Simultaneous control of dynamic standing posture on an oscillating platform and the upper limb movement in adults and children

我们调查了成人（15名男性和15名女性，年龄19-23岁）在振动平台上的动态站立姿势和上肢运动的同时控制。和儿童（20名男孩和11名女孩，年龄5-6岁）。振动台上安装有测力平台，在前后方向上以2.5cm的振幅和0.5Hz的频率正弦振动。将显示在面贴式显示器上的目标点以20 °视角和0.3Hz频率沿横向正弦移动。上肢运动是用一个电位器的电信号，这是控制向横向方向。显示器上还显示了由上肢控制的跟踪目标点的跟踪点。肢体运动在肢体训练期后在安静站立（对照）下测量1分钟。之后，将1分钟的地板振荡重复6次。第1次和第6次试验同时进行肢体运动，所有受试者足底压力中心波动的平均速度在第3次试验前迅速下降，此后无明显变化。第6次试验的速度与第5次试验相比，成人组男女和男孩的速度均显著增加。在成人组和儿童组中，第一次试验的肢体追踪成绩最低。对照组与第6次成年组的追踪成绩无显著性差异。儿童组第6次试验的成绩显著低于对照组，提示：（1）随着姿势控制的自动化，动态站立姿势和上肢运动的同步控制能力提高;（2）儿童组尤其是男孩的提高不如成人。

We investigated simultaneous control of dynamic standing posture on an oscillating platform and the upper limb movement in adults (15 men and 15 women, aged 19-23 yrs.) and children (20 boys and 11 girls, aged 5-6 yrs.).The oscillating table mounted with a force platform was oscillated sinusoidaly in anteroposterior direction with 2.5 cm amplitude and 0.5 Hz frequency. A target spot, which was presented on a face mounting display, was moved sinusoidaly in lateral direction with visual angle of 20 degrees and 0.3 Hz frequency. Upper limb movement was picked up using electric signal of a potentiometer that was controlled toward lateral direction. A tracing spot for following the target spot, which was controlled by the upper limb, was also presented on the display. The limb movement was measured for 1 minute in quiet standing (Control) after the limb training session. After that, the floor oscillation for 1 minute was repeated 6 times. The limb movement was simultaneously performed in the 1st and 6th trials.For all subjects, the mean speed of the fluctuation of center of foot pressure decreased rapidly until the 3rd trial, exhibiting no significant change thereafter. The speed in the 6th trial was significantly increased relative to that in the 5th trial for both sexes of adult-group and for boys. The limb tracing performance was the lowest in the 1st trial in adult-and child-groups. No significant difference in the tracing performance was found between Control and the 6st trials for adult-group. The performance of the 6th trial in child-group was significantly lower than that of Control trial.These results suggest that (1) simultaneous control of dynamic standing posture and the upper limb movement improves with automatization of the postural control ; (2) the improvement in children, especially in boys, was inferior to that in adults.