[Effects of 100 Hz vibration on ultrastructure of soleus muscle in tail-suspended rats].
OBJECTIVE
To study the effects of 100 Hz vibration on ultrastructure of intrafusal and extrafusal fibers in soleus muscle of tail-suspended rats.


METHODS
Weightlessness was simulated by tail suspension of female rats. The ultrastructure of intrafusal and extrafusal fibers of soleus muscle were examined after exposure to 100 Hz vibration.


RESULTS
The ultrastructure of intrafusal and extrafusal fibers of soleus muscles showed obvious retrograde changes after 7 d tail suspension, whereas these changes were not obvious after 7 d tail suspension plus 100 Hz vibration.


CONCLUSIONS
High frequency vibration can counteract the effect of simulated weightlessness on ultrastructure of intrafusal and extrafusal fibers in soleus muscles of rats.
Yang
Wei
W
Department of Physiology, Medical School of Xi'an Jiaotong University, Xi'an Shannxi, China.
Fan
Xiao-li
XL
Song
Xin-ai
XA
D000818:Animals; D005260:Female; D019417:Hindlimb Suspension; D018656:Muscle Fibers, Fast-Twitch / Q000648:ultrastructure; D018482:Muscle, Skeletal / Q000648:ultrastructure*; D051381:Rats; D017207:Rats, Sprague-Dawley; D014732:Vibration; D018544:Weightlessness Countermeasures; D018474:Weightlessness Simulation