HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) All Versions of this Article: 98/3/1810    most recent 00562.2007v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via ISI Web of Science (1) Citing Articles via Google Scholar Google Scholar Articles by Zehr, E. P. Articles by Phadke, C. Search for Related Content PubMed PubMed Citation Articles by Zehr, E. P. Articles by Phadke, C.

REPORT

Enhancement of Arm and Leg Locomotor Coupling With Augmented Cutaneous Feedback From the Hand

¹Rehabilitation Neuroscience Laboratory and ²Centre for Biomedical Research, University of Victoria, Victoria, British Columbia and ³Human Discovery Science, International Collaboration on Repair Discoveries, Vancouver, British Columbia, Canada; ⁴Departments of Physical Therapy and Neuroscience, University of Florida, Gainesville and ⁵Brain Rehabilitation Research Center, Rehabilitation Research and Development Service, Malcom Randall Veterans Affairs Medical Center, Gainesville, Florida

Submitted 20 May 2007; accepted in final form 24 June 2007

Cutaneous feedback from the hand could assist with coordination between the arms and legs during locomotion. Previously we used a reduced walking model of combined arm and leg (ARM&LEG) cycling to examine the separate effects of rhythmic arm (ARM) and leg (LEG) movement. Here we use this same paradigm to test the modulation H-reflexes with and without interlimb cutaneous conditioning evoked by stimulating a nerve innervating the hand (superficial radial, SR). It was hypothesized that both ARM and LEG would contribute significantly to suppression of H-reflex amplitude during ARM&LEG. We also predicted a conservation of interlimb cutaneous conditioning during movement and an interaction between arm and leg rhythmic movement control. Subjects were seated in a recumbent ARM&LEG cycle ergometer and maintained a low-level soleus contraction for all tasks. H-reflex amplitude was facilitated by cutaneous conditioning evoked by stimulation of the SR nerve. H-reflex amplitudes were taken from recruitment curves and included modulation of 50% H_max and H_max. The suppressive effect of ARM was less than that for LEG and ARM&LEG, while suppression during LEG and ARM&LEG were generally equivalent. For H-reflexes conditioned by cutaneous input, amplitudes during ARM&LEG instead were in between those for ARM and LEG modulation. Multiple regression analysis revealed a significant contribution for ARM only in trials when SR stimulation was used to condition H-reflex amplitudes. We suggest that there is a measurable interaction between neural activity regulating arm and leg movement during locomotion that is specifically enhanced when cutaneous input from the hand is present.