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Am J Physiol Regul Integr Comp Physiol 281: R1127-R1133, 2001;
0363-6119/01 $5.00
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Vol. 281, Issue 4, R1127-R1133, October 2001

Comparison of the exercise pressor reflex between forelimb and hindlimb muscles in cats

Naoyuki Hayashi, Shawn G. Hayes, and Marc P. Kaufman

Departments of Internal Medicine, Divisions of Cardiovascular Medicine and Human Physiology, University of California, Davis, California 95616

In thirteen cats anesthetized with alpha -chloralose, we compared the cardiovascular and ventilatory responses to both static contraction and tendon stretch of a hindlimb muscle group, the triceps surae, with those to contraction and stretch of a forelimb muscle group, the triceps brachii. Static contraction and stretch of both muscle groups increased mean arterial pressure and heart rate, and the responses were directly proportional to the developed tension. The cardiovascular increases, however, were significantly greater (P < 0.05) when the triceps brachii muscles were contracted or stretched than when the triceps surae muscles were contracted or stretched, even when the tension developed by either maneuver was corrected for muscle weight. Likewise, the ventilatory increases were greater when the triceps brachii muscles were stretched than when the triceps surae muscles were stretched. Contraction of either muscle group did not increase ventilation. Our results suggest that in the anesthetized cat the cardiovascular responses to both static contraction and tendon stretch are greater when arising from forelimb muscles than from hindlimb muscles.

static muscular contraction; group III and IV afferents; cardiovascular control; respiratory control


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