[The pressor reflex induced by skeletal muscle contraction and its influence on the reflex from the sino-aortic zones].
The cardiovascular response to 10 sec tetanic muscular contractions was studied in the decerebrated cat. A pressor reflex about 30 mm Hg occurred during hindlimb contractions evoked by ventral roots (L6, L7, S1) stimulation. The pressor reflex was associated with a decrease of blood flow in working and resting muscles and a minimal changes 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 of nociceptive stimuli. Inhibition of the cardiac component of baroreflex during muscular exercise was shown.
D000818:Animals; D001794:Blood Pressure; D002415:Cats; D003655:Decerebrate State; D006321:Heart / Q000502:physiology; D009119:Muscle Contraction; D010146:Pain; D010525:Peripheral Nerves / Q000502:physiology; D012018:Reflex; D012867:Skin / Q000294:innervation; D013126:Spinal Nerve Roots / Q000502:physiology; D014630:Vagus Nerve / Q000502:physiology; D014655:Vascular Resistance
Pressornyĭ refleks, vyzvannyĭ sokrashcheniem skeletnykh myshts, i ego vliianie na refleks s sino-aortal'nykh baroretseptivnykh zon