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Titolo:
CARDIOVASCULAR-RESPONSES DURING SPONTANEOUS OVERGROUND LOCOMOTION IN FREELY MOVING DECEREBRATE CATS
Autore:
SADAMOTO T; MATSUKAWA K;
Indirizzi:
NARA WOMENS UNIV,FAC LETTERS,DEPT SPORT SCI,KITAUOYANISHI MACHI NARA 630 JAPAN NATL CARDIOVASC CTR,RES INST,DEPT CARDIAC PHYSIOL SUITA OSAKA 565 JAPAN
Titolo Testata:
Journal of applied physiology
fascicolo: 5, volume: 83, anno: 1997,
pagine: 1454 - 1460
SICI:
8750-7587(1997)83:5<1454:CDSOLI>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
SYMPATHETIC-NERVE ACTIVITY; CAROTID BAROREFLEX; ARTERIAL-PRESSURE; CENTRAL COMMAND; HEART-RATE; EXERCISE; HYPOTHALAMUS; ACTIVATION; INHIBITION; INCREASES;
Keywords:
HEART RATE; ARTERIAL BLOOD PRESSURE; RAPID ADJUSTMENT; CENTRAL CONTROL; SINOAORTIC DENERVATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
T. Sadamoto e K. Matsukawa, "CARDIOVASCULAR-RESPONSES DURING SPONTANEOUS OVERGROUND LOCOMOTION IN FREELY MOVING DECEREBRATE CATS", Journal of applied physiology, 83(5), 1997, pp. 1454-1460

Abstract

To examine whether the cerebrum is essential for producing the rapid cardiovascular adjustment at the beginning of overground locomotion, we examined heart rate (HR), mean arterial blood pressure (MAP), and integrated electromyogram (iEMG) of the forelimb triceps brachialis muscle in freely moving decerebrate cats during locomotion. Two to four days after decerebration surgery performed at the level of the precollicular-premammillary body, the animals spontaneously produced coordinated overground locomotion, supporting body weight. HR began to increase immediately before the onset of iEMG, and MAP began to rise almost simultaneously with the iEMG onset. Their increases in HR and MAP (24 +/-3 beats/min and 22 +/- 4 mmHg) were sustained during locomotion. Sinoaortic denervation (SAD) did not affect the abrupt changes in HR and MAP at the beginning of locomotion (0-4 s from the onset of iEMG), whereas SAD had a contrasting effect during the subsequent period, a decrease in the HR response (9 +/- 1 beats/min) and an increase in the MAP response (30 +/- 3 mmHg). These results suggest that the cerebrum and the rostral part of the diencephalon are not essential for producing the rapid cardiovascular adjustment at the beginning of spontaneous overground locomotion. The arterial baroreflex does not contribute to this rapid adjustment but plays an important role in regulating the cardiovascular responses during the later period of spontaneous locomotion.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 01:29:36