M.I.T./Canadian vestibular experiments on the Spacelab-1 mission: 3. Effects of prolonged weightlessness on a human otolith-spinal reflex
M.I.T./Canadian vestibular experiments on the Spacelab-1 mission: 3. Effects of prolonged weightlessness on a human otolith-spinal reflex
复制标题
麻省理工学院/加拿大 Spacelab-1 任务的前庭实验：3. 长时间失重对人类耳石脊髓反射的影响
作者：
D. Watt;K. Money;L. Tomi
在10天的太空飞行之前、期间和之后，测量了依赖于人耳石器官敏感性的反射反应。耳石脊髓反射是通过突然的、意外的福尔斯跌倒引起的。在失重状态下，“福尔斯”是通过从躯干安全带到地板的弹性绳索实现的。从腓肠肌比目鱼肌记录肌电图（EMG）活动。在坠落的前100-120毫秒内发生的EMG反应，被认为主要是耳石-脊髓的起源，在进入失重状态后振幅立即下降，并在整个飞行过程中继续下降，特别是在头两个使命天。在第一次飞行后测试之前，反应恢复正常。结果表明，来自耳石器官的信息逐渐被忽略的神经系统在长时间的空间飞行，虽然耳石脊髓反射的可能性，独立于其他耳石输出途径的减少不能排除。
SummaryReflex responses that depend on human otolith organ sensitivity were measured before, during and after a 10 day space flight. Otolith-spinal reflexes were elicited by means of sudden, unexpected falls. In weightlessness, “falls” were achieved using elastic cords running from a torso harness to the floor. Electromyographic (EMG) activity was recorded from gastrocnemius-soleus. The EMG response occurring in the first 100–120 ms of a fall, considered to be predominantly otolith-spinal in origin, decreased in amplitude immediately upon entering weightlessness, and continued to decline throughout the flight, especially during the first two mission days. The response returned to normal before the first post-flight testing session. The results suggest that information coming from the otolith organs is gradually ignored by the nervous system during prolonged space flight, although the possibility that otolith-spinal reflexes are decreased independent of other otolith output pathways cannot be ruled out.