Key result
Rhythmic muscle contraction induces hypotension while tetanic contraction drives sympathetic hypertension and vasoconstriction.
Demonstrates that rhythmic and tetanic muscular contractions induce opposite reflexogenic cardiovascular responses mediated by somatic afferent and sympathetic efferent nerves.
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Animal findings on contraction-type reflexes merit caution in procedural or exercise contexts; leaves open human translation and mechanistic validation.
In anesthetized dogs, contraction of the muscles of the thigh was elicited either by applying electrodes in the muscles or by stimulation of the spinal ventral roots. The carotid sinuses were isolated; the vagi and the depressor nerves cut. Rhythmic muscular contraction caused hypotension and vasodilatation; tetanic contraction caused hypertension and vasoconstriction. These responses are of reflexogenic origin: the afferent pathway is in the somatic nerves, the efferent pathway in the sympathetic nerves.
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L. Clément (2008) studied this question. Rhythmic and tetanic muscular contraction was evaluated on Blood pressure and vascular tone. Rhythmic muscular contraction caused hypotension and vasodilatation, whereas tetanic contraction caused hypertension and vasoconstriction via somatic afferent and sympathetic efferent nerves.
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