BIOMECHANICAL STUDY OF THE PROGRAMMING OF ANTICIPATORY POSTURAL ADJUSTMENTS ASSOCIATED WITH VOLUNTARY MOVEMENT
BIOMECHANICAL STUDY OF THE PROGRAMMING OF ANTICIPATORY POSTURAL ADJUSTMENTS ASSOCIATED WITH VOLUNTARY MOVEMENT
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DOI：
10.1016/0021-9290(87)90052-2
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发表时间：
1987-01-01
影响因子：
2.4
通讯作者：
ZATTARA, M
中科院分区：
文献类型：
--
作者：
BOUISSET, S;ZATTARA, M
目前的研究关注预期体位调整（APA），目的是确定它们是否预先编程并指定其生物力学最终性。实验情况使我们能够区分自主运动本身（上肢抬高）和与之相关的姿势调整。为此，通过固定在手腕水平的加速度计评估上肢运动学，并将其与通过力平台记录的全身动力学进行比较。根据拉伸上肢的两侧屈曲（BF）和单侧屈曲（UF），有（IUF）和没有（OUF）额外惯性的三种情况，以五组动作进行研究。六名惯用右手的成年人接受了两次测试。结果表明，在上肢加速前后，地面反作用力和地面反作用力沿垂直轴的运动呈现出可重复性的变化。在三种实验条件下，APA的生物力学组织对应于身体重心向上和向前的加速度，对于UF，也对应于直接朝向对侧的合成力矩。APA持续时间随即将到来的自主运动的特征而变化，从BF到OUF和从OUF到IUF显著增加。结论是，APA与集中预编程的动态现象相对应。当时机成熟时，与APA相关的惯性力可能会平衡由于活动肢体运动而产生的惯性力，从而抵消对姿势平衡的干扰。这表明，姿势-动力学规划可能是由CNS对两种生化因素的不同敏感性引起的，一种是线性的，一种是旋转的，这两种生化因素可以表征与自主运动相关的扰动。
The present research concerns anticipatory postural adjustments (APA), with the purpose of determining whether they are preprogrammed and of specifying their biomechanical finality. The experimental situation allowed us to distinguish between the voluntary movement itself (an upper limb elevation) and the postural adjustments associated with it. To this aim, the upper limb kinematics, evaluted from an accelerometer fixed at wrist level, were compared to the whole body dynamics, recorded by means of a force platform. Movements, executed in series of five, were studied according to three conditions: bilateral flexions (BF) and unilateral flexions (UF), with (IUF) and without (OUF) an additional inertia, of the stretched upper limb(s). Six right handed adults were tested twice. Results showed that the ground reaction resultant forces as well as the ground reaction resultant movement about the vertical axis presented reproducible variations before and after the onset of upper limb acceleration. The biomechanical organization of APA corresponded, for the three experimental conditions, to an upward and forward acceleration of the body center of gravity, and also, for UF, to a resultant moment direct towards the contralateral side. The duration of APA varied with the characteristics of the forthcoming voluntary movement, increasing significantly from BF to OUF and from OUF to IUF. It is concluded that APA correspond to dynamic phenomena which are centrally preprogrammed. The inertia forces associated with APA may, when the time comes, balance the inertia forces due to the movement of the mobile limb therefore counteracting the disturbance to postural equilibrium. It is suggested that posturo-kinetic programming could result from a differential sensitivity of the CNS to two biochemical factors, a linear and a rotational one, which can characterize the perturbation associated with voluntary movement.