EFFECT OF THUMB ANESTHESIA ON WEIGHT PERCEPTION, MUSCLE-ACTIVITY AND THE STRETCH REFLEX IN MAN
EFFECT OF THUMB ANESTHESIA ON WEIGHT PERCEPTION, MUSCLE-ACTIVITY AND THE STRETCH REFLEX IN MAN
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DOI：
10.1113/jphysiol.1979.sp012931
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发表时间：
1979-01-01
影响因子：
5.5
通讯作者：
TRAUB, MM
中科院分区：
文献类型：
--
作者：
MARSDEN, CD;ROTHWELL, JC;TRAUB, MM
Gandevia和McCloskey关于拇指麻醉对拇指举起的重量感知的影响的结果得到了证实。屈举重物感觉较重，伸举重物感觉较轻。拇指麻醉后拇长屈肌或拇长伸肌长潜伏期牵张反射的大小变化不能解释去除或增强背景伺服对肌肉收缩的辅助对重量感知的影响。在拇指平滑屈曲期间，拇指麻醉增加e.m.g. [肌电图]对于任何给定的相反扭矩，拇长屈肌和拇长伸肌的活动。在平滑的拇指伸展期间，发生相反的情况;例如，拇长伸肌和拇长屈肌的活动都降低。在近节指骨处夹紧拇指以限制仅在指间关节的运动，可以减少或消除麻醉对体重感知和肌电的影响。在屈曲或伸展任务期间的活动。Gandevia和McCloskey关于拇指麻醉对体重感知的扭曲效应的发现不能用来支持努力感传出监测系统的假设。强调皮肤和关节传入信息和运动控制之间的密切功能关系。
The results of Gandevia and McCloskey on the effect of thumb anesthesia on perception of weights lifted by the thumb were confirmed. Weights lifted by flexion feel heavier and weights lifted by extension feel lighter. The change in size of the long-latency stretch reflex in flexor pollicis longus or extensor pollicis longus after thumb anesthesia cannot explain the effect on weight perception by removal or augmentation of the background servo assistance to muscular contraction. During smooth thumb flexion, thumb anesthesia increases e.m.g. [electromyogram] activity in flexor pollicis longus and extensor pollicis longus for any given opposing torque. During smooth thumb extension the opposite occurs; e.m.g., activity in both extensor and flexor pollicis longus decreases. Clamping the thumb at the proximal phalanx to limit movement solely to the interphalangeal joint reduces or abolishes the effect of anesthesia on both weight perception and e.m.g. activity during both flexion or extension tasks. Gandevia and McCloskey''s findings on the distorting effects of thumb anesthesia on weight perception cannot be used to support the hypothesis of an efferent monitoring system of the sense of effort. The close functional relationship between cutaneous and joint afferent information and motor control is emphasized.