[Influence of 100 Hz sinusoidal vibration on muscle spindle afferents of soleus muscles in suspended situation rat]

Space Med Med Eng (Beijing). 2004 Oct;17(5):340-4.
[Article in Chinese]

Abstract

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: 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.

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.

Publication types

  • English Abstract

MeSH terms

  • Afferent Pathways / physiology
  • Animals
  • Hindlimb Suspension
  • Muscle Spindles / physiology*
  • Muscle, Skeletal / physiology*
  • Neurons, Afferent / physiology
  • Rats
  • Rats, Sprague-Dawley
  • Vibration*
  • Weightlessness Simulation*