Interlimb communication following unexpected changes in treadmill velocity during human walking

Journal of Neurophysiology
Andrew J T StevensonN Mrachacz-Kersting

Abstract

Interlimb reflexes play an important role in human walking, particularly when dynamic stability is threatened by external perturbations or changes in the walking surface. Interlimb reflexes have recently been demonstrated in the contralateral biceps femoris (cBF) following knee joint rotations applied to the ipsilateral leg (iKnee) during the late stance phase of human gait (Stevenson AJ, Geertsen SS, Andersen JB, Sinkjær T, Nielsen JB, Mrachacz-Kersting N. J Physiol 591: 4921-4935, 2013). This interlimb reflex likely acts to slow the forward progression of the body to maintain dynamic stability following the perturbations. We examined this hypothesis by unexpectedly increasing or decreasing the velocity of the treadmill before (-100 and -50 ms), at the same time, or following (+50 ms) the onset of iKnee perturbations in 12 healthy volunteers. We quantified the cBF reflex amplitude when the iKnee perturbation was delivered alone, the treadmill velocity change was delivered alone, or when the two perturbations were combined. When the treadmill velocity was suddenly increased (or decreased) 100 or 50 ms before the iKnee perturbations, the combined cBF reflex was significantly larger (or smaller) than the algebraic sum of the two ...Continue Reading

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Feb 22, 2013·Journal of Neurophysiology·Sabata GervasioNatalie Mrachacz-Kersting
Aug 7, 2013·The Journal of Physiology·Andrew J T StevensonNatalie Mrachacz-Kersting

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Citations

May 15, 2015·The Journal of Physiology·Andrew J T StevensonNatalie Mrachacz-Kersting
Dec 17, 2015·PloS One·Lizeth H SlootJaap Harlaar
Aug 16, 2018·Bioinspiration & Biomimetics·Jacques Duysens, Arturo Forner-Cordero
Nov 7, 2019·Journal of Neurophysiology·David J Maxwell, Demetris S Soteropoulos

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