PMID: 9843798Dec 9, 1998Paper

Rapid resetting of carotid baroreceptor reflex by afferent input from skeletal muscle receptors

The American Journal of Physiology
J T Potts, J H Mitchell

Abstract

Resetting of the arterial baroreflex is mediated by central (central command) or peripheral (exercise pressor reflex) mechanisms. The purpose of this study was to determine the effect of somatosensory input from skeletal muscle receptors on resetting of the carotid baroreceptor reflex. Resetting of the baroreflex was determined by measuring carotid sinus threshold pressure (Pth) during a ramp protocol that consisted of a linear increase in sinus pressure from 50 to 250 mmHg at approximately 3 mmHg/s. Experiments were performed in seven alpha-chloralose-anesthetized and vagotomized dogs. To determine the effect of skeletal muscle afferent input on resetting, electrically induced muscle contraction was used to activate mechanically and metabolically senstive afferent fibers, whereas passive stretch of the hindlimb was used to activate predominantly mechanically sensitive afferent fibers. Pth for heart rate (HR) and arterial blood pressure (BP) during the control ramp protocol was 110 +/- 4 and 118 +/- 7 mmHg, respectively. Electrically induced muscle contraction increased hindlimb tension (5.7 +/- 0.4 kg) and significantly increased Pth-HR and Pth-BP above control (135 +/- 6 and 141 +/- 5 mmHg, respectively; P < 0.05). Muscle par...Continue Reading

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