title: [Influence of 100 Hz sinusoidal vibration on muscle spindle afferents of soleus muscles in suspended situation rat].
abstract: OBJECTIVE
  To study influence of 100 Hz sinusoidal vibration on muscle spindle afferents discharges of rat soleus muscles in simulated-weightlessness situation.
  
  
  METHODS
  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.
  
  
  RESULTS
  1) 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.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Department of Physiology, Medical College of Xi'an Jiaotong University, Xi'an, China.
authors.forename: Jun-chan
authors.initials: JC
authors.lastname: Ren
authors.forename: Xiao-li
authors.initials: XL
authors.lastname: Fan
authors.forename: Xin-ai
authors.initials: XA
authors.lastname: Song
authors.forename: Qiang
authors.initials: Q
authors.lastname: Li
mesh_terms: D000344:Afferent Pathways / Q000502:physiology; D000818:Animals; D019417:Hindlimb Suspension; D009470:Muscle Spindles / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D009475:Neurons, Afferent / Q000502:physiology; D051381:Rats; D017207:Rats, Sprague-Dawley; D014732:Vibration; D018474:Weightlessness Simulation