[100赫兹正弦振动对悬吊状态下大鼠比目鱼肌肌梭传入纤维的影响]
[Influence of 100 Hz sinusoidal vibration on muscle spindle afferents of soleus muscles in suspended situation rat].
作者信息
Ren Jun-chan, Fan Xiao-li, Song Xin-ai, Li Qiang
机构信息
Department of Physiology, Medical College of Xi'an Jiaotong University, Xi'an, China.
出版信息
Space Med Med Eng (Beijing). 2004 Oct;17(5):340-4.
OBJECTIVE
To study influence of 100 Hz sinusoidal vibration on muscle spindle afferents discharges of rat soleus muscles in simulated-weightlessness situation.
METHOD
The tail-suspended rat model was used to simulate weightlessness, and 100 Hz sinusoidal vibration was performed by a vibrator. Unit activity was recorded electrophysiologically from the centrally cut filaments of the spinal dorsal roots innervating muscle spindles of the rat soleus muscle; then observation on the changes in afferent discharges from muscle spindle in a rat soleus muscles were made after 7 d.
RESULT
- Compared with control muscle spindle afferents discharges of rat soleus muscles decreased after 7 d tail-suspension (P<0.05). 2) Compared with suspension the afferent discharges from soleus muscle spindles increased after 7 d tail-suspension with 100 Hz sinusoidal vibration.
CONCLUSION
Sinusoidal vibration (100 Hz; 300 micrometers) can selectively activate muscle spindles. Muscle spindle afferent input of the suspended rats increased after the application of 7 d 100 Hz sinusoidal vibration.
目的
研究100Hz正弦振动对模拟失重状态下大鼠比目鱼肌肌梭传入放电的影响。
方法
采用尾部悬吊大鼠模型模拟失重，用振动器进行100Hz正弦振动。通过电生理记录支配大鼠比目鱼肌肌梭的脊髓背根中央切断细丝的单位活动；然后在7d后观察大鼠比目鱼肌肌梭传入放电的变化。
结果
1）与对照组相比，尾部悬吊7d后大鼠比目鱼肌肌梭传入放电减少（P<0.05）。2）与悬吊组相比，尾部悬吊7d同时施加100Hz正弦振动后比目鱼肌肌梭传入放电增加。
结论
正弦振动（100Hz；300微米）可选择性激活肌梭。施加7d 100Hz正弦振动后，悬吊大鼠的肌梭传入输入增加。
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