通过感知重量变化研究相关感觉输入对人体运动表现的影响。

Effects of related sensory inputs on motor performances in man studied through changes in perceived heaviness.

Gandevia S C, McCloskey D I

J Physiol. 1977 Nov;272(3):653-72. doi: 10.1113/jphysiol.1977.sp012065.

Abstract

The perception of the heaviness of lifted objects was studied using a weight-matching task when sensory inputs from parts related to the lifting task were altered.2. A weight lifted by flexing the index finger feels heavier when the thumb is anaesthetized and lighter when the thumb is electrically stimulated. A weight lifted by flexing the distal joint of the thumb feels heavier when the sensory input from the skin and joint of the thumb is abolished by anaesthesia. It also feels heavier when the index (but not the little) finger is anaesthetized, and lighter when the index (but not the little) finger is electrically stimulated.3. A weight lifted by extending the thumb feels lighter when the sensory input from the thumb is abolished.4. The perceived heaviness of a weight lifted by flexing the thumb is increased during anaesthesia of the thumb when the flexor of the thumb is the prime mover but not when it is acting simply as a postural fixator to support the weight.5. The sensation of the heaviness of lifted objects derives from the effort or centrally generated voluntary motor command employed in the lift. Our results indicate that the motor commands to either thumb or index finger flexors are facilitated by sensory inputs arising from a wide sensory field usually involved in co-operative motor performances carried out by both muscle groups together.

摘要

当与举重任务相关部位的感觉输入发生改变时，通过重量匹配任务对举起物体的重量感知进行了研究。
当拇指麻醉时，通过弯曲食指举起的重量感觉更重；当拇指受到电刺激时，感觉更轻。当拇指皮肤和关节的感觉输入因麻醉而消失时，通过弯曲拇指远端关节举起的重量感觉更重。当食指（而非小指）麻醉时，其感觉也更重；当食指（而非小指）受到电刺激时，感觉更轻。
当拇指的感觉输入消失时，通过伸展拇指举起的重量感觉更轻。
当拇指的屈肌作为主要运动肌时，在拇指麻醉期间，通过弯曲拇指举起的重量的感知重量增加；而当拇指仅作为姿势固定肌来支撑重量时，感知重量则不会增加。
举起物体的重量感觉源自举起过程中所付出的努力或中枢产生的自主运动指令。我们的结果表明，拇指或食指屈肌的运动指令会受到来自广泛感觉区域的感觉输入的促进，这些感觉区域通常参与两组肌肉共同进行的协同运动表现。