In 12 subjects, each sitting on an armchair with the right forearm prone, the H-reflex elicited in the resting flexor carpi radialis muscle underwent cyclic excitability changes correlated with rhythmic flexion-extension movements of the ipsilateral foot (frequency of oscillations between 1.5 and 2.5 Hz). During foot plantar flexion, the H-reflex underwent a clear-cut increase, the maximum facilitation falling, in most subjects, within the second half of that phase: then, a gradual reduction in size led the reflex amplitude back to the initial value at the end of foot dorsal extension. If present also when the wrist and the ankle are moved together, this facilitation should favour the in-phase (isodirectional) association between movements and, conversely, hinder the anti-phase coupling.

Cyclic modulation of the H-reflex in a wrist flexor during rhythmic flexion-extension movements of the ipsilateral foot / F. Baldissera, P. Cavallari, L. Leocani. - In: EXPERIMENTAL BRAIN RESEARCH. - ISSN 0014-4819. - 118:3(1998), pp. 427-430.

Cyclic modulation of the H-reflex in a wrist flexor during rhythmic flexion-extension movements of the ipsilateral foot

F. Baldissera;P. Cavallari;
1998

Abstract

In 12 subjects, each sitting on an armchair with the right forearm prone, the H-reflex elicited in the resting flexor carpi radialis muscle underwent cyclic excitability changes correlated with rhythmic flexion-extension movements of the ipsilateral foot (frequency of oscillations between 1.5 and 2.5 Hz). During foot plantar flexion, the H-reflex underwent a clear-cut increase, the maximum facilitation falling, in most subjects, within the second half of that phase: then, a gradual reduction in size led the reflex amplitude back to the initial value at the end of foot dorsal extension. If present also when the wrist and the ankle are moved together, this facilitation should favour the in-phase (isodirectional) association between movements and, conversely, hinder the anti-phase coupling.
H-reflex; Human; Interlimb coordination; Voluntary movement
Settore BIO/09 - Fisiologia
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/731429
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