Clément G, André-Deshays C
Laboratoire de Physiologie Neurosensorielle du C.N.R.S., Paris, France.
Neurosci Lett. 1987 Aug 18;79(1-2):113-6. doi: 10.1016/0304-3940(87)90681-1.
Maintenance of an upright posture was measured in human subjects during increased and decreased gravitoinertial force phases of parabolic flight. Upright posture was maintained by tonic activity of the ankle joint extensor muscle (soleus) during the one-g or two-g phases. During the zero-g phase the same posture was maintained primarily by activity of the flexor muscle (tibialis). Downward and upward optokinetic stimulation induced strong postural reactions directed forwards and backwards, respectively. These reactions were accompanied by changes of motor activity of the flexor muscle. This suggests a rapid redistribution of motor programs between extensor and flexor muscles with an increase in visual input influence, and confirms results obtained during space flight.
在抛物线飞行的重力惯性力增加和减少阶段，对人体受试者的直立姿势维持情况进行了测量。在1g或2g阶段，踝关节伸肌（比目鱼肌）的紧张性活动维持着直立姿势。在零重力阶段，相同的姿势主要由屈肌（胫骨前肌）的活动维持。向下和向上的视动刺激分别诱发了向前和向后的强烈姿势反应。这些反应伴随着屈肌运动活动的变化。这表明随着视觉输入影响的增加，运动程序在伸肌和屈肌之间快速重新分配，并证实了在太空飞行期间获得的结果。
