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Objective:Muscle tone abnormalities are one of the main problems of patients with central nervous system disease. There are several methods to normalize muscle tone. One of them is vibration therapy. Applying vibration to different parts of a muscle may display different responses, but the differences have not yet been studied. The aim of this study was to evaluate these potential differences. Material and Methods: Participants were twelve healthy men. All participants took part in four experiments, twice as control and twice as experiment group. In the experiment group, vibrator (frequency: 100 Hz, amplitude: 1.6 mm) was applied to the bulk of soleus for 1 min in one session and to the tendon in another session. In the control group, the inoperative vibrator was put on the same landmarks on the bulk and tendon of the muscle so as to have the same pressure and tactile stimuli. Results: Statistical analysis showed that vibration applied to the bulk and tendon of soleus enhanced the positive slope and threshold of the H-reflex recruitment curve. Conclusion: Applying vibration with these parameters increased the recruitment of fast and slow motor neurons. Apart from enhanced motor neuron recruitment, the inhibitory action of Renshaw cells declined because of supraspinal and segmental effects.

Effect of Tendon and Bulk Vibration of The Soleus Muscle on the Threshold and Positive Slope of the H-Reflex Recruitment Curve