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Journal of Neuroscience, Vol 6, 1308-1313, Copyright © 1986 by Society for Neuroscience
Amplitude modulation of the soleus H-reflex in the human during walking and standing
C Capaday and RB Stein
Experiments were done to determine the amplitude of the monosynaptically
mediated H-reflex of the soleus muscle at various phases of the step cycle,
using a computer-based analysis procedure. In all subjects tested the
amplitude of the H-reflex was strongly modulated in amplitude during the
walking cycle and was highest during the stance phase. In many subjects the
peak reflex amplitude occurred at about the same time as the peak soleus
electromyographic (EMG) activity, but in others it occurred earlier. The
form of the reflex variation (i.e., envelope of H-reflex amplitude versus
phase in cycle) during the step cycle could also be quite different from
that of the EMG produced during stepping. At an equal stimulus strength and
EMG level, the H-reflex was always much larger, up to 3.5 X, during
steadily maintained contractions while standing than during walking. The
large reflexes when subjects were standing are consistent with the control
of position required to maintain a stable posture in this task. Similarly,
the reflexes during walking are greatest during the stance phase, when they
will assist in maintaining the upright position of the body against
gravity. The reflexes are smallest during the swing phase when they would
oppose ankle flexion. However, since the reflex amplitude is task-dependent
(i.e., greater during standing than during walking at the same EMG and
stimulus levels) and is not always closely related to the EMG produced
during a given task such as walking, the strong modulation of H-reflex
during walking is not simply a passive consequence of the alpha-motoneuron
excitation level.(ABSTRACT TRUNCATED AT 250 WORDS)
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