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首页> 外文期刊>Brain research bulletin >Effects of foreperiod duration on anticipatory postural adjustments: determination of an optimal preparation in standing and sitting for a raising arm movement.
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Effects of foreperiod duration on anticipatory postural adjustments: determination of an optimal preparation in standing and sitting for a raising arm movement.

机译：前期持续时间对预期姿势调整的影响：确定站立和坐着以提高手臂动作的最佳准备。

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摘要

The purpose of the present experiment was to examine the motor and postural preparation processes evolving during the foreperiod (known to be optimal at 500 ms in sitting) in a voluntary upper limb movement executed while standing. The foreperiod duration (300, 500, 700 and 900 ms) and the postural conditions (sitting versus standing) were manipulated using a priming procedure. Two types of prime were provided: (1) a prime giving valid information on the side of the raising arm movement to execute, and (2) a prime giving non-valid information (prime opposite to the required side). In a sitting and standing condition, eight normal subjects performed a raising arm movement with a 1 kg load at the level of the wrist. Premotor time and acceleration of arm movement were recorded in the two postural conditions. In the standing condition, anticipatory postural adjustments (APAs) were also quantified using the relative latency of electromyographic (EMG) data and the centre of foot pressure (CoP) displacements.Results (1) showed that the optimal foreperiod duration (i.e., leading to the shortest premotor time) increased as a function of postural conditions (500 versus 700 ms in the sitting and standing conditions, respectively), and (2) emphasized the existence of a temporal modulation in the central organization of the postural and focal commands according to the foreperiod duration.
机译：本实验的目的是检查站立时自愿进行的上肢运动（在坐前500毫秒时最佳）的前肢运动过程中的运动和姿势准备过程。前期持续时间（300、500、700和900 ms）和姿势条件（坐着还是站着）都使用启动程序进行操作。提供了两种类型的素数：（1）在执行手臂运动的一侧提供有效信息的素数，以及（2）给出无效信息的素数（与所需面相反的素数）。在坐着和站着的状态下，八名正常受试者在手腕处以1 kg的负荷进行抬臂动作。在两种姿势条件下记录运动前时间和手臂运动加速。在站立状态下，还使用肌电图（EMG）数据的相对潜伏期和足部压力中心（CoP）位移来量化预期姿势调整（APA）。结果（1）显示最佳前躯持续时间（即导致最短的运动前时间）随着姿势条件的增加而增加（分别在坐姿和站立状态下分别为500和700 ms），并且（2）强调根据姿势和焦点命令的中央组织中存在时间调制前期持续时间。

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