Kilbreath S L, Gandevia S C
Department of Clinical Neurophysiology, Prince Henry Hospital, Sydney, Australia.
Exp Brain Res. 1992;91(3):539-42. doi: 10.1007/BF00227850.
Perceived heaviness of a weight lifted by flexion of the distal joint of one digit increases when an adjacent digit concurrently lifts a weight. The present study confirmed this finding for relatively low weights (representing 3-5% maximal voluntary force) and a method was adapted to show that this effect occurs for much larger weights (20-25% maximal force). Thus, the increase in perceived heaviness is likely to operate over a wide range of muscle force generated by the hand. As perceived heaviness is biased by the magnitude of the central motor commands, these findings may reflect a lack of complete independence of motor commands to the long flexor muscles acting on the digits.
当相邻手指同时提起重物时，单指远端关节屈曲提起重物时所感觉到的重量会增加。本研究证实了对于相对较轻的重量（相当于最大自主力量的3-5%）存在这一发现，并且采用了一种方法来表明对于更大的重量（最大力量的20-25%）也会出现这种效应。因此，感觉到的重量增加可能在手部产生的广泛肌肉力量范围内起作用。由于感觉到的重量受中枢运动指令大小的影响，这些发现可能反映了作用于手指的长屈肌运动指令缺乏完全独立性。
