Security of driving of Ia afferents by vibration that simultaneously elicits a tonic vibration reflex
Experiments were performed in the decerebrate cat to test how well the soleus Ia fibres are driven 1:1 by vibration (150 Hz, 50μm pulses, combined with a 1 mm stretch) in the presence of a tonic vibration reflex, with particular reference as to whether any phasic Ia ‘misbehaviour’ could be responsible for the tremor seen in the reflex contraction. In order to keep the reflex arc intact the unitary recording was performed by means of a capillary glass micro-electrode inserted into the soleus nerve. In general, driving proved to be remarkably secure in spite of the unloading and any other effects of the reflex contraction, and it is concluded that the tremor in the reflex tension, recorded isometrically, is not attributable to oscillatory stretch reflex activity.
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- Clark, F. J., Matthews, P. B. C. and Muir, R. B. (1981a). Response of soleus Ia afferents to vibration in the presence of the tonic vibration reflex in the decerebrate cat, J. Physiol., Lond., to be publishedGoogle Scholar
- Clark, F. J., Matthews, P. B. C. and Muir, R. B. (1981b). Motor unit firing and its relation to tremor in the tonic vibration reflex of the decerebrate cat, J. Physiol., Lond., to be publishedGoogle Scholar