Bock O
Institute for Space and Terrestrial Science, North York, Canada.
Aviat Space Environ Med. 1996 Dec;67(12):1185-9.
Little is known about the effects of changed gravity on the execution of grasping movements, even though such movements play an important role in normal motor behavior of humans.
The formation of an adequate grip aperture is impaired in changed gravity.
During parabolic flight, five subjects grasped mirror-viewed virtual targets with their thumb and index finger. From their video-taped responses, we determined grip aperture as the distance between the two fingertips.
In changed gravity, the final grip aperture was about 15% smaller than in normal gravity, and the peak grip aperture was about 30% less modulated by target size. Both findings were similar in hyper-G and in micro-G.
We conclude that (virtual) grasping in changed gravity is affected by a deterioration of visual and/or proprioceptive signals, or by the increased computational burden of controlling movements in unusual force environments.
尽管抓握动作在人类正常运动行为中起着重要作用，但关于重力变化对抓握动作执行的影响却知之甚少。
在重力变化时，适当的抓握孔径形成会受损。
在抛物线飞行过程中，五名受试者用拇指和食指抓握镜像虚拟目标。从他们的录像反应中，我们将抓握孔径确定为两个指尖之间的距离。
在重力变化时，最终抓握孔径比正常重力下小约15%，峰值抓握孔径受目标大小的调节减少约30%。在超重和微重力条件下，这两个发现相似。
我们得出结论，在重力变化时（虚拟）抓握受到视觉和/或本体感觉信号恶化的影响，或者受到在异常力环境中控制运动增加的计算负担的影响。
