The aims of the present work was i. to investigate the acute effects of prolonged vibratory stimulation on short-latency stretch reflexes (SLR) of soleus muscle, ii. to assess effects of vibration on parameters of the H-reflex and M-wave stimulus-response curves. There were no changes in the EMG of SLR. During vibration H-reflex amplitudes decreased but H-reflex threshold current increased. None of the H-reflex parameters showed timedependent changes. In contrast, maximum M-wave magnitude (MMAX) decreased after 30min of sustained vibration. The analysis suggests differential effects of presynaptic inhibition on -motoneurons. The vibration parameters have no effect on excitability of afferent and efferent fibers. The depression of the MMAX after vibratory stimulation may be related to neuromuscular transmission failure and/or reduced sarcolemmal excitability.
Knicker, Axel J.; Abdulhafiz, Haitham; and Albracht, Kirsten
"REFLEX RESPONSES TO LOCAL SOLEUS MUSCLE VIBRATION,"
ISBS Proceedings Archive: Vol. 35
, Article 196.
Available at: http://commons.nmu.edu/isbs/vol35/iss1/196