体运动相关的扭矩的程度来改善头部的俯仰平面稳定性。十名受试者在睁眼和闭眼的情况下，对两个峰值力目标突然水平拉动手柄。我们评估了相对于空间的头部角速度。逆动力学用于将作用在头部的扭矩细分为重力交互部分和肌肉部分。根据这两个分量计算扭矩补偿比。对于两个力目标，在睁眼拉动过程中，头部角速度较低，补偿比较高。数据表明，视觉通过提高站立时自愿拉动过程中肌肉扭矩对抗重力交互扭矩的有效性来增强头部稳定性。
This study tested the hypothesis that vision would improve pitch-plane stabilization of the head by increasing how well neck muscle torque compensates for torques associated with body motion, in a task where standing human subjects made rapid voluntary pulls. Ten subjects performed abrupt horizontal pulls on a handle to two peak force targets, with the eyes open and closed. We evaluated head angular velocity with respect to space. Inverse dynamics were used to subdivide the torque acting on the head into gravito-interactive and muscle components. A torque compensation ratio was computed from those two components. Head angular velocity was lower and the compensation ratio was higher during pulls made with the eyes open, for both force targets. The data suggest that vision enhances head stability by increasing the effectiveness with which muscle torques oppose gravito-interactive torques during voluntary pulls made while standing.