期刊
JOURNAL OF NEUROPHYSIOLOGY
卷 98, 期 3, 页码 1810-1814出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/jn.00562.2007
关键词
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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.
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