Inglis J T, Frank J S
Department of Kinesiology, University of Waterloo, Ontario, Canada.
Exp Brain Res. 1990;81(3):573-80. doi: 10.1007/BF02423506.
During voluntary movement, muscle spindles of both the agonist and antagonist muscles potentially can supply information about position of the limb. Muscle vibration is known to increase muscle spindle discharge and cause systematic distortions of limb position sense in humans. The following two experiments attempted to examine these contributions by separately vibrating over the triceps and biceps muscles during forearm positioning. In the first experiment, subjects performed a horizontal flexion or extension of the right arm to a mechanical stop randomly positioned at 20, 40 or 60 degrees. Vision was occluded and vibration was applied to the right arm. The perceived position of the right limb was assessed by instructing subjects to simultaneously match the right arm position with the left limb. Vibration of the shortening, agonist muscle had no effect on limb matching accuracy. However, antagonist muscle vibration resulted in a significant overestimation of the vibrated limb position by 6-13 degrees. The procedures for the second experiment were similar to the first, except that movements of the right limb were self-terminated and only flexion movements were performed. A screen was mounted over the arms and subjects were instructed to move the right arm until it was positioned beneath a marker on the screen. Vibration of the shortening agonist muscle had no effect on either the positioning accuracy of the right limb or matching accuracy of the left limb. However, antagonist muscle vibration resulted in significantly shorter movements (6-10 degrees) by the right limb and an overestimation of right limb position by the left, matching limb.(ABSTRACT TRUNCATED AT 250 WORDS)
在自主运动过程中，主动肌和拮抗肌的肌梭都有可能提供有关肢体位置的信息。已知肌肉振动会增加肌梭放电，并导致人类肢体位置觉出现系统性扭曲。以下两个实验试图通过在前臂定位过程中分别对肱三头肌和肱二头肌进行振动来研究这些影响。在第一个实验中，受试者将右臂水平屈伸至随机设置在20度、40度或60度的机械限位处。遮住视觉并对右臂施加振动。通过指示受试者同时将右臂位置与左臂位置匹配来评估右肢的感知位置。缩短的主动肌的振动对肢体匹配准确性没有影响。然而，拮抗肌振动导致振动肢体位置被显著高估6 - 13度。第二个实验的步骤与第一个相似，只是右肢的运动是自我终止的，并且只进行屈曲运动。在手臂上方安装了一个屏幕，并指示受试者移动右臂，直到其位于屏幕上的一个标记下方。缩短的主动肌的振动对右肢的定位准确性或左肢的匹配准确性均无影响。然而，拮抗肌振动导致右肢的运动明显缩短（6 - 10度），并且左匹配肢高估了右肢位置。（摘要截取自250词）
