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The pressor reflex evoked by skeletal muscle contraction and its effect on the reflex from the sino aortal baro receptive areas


Fiziologicheskii Zhurnal SSSR Imeni I M Sechenova 62(5): 731-739
The pressor reflex evoked by skeletal muscle contraction and its effect on the reflex from the sino aortal baro receptive areas
The cardiovascular response to 10 s tetanic muscular contractions was studied in the decerebrated cat. A pressor reflex of about 30 mm Hg occurred during hindlimb contractions evoked by ventral root (L6, L7, S1) stimulation. The pressor reflex was associated with a decrease of blood flow in working and resting muscles and minimal change of heart rate and left ventricular contractility. An increase of systemic resistance as a main cause of pressor reflex is suggested. Static contractions of muscles and stimulation of muscle nerve evoked stronger inhibition of baroreflex than cutaneous nerve stimulation or nociceptive stimuli. Inhibition of the cardiac component of baroreflex during muscular exercise was shown.


Accession: 006740046



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