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The Journal of Neurophysiology Vol. 85 No. 3 March 2001, pp. 1178-1184
Copyright ©2001 by the American Physiological Society
1Neurophysiology Laboratory, Faculty of Physical Education and Recreation, University of Alberta, Edmonton, Alberta T6G 2H9; and 2Laboratory for Perceptual-Motor Dynamics, School of Human Kinetics, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
Zehr, E. Paul,
Kathryn
L. Hesketh, and
Romeo Chua.
Differential Regulation of Cutaneous and H-Reflexes During Leg
Cycling in Humans. J. Neurophysiol. 85: 1178-1184, 2001. Reflexes undergo modulation according to task and
timing during standing, walking, running, and leg cycling in humans.
Both cutaneous and Hoffman (H-) reflexes are modulated by movement and
task. However, recent evidence suggests that the modulation pattern for
cutaneous and H-reflexes may be different. We sought to clarify this
issue by reducing the effect of movement phase and altering the level
of background muscle activation (low and high) in static and dynamic
(leg cycling) conditions. Electromyography was recorded from the ankle
extensors soleus and medial gastrocnemius (MG) and the knee extensor
vastus lateralis (VL). Reflexes were evoked during the downstroke of
stationary leg cycling. Cutaneous reflexes were evoked with trains of
5 × 1.0 ms pulses at 300 Hz delivered to the distal tibial nerve,
whereas H-reflexes were evoked in soleus by stimulation with single
1.0-ms pulses. There were two main observations in this study:
1) middle latency cutaneous reflexes were facilitatory
during static contraction but were dramatically attenuated or reversed
to suppressive responses during cycling (task-dependent modulation);
2) soleus H-reflexes were larger in the high muscle
activation condition but were unaffected by task (no task-dependent
modulation). Thus opposite results were obtained in the two reflex
pathways. It is concluded that cutaneous and H-reflexes are modulated
by different mechanisms during active locomotor-like movements.
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