Proske Uwe, Weber Bernhard M
School of Biomedical Sciences, Monash University, Clayton, VIC, 3800, Australia.
Institute of Robotics and Mechatronics, German Aerospace Center, 82234, Wessling, Germany.
NPJ Microgravity. 2023 Aug 11;9(1):64. doi: 10.1038/s41526-023-00318-8.
The senses of limb position and movement become degraded in low gravity. One explanation is a gravity-dependent loss of fusimotor activity. In low gravity, position and movement sense accuracy can be recovered if elastic bands are stretched across the joint. Recent studies using instrumented joysticks have confirmed that aiming and tracking accuracy can be recovered in weightlessness by changing viscous and elastic characteristics of the joystick. It has been proposed that the muscle spindle signal, responsible for generating position sense in the mid-range of joint movement, is combined with input from joint receptors near the limits of joint movement to generate a position signal that covers the full working range of the joint. Here it is hypothesised that in low gravity joint receptors become unresponsive because of the loss of forces acting on the joint capsule. This leads to a loss of position and movement sense which can be recovered by imposing elastic forces across the joint.
肢体位置和运动的感觉在低重力环境下会退化。一种解释是与重力相关的肌梭运动活动丧失。在低重力环境中，如果在关节上拉伸弹性带，位置和运动感觉的准确性可以恢复。最近使用仪器操纵杆的研究证实，通过改变操纵杆的粘性和弹性特性，在失重状态下瞄准和跟踪准确性可以恢复。有人提出，负责在关节运动的中间范围内产生位置感觉的肌梭信号，与关节运动极限附近的关节感受器的输入相结合，以产生覆盖关节整个工作范围的位置信号。在此假设，在低重力环境下，由于作用在关节囊上的力丧失，关节感受器变得无反应。这导致位置和运动感觉丧失，而通过在关节上施加弹力可以恢复这种感觉。
