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Titolo:
EFFECTS OF ACUTE HYPERTHERMIA ON THE CAROTID BAROREFLEX CONTROL OF HEART-RATE IN HUMANS
Autore:
YAMAZAKI F; SAGAWA S; TORII R; ENDO Y; SHIRAKI K;
Indirizzi:
UNIV OCCUPAT & ENVIRONM HLTH,SCH MED,DEPT PHYSIOL,YAHATANISHI KU,1-1 ISEIGAOKA KITAKYUSHU FUKUOKA 807 JAPAN UNIV OCCUPAT & ENVIRONM HLTH,SCH MED,DEPT PHYSIOL,YAHATANISHI KU KITAKYUSHU FUKUOKA 807 JAPAN
Titolo Testata:
International journal of biometeorology
fascicolo: 4, volume: 40, anno: 1997,
pagine: 200 - 205
SICI:
0020-7128(1997)40:4<200:EOAHOT>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
BARORECEPTOR-CARDIAC REFLEX; SPECTRAL-ANALYSIS; RATE-VARIABILITY; HUMAN VAGAL; RESPONSES; MODULATION; DURATION; HYPOXIA; BABOONS;
Keywords:
CAROTID SINUS BARORECEPTORS; R-R INTERVALS; REFERENCE POINT; POWER SPECTRA; HEAT STRESS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
F. Yamazaki et al., "EFFECTS OF ACUTE HYPERTHERMIA ON THE CAROTID BAROREFLEX CONTROL OF HEART-RATE IN HUMANS", International journal of biometeorology, 40(4), 1997, pp. 200-205

Abstract

The purpose of this study was to examine the effect of hyperthermia on the carotid baroreceptor-cardiac reflexes in humans. Nine healthy males underwent acute hyperthermia (esophageal temperature similar to 38.0 degrees C) produced by hot water-perfused suits. Beat-to-beat heartrate (HR) responses were determined during positive and negative R-wave-triggered neck pressure steps from +40 to -65 mm Hg during normothermia and hyperthermia. The carotid baroreceptor-cardiac reflex sensitivity was evaluated from the maximum slope of the HR response to changes in carotid distending pressure. Buffering capacity of the HR response to carotid distending pressure was evaluated in % from a reference point calculated as (HR at 0 mm Hg neck pressure-minimum HR)/HR range x100. An upward shift of the curve was evident in hyperthermia because HR increased from 57.7+/-2.4 beats/min in normothermia to 88.7+/-4.1 beats/min in hyperthermia (P < 0.05) without changes in mean arterial pressure. The maximum slope of the curve in hyperthermia was similar tothat in normothermia. The reference point was increased (P < 0.05) during hyperthermia. These results suggest that the sensitivity of the carotid baroreflex of HR remains unchanged in hyperthermia. However, the capacity for tachycardia response to rapid onset of hypotension is reduced and the capacity for bradycardia response to sudden hypertension is increased during acute hyperthermia.

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Documento generato il 11/07/20 alle ore 07:33:00