Distribution of Ia effects onto human hand muscle motoneurones as revealed using an H reflex technique

The Journal of Physiology
R MazzocchioAlessandro Rossi

Abstract

1. The possibility of eliciting H reflexes in relaxed hand muscles using a collision between the orthodromic impulses generated by magnetic cortical stimulation and the antidromic motor volley due to a supramaximal (SM) peripheral nerve stimulus was investigated in seven subjects. 2. Magnetic stimuli, applied through a circular coil (outer diameter, 13 cm) centred at the vertex, evoking EMG responses of 3-5 mV amplitude in the relaxed abductor digit minimi (ADM) muscle, and SM test stimuli to the ulnar nerve at the wrist producing a direct maximal motor response (Mmax) in the ADM muscle, were given either alone or combined. 3. In all subjects, combined cortical and SM ulnar stimulation produced a response after the Mmax with the latency of an H reflex evoked by the ulnar stimulus. This response occurred only within interstimulus intervals (1-20 ms) compatible with collision in the motor axons. The response behaved like an H reflex being time-locked to the SM ulnar stimulus, facilitated by voluntary activation of ADM muscle, depressed by vibration (4 s, 100 Hz) of ADM tendon and by a submotor-threshold ulnar nerve stimulus applied 50 and 80 ms before the combined stimulation, respectively. 4. In some subjects, it was also possib...Continue Reading

Citations

Nov 2, 2004·Experimental Brain Research·F GinanneschiA Rossi
May 24, 2005·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·W J Z'GraggenK M Rösler
May 30, 2002·Neuroscience and Biobehavioral Reviews·Geoffrey Hammond
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Apr 18, 2015·Cerebral Cortex·Florent LebonRichard B Ivry
Apr 20, 2004·Anatomical Science International·Akira Naito
Jan 27, 2006·Journal of Neurophysiology·Birgit Larsen, Michael Voigt
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Aug 31, 2012·Journal of Neurophysiology·Alessandro RossiFederica Ginanneschi
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Dec 6, 2014·Journal of Applied Physiology·Jakob L DideriksenDario Farina
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