'Direct' and 'crossed' modulation of human motor cortex excitability following exercise
作者： Claudio Bonato , Giampietro Zanette , Paolo Manganotti , Michele Tinazzi , Giuseppe Bongiovanni
DOI: 10.1016/0304-3940(96)13010-X
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摘要: Rapid repetitive movements of the thumb (1 min duration) produce a reversible decrease in activated primary motor cortex (MI) excitability to transcranial magnetic stimulation (TMS) with recovery within 35–40 min. In present study we investigated (1) role peripheral sensory feedback inducing such and (2) possible effects exercise on non-activated MI. Stimulation Ia afferent fibres, induced by 1 vibration thenar muscles 2 Hz electrical median nerve at wrist, have no effect evoked potential (MEP) amplitude TMS suggesting for MI modulation. Exercise produces significant (P < 0.01) MEPs homologous non-exercised concomitant contraction corresponding cortical output maps, that changes also occur hemisphere. This ‘crossed’ might relate an interhemispheric transfer information, via homotopic connections corpus callosum.
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