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Division of Cardiovascular Medicine, Departments of Internal Medicine and Human Physiology, University of California, Davis, California 95616
Received 11 November 1996; accepted in final form 3 February 1997.
Adreani, Christine M., Janeen M. Hill, and Marc P. Kaufman.
Responses of group III and IV muscle afferents to dynamic exercise. J. Appl. Physiol. 82(6):
1811-1817, 1997.
Tetanic contraction of hindlimb skeletal muscle,
induced by electrical stimulation of either ventral roots or peripheral
nerves, is well known to activate group III and IV afferents.
Nevertheless, the effect of dynamic exercise on the discharge of these
thin fiber afferents is unknown. To shed some light on this question,
we recorded in decerebrate cats the discharge of 24 group III and 10 group IV afferents while the mesencephalic locomotor region (MLR) was
stimulated electrically. Each of the 34 afferents had their receptive
fields in the triceps surae muscles. Stimulation of the MLR for 1 min caused the triceps surae muscles to contract rhythmically, an effect
induced by an
-motoneuron discharge pattern and recruitment order
almost identical to that occurring during dynamic exercise. Eighteen of
the 24 group III and 8 of the 10 group IV muscle afferents were
stimulated by MLR stimulation. The oxygen consumption of the
dynamically exercising triceps surae muscles was increased by 2.5-fold
over their resting levels. We conclude that low levels of dynamic
exercise stimulate group III and IV muscle afferents.
mesencephalic locomotor region; reflex control of the circulation; C fibers; A
fibers; autonomic nervous system
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