| Selective bilateral activation of leg muscles after cutaneous nerve stimulation during backward walking. | |
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MedLine Citation:
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PMID: 22773779 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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During human locomotion, cutaneous reflexes have been suggested to function to preserve balance. Specifically, cutaneous reflexes in the contralateral leg's muscles (with respect to the stimulus) were suggested to play an important role in maintaining stability during locomotor tasks where stability is threatened. We used backward walking (BW) as a paradigm to induce unstable gait and analyzed the cutaneous reflex activity in both ipsilateral and contralateral lower limb muscles. Thirteen healthy participants walked at 4.0 km/hr both forwards and backwards on a treadmill. We recorded electromyography (EMG) for three muscles in both legs: the tibialis anterior (TA), medial gastrocnemius (MG) and biceps femoris (BF). We elicited cutaneous reflexes by electrical stimulation of the sural nerve of the right leg at different phases of the gait cycle. We calculated short term maximum Lyapunov exponents and step width based on the center of pressure. These were higher for BW compared to forward walking, indicating that BW is less stable. In BW, TA reflex activity in the contralateral leg during its stance phase was markedly higher than TA background EMG activity. In addition, in BW substantial reflex suppression was observed in the ipsilateral BF during the stance-swing transition in some participants, while for MG the reflex activity was equal to background activity in both legs. Reflex activity in BW was uncorrelated to stability and anthropometric measures; no support was found for the proposal that reduced stability was the reason for the increased crossed responses in TA during BW. |
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Authors:
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Wouter Hoogkamer; Firas Massaad; Karen Jansen; Sjoerd M Bruijn; Jacques Duysens |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-7-5 |
Journal Detail:
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Title: Journal of neurophysiology Volume: - ISSN: 1522-1598 ISO Abbreviation: - Publication Date: 2012 Jul |
Date Detail:
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Created Date: 2012-7-9 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0375404 Medline TA: J Neurophysiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1KU Leuven. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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