BEHAVIOR OF HUMAN MUSCLE RECEPTORS WHEN RELIANT ON PROPRIOCEPTIVE FEEDBACK DURING STANDING
BEHAVIOR OF HUMAN MUSCLE RECEPTORS WHEN RELIANT ON PROPRIOCEPTIVE FEEDBACK DURING STANDING
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DOI：
10.1152/jn.1990.64.2.661
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发表时间：
1990-08-01
影响因子：
2.5
通讯作者：
BURKE, D
中科院分区：
文献类型：
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作者：
ANISS, AM;DIENER, HC;BURKE, D
1.本研究调查了站立的人类受试者的胫前屈肌的肌梭放电，而他们进行的演习，改变了他们的依赖本体感觉反馈控制平衡。单单位记录了100个确定的肌肉传入，81个来自肌梭末梢和19个来自高尔基体腱器官。2.有49个纺锤体末端的受试者站在水平平台上，有32个纺锤体末端的受试者站在背屈（4度）倾斜的平台上，以确保胫前肌肉活跃以保持平衡。当自由站立在水平平台上，没有支持或视觉，有很少或没有肌电图（EMG）活动在胫前肌，和梭形放电率低（55%活跃;所有49个结束的平均率，4.1 Hz）。当同样站立在倾斜平台上时，69%的梭形传入是活跃的，平均放电频率为5.4Hz。大量的积极放电的纺锤体传入和保存的平均放电率，尽管肌肉缩短表明，胫前肌受到增加的梭动驱动时，他们是紧张性活动，以保持平衡。3.自愿或外部刺激引起的小程度的身体摇摆的影响进行了研究与41传入（29梭; 12腱器官）。激活胫前肌以补偿向后摆动伴随着纺锤形放电，其通常超过可比被动运动产生的放电。这表明胫前肌在相位活动以保持平衡时受到增加的梭动驱动。4.为了改变对来自本体感受输入的反馈的依赖，受试者突然睁开和闭上眼睛，采取和释放支持，或者倾斜他们的头。传入活动没有可检测到的变化，除非动作产生的变化，在胫前肌肉和/或身体摇摆的EMG活动。30传入（26 46纺锤体; 4 7肌腱器官）经历了与姿势的瞬态变化，记录的力平台，或在受体轴承肌肉的EMG活动的变化相关的放电率的变化。23个传入纤维的放电模式没有显示出任何明显的变化与这些动作。5.它的结论是演习，增加本体感觉反馈的依赖，当受试者静静地站着不显着改变梭电机驱动器的胫骨前肌肉在没有肌肉收缩。（400字处截断摘要）
1. This study investigated the muscle-spindle discharge from the pretibial flexor muscles of standing human subjects while they performed maneuvers that altered their reliance on proprioceptive feedback to control balance. Single-unit recordings were made from 100 identified muscle afferents, 81 from muscle-spindle endings and 19 from Golgi tendon organs. 2. With 49 spindle endings the subjects stood on a horizontal platform and with 32, on a platform tilted in dorsiflexion (4 degrees) to ensure that the pretibial muscles were active to maintain balance. When standing freely on a horizontal platform without support or vision, there was little or no electromyographic (EMG) activity in the pretibial muscles, and spindle discharge rates were low (55% active; mean rate for all 49 endings, 4.1 Hz). When standing similarly on the tilted platform, 69% of the spindle afferents were active, and the mean discharge rate was 5.4 Hz. The greater number of actively discharging spindle afferents and the preservation of mean discharge rate despite muscle shortening indicates that the pretibial muscles are subjected to increased fusimotor drive when they are tonically active to maintain balance. 3. The effects of small degrees of body sway induced voluntarily or by an external stimulus were studied with 41 afferents (29 spindles; 12 tendon organs). Activation of the pretibial muscles to compensate for backward sway was accompanied by a spindle discharge that usually exceeded the discharge produced by comparable passive movement. This indicates that the pretibial muscles are subjected to increased fusimotor drive when they are phasically active to maintain balance. 4. To vary the reliance placed on the feedback from proprioceptive inputs, the subjects abruptly opened and shut their eyes, took and released support, or tilted their heads. There were no detectable changes in afferent activity unless the maneuver produced a change in EMG activity in the pretibial muscles and/or body sway. Thirty afferents (26 of 46 spindles; 4 of 7 tendon organs) underwent a change in discharge rate associated with a transient change in posture, as recorded by the force platform, or a change in EMG activity in the receptor-bearing muscle. The discharge pattern of 23 afferents did not show any clear change with these maneuvers. 5. It is concluded that maneuvers that increase the reliance on proprioceptive feedback when subjects are standing quietly do not significantly alter the fusimotor drive to the pretibial muscles in the absence of muscle contraction.(ABSTRACT TRUNCATED AT 400 WORDS)