Effect of vibration of the ankle stretch reflex in man

Electroencephalography and Clinical Neurophysiology
G C Agarwal, G L Gottlieb

Abstract

Vibration at frequencies above 50 Hz applied to the tendon of the extensor muscles of the ankle joint produce the tonic vibration reflex (TVR) which increases when the vibration frequency is increased. The TVR affects a joint's mechanical response to sinusoidal and random oscillations in a manner similar to that seen with tonic voluntary contraction. Although the myotatic reflex is suppressed by vibration, repeated stretches of sinusoidal oscillation produce an average EMG response which is not different in magnitude from the no vibration case. Either polysynaptic mechanisms at the spinal cord level of mechanisms involving higher centers (and possibly both) are able to overcome the inhibitory mechanisms at the Ia-alpha motoneuron level in producing a stretch evoked resonance near 6 Hz. The degree of inhibition of the myotatic component of the stretch reflex is proportional to the vibration frequency. This is in contrast to the facilitation of the myotatic reflex produced by tonic voluntary contraction. Vibration does not seem to influence the post-myotatic component (> 100 msec) of the stretch reflex. These results indicate that the post-myotatic responses to limb perturbation are not only different in their latency but also in...Continue Reading

References

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Citations

Nov 15, 2000·IEEE Transactions on Bio-medical Engineering·E J PerreaultR F Kirsch
Feb 1, 1989·Experimental Neurology·M L LatashG L Gottlieb
Jan 13, 2010·The Journal of Physiology·Abraham T ZuurMarkus Gruber
Apr 26, 2013·Journal of Neurophysiology·Tanya OnushkoBrian D Schmit

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