Bilateral Reflex Fluctuations during Rhythmic Movement of Remote Limb Pairs

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dc.contributor.authorMezzarane, Rinaldo A.
dc.contributor.authorNakajima, Tsuyoshi
dc.contributor.authorZehr, E. Paul
dc.date.accessioned2018-09-07T21:09:34Z
dc.date.available2018-09-07T21:09:34Z
dc.date.copyright2017en_US
dc.date.issued2017
dc.description.abstractThe modulation of spinal cord excitability during rhythmic limb movement reflects the neuronal coordination underlying actions of the arms and legs. Integration of network activity in the spinal cord can be assessed by reflex variability between the limbs, an approach so far very little studied. The present work addresses this question by eliciting Hoffmann (H-) reflexes in both limbs to assess if common drive onto bilateral pools of motoneurons influence spinal cord excitability simultaneously or with a delay between sides. A cross-covariance (CCV) sequence between reflexes in both arms or legs was evaluated under conditions providing common drive bilaterally through voluntary muscle contraction and/or rhythmic movement of the remote limbs. For H- reflexes in the flexor carpi radialis (FCR) muscle, either contraction of the FCR or leg cycling induced significant reduction in the amplitude of the peak at the zero lag in the CCV sequence, indicating independent variations in spinal excitability between both sides. In contrast, for H- reflexes in the soleus (SO) muscle, arm cycling revealed no reduction in the amplitude of the peak in the CCV sequence at the zero lag. This suggests a more independent control of the arms compared with the legs. These results provide new insights into the organization of human limb control in rhythmic activity and the behavior of bilateral reflex fluctuations under different motor tasks. From a functional standpoint, changes in the co-variability might reflect dynamic adjustments in reflex excitability that are subsumed under more global control features during locomotion.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipRAM was supported by grants from Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq; 476830/2013-3); Fundacao de Amparo a Pesquisa do Distrito Federal (FAPDF; 193.001.010/2015); CAPES; and a fellowship from the Canadian Bureau for International Education (PDRF Program). EPZ was supported by a Discovery Grant from the Natural Sciences and Engineering Research Council of Canada.en_US
dc.identifier.citationMezzarane, R.A.; Nakajima, T.; & Zehr, E.P. (2017). Bilateral reflex fluctuations during rhythmic movement of remote limb pairs. Frontiers in Human Neuroscience, 11, article 355. DOI:10.3389/fnhum.2017.00355en_US
dc.identifier.urihttps://doi.org/10.3389/fnhum.2017.00355
dc.identifier.urihttp://hdl.handle.net/1828/10045
dc.language.isoenen_US
dc.publisherFrontiers in Human Neuroscienceen_US
dc.subjectcross-covarianceen_US
dc.subjectvariabilityen_US
dc.subjectH-reflexen_US
dc.subjecthumanen_US
dc.subjectspinal corden_US
dc.titleBilateral Reflex Fluctuations during Rhythmic Movement of Remote Limb Pairsen_US
dc.typeArticleen_US

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