EFFECTS OF FUSIMOTOR STIMULATION ON DYNAMIC AND POSITION SENSITIVITIES OF SPINDLE AFFERENTS IN PRIMATE
EFFECTS OF FUSIMOTOR STIMULATION ON DYNAMIC AND POSITION SENSITIVITIES OF SPINDLE AFFERENTS IN PRIMATE
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DOI：
10.1152/jn.1976.39.1.20
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发表时间：
1976-01-01
影响因子：
2.5
通讯作者：
PRESTON, JB
中科院分区：
文献类型：
--
作者：
CHENEY, PD;PRESTON, JB
在狒狒比目鱼肌上研究了刺激单个静态和动态梭运动纤维对初级和次级梭传入的动态敏感性和位置敏感性的影响。静态的梭运动纤维的平均动态敏感性降低初级传入在所有率的拉伸和刺激。动态灵敏度下降的幅度随着梭动刺激速率的增加而增加。在次级传入中观察到类似的效应。静态刺激梭运动对梭传入静息放电有很强的兴奋作用，并使初级和次级传入的平均位置敏感性显著增加。动态梭运动纤维增加的平均动态指数的初级传入在所有率的拉伸和刺激。然而，动态梭动纤维对平均动态敏感性的影响取决于肌肉拉伸的速率;在速率低于15 mm/s时，动态敏感性大幅增加，而在速率大于15 mm/s时，动态敏感性要么不变要么下降。动态梭运动纤维轻微降低初级传入的平均位置敏感性。
The effects of stimulation of single static and dynamic fusimotor fibers on the dynamic sensitivity and position sensitivity of primary and secondary spindle afferents have been studied in the soleus muscle of the baboon. Static fusimotor fibers decreased the mean dynamic sensitivity of primary afferents at all rates of stretch and stimulation. The magnitude of the decrease in dynamic sensitivity increased as the rate of fusimotor stimulation was increased. Qualitatively similar effects were observed in secondary afferents. Static fusimotor stimulation had a strong excitatory effect on spindle afferent resting discharge and greatly increased the mean position sensitivity of both primary and secondary afferents. Dynamic fusimotor fibers increased the mean dynamic index of primary afferents at all rates of stretch and stimulation. The effect of dynamic fusimotor fibers on the mean dynamic sensitivity, however, was dependent on the rate of muscle stretch; at rates below 15 mm/s the dynamic sensitivity was substantially increased, whereas at rates greater than 15 mm/s it was either unchanged or decreased. Dynamic fusimotor fibers slightly decreased the mean position sensitivity of primary afferents.