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Titolo:
SINOAORTIC DENERVATION PREVENTS POSTEXERCISE REDUCTIONS IN ARTERIAL-PRESSURE AND CARDIAC SYMPATHETIC TONUS
Autore:
CHANDLER MP; DICARLO SE;
Indirizzi:
NE OHIO UNIV,COLL MED,DEPT PHYSIOL,4209 STATE ROUTE 44,POB 95 ROOTSTOWN OH 44272 NE OHIO UNIV,COLL MED,DEPT PHYSIOL ROOTSTOWN OH 44272
Titolo Testata:
American journal of physiology. Heart and circulatory physiology
fascicolo: 6, volume: 42, anno: 1997,
pagine: 2738 - 2745
SICI:
0363-6135(1997)42:6<2738:SDPPRI>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
BLOOD-PRESSURE; HYPERTENSIVE RATS; ACUTE EXERCISE; DYNAMIC EXERCISE; BAROREFLEX FUNCTION; CAROTID BAROREFLEX; CONSCIOUS RABBIT; AFFERENT INPUTS; SCIATIC-NERVE; HYPOTENSION;
Keywords:
SYMPATHETIC TONUS; PARASYMPATHETIC TONUS; SPONTANEOUSLY HYPERTENSIVE RATS; ARTERIAL BAROREFLEX; POSTEXERTIONAL HYPOTENSION;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
M.P. Chandler e S.E. Dicarlo, "SINOAORTIC DENERVATION PREVENTS POSTEXERCISE REDUCTIONS IN ARTERIAL-PRESSURE AND CARDIAC SYMPATHETIC TONUS", American journal of physiology. Heart and circulatory physiology, 42(6), 1997, pp. 2738-2745

Abstract

Arterial pressure, cardiac sympathetic tonus (ST), and heart rate (HR) are reduced after a single bout of dynamic exercise in spontaneouslyhypertensive rats (SHR). To test if the arterial baroreflex is required for these postexercise responses, intact (n = 9) and sinoaortic-denervated (SAD) rats (n = 5) were chronically instrumented with an arterial catheter for the measurement of arterial pressure and HR and for the infusion of cardiac autonomic antagonists. Five days after instrumentation, cardiac ST and parasympathetic tonus (PT) were determined under two experimental conditions (no exercise and postexercise). SAD rats did not alter no-exercise cardiac ST (intact 47 +/- 3 vs. SAD 50 +/-3 beats/min); however, no-exercise PT was reduced (intact -24 +/- 2 vs. SAD -4 +/- 4 beats/min, P < 0.05). Acute exercise reduced arterial pressure (postexertional hypotension, -20 +/- 3 mmHg, P < 0.05), cardiac ST (no exercise 47 +/- 3 vs. postexercise 24 +/- 3 beats/min, P < 0.05), and PT (no exercise -24 +/- 2 vs. postexercise -11 +/- 2 beats/min, P < 0.05) in intact SHR. In contrast, SAD prevented postexercise reductions in arterial pressure and cardiac ST (no exercise 50 +/- 3 vs. postexercise 59 +/- 7 beats/min). Furthermore, SAD had no effect on postexercise PT (no exercise -4 +/- 4 vs. postexercise -7 +/- 4 beats/min). These results demonstrate that the arterial baroreflex is required for the reduction in arterial pressure and cardiac ST that occurs in SHR after a single bout of dynamic exercise.

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Documento generato il 03/12/20 alle ore 12:49:13