Key result
Rhythmic and static contractions of hindlimb muscles in rabbits elicited depressor and pressor reflex responses, respectively, likely activated by metabolites released in the exercising muscles.
Cardiovascular and respiratory responses during exercise are driven by reflexes originating in the contracting muscles, likely mediated by metabolic receptors.
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Animal data on contraction-specific reflexes remain hypothesis-generating; leaves open translation to human exercise hemodynamics and clinical relevance.
Tallarida et al. (1981) studied Anesthetized and deafferented rabbits. Rhythmic and static contractions of hindlimb muscles vs. Sectioned somatic nerves, cut central end of femoral nerve, or intact nerve in curarized animals was evaluated on Systemic blood pressure, heart rate, vascular resistance, and pulmonary ventilation. Rhythmic and static contractions of hindlimb muscles in rabbits elicited depressor and pressor reflex responses, respectively, likely activated by metabolites released in the exercising muscles.
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