Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Thermal stress modulates arterial pressure variability and arterial baroreflex response of heart rate during head-up tilt in humans
Autore:
Yamazaki, F; Sone, R;
Indirizzi:
Univ Occupat & Environm Hlth, Sch Hlth Sci, Dept Clin Pathophysiol, Yahatanishi Ku, Kitakyushu, Fukuoka 8078555, Japan Univ Occupat & Environm Hlth Kitakyushu Fukuoka Japan 8078555 8555, Japan Yamaguchi Univ, Fac Educ, Dept Exercise & Hlth Sci, Yamaguchi 7530841, Japan Yamaguchi Univ Yamaguchi Japan 7530841 lth Sci, Yamaguchi 7530841, Japan
Titolo Testata:
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 4, volume: 84, anno: 2001,
pagine: 350 - 357
SICI:
1439-6319(200104)84:4<350:TSMAPV>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
SYMPATHETIC-NERVE ACTIVITY; BLOOD-PRESSURE; ORTHOSTATIC STRESS; SPECTRAL-ANALYSIS; FLUCTUATIONS; RESPIRATION; SENSITIVITY; TEMPERATURE; INSIGHTS; SYNCOPE;
Keywords:
arterial pressure; power spectrum analysis; baroreflex; thermal stress; head-up tilt;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Yamazaki, F Univ Occupat & Environm Hlth, Sch Hlth Sci, Dept Clin Pathophysiol, Yahatanishi Ku, 1-1 Iseigaoka, Kitakyushu, Fukuoka 8078555, Japan Univ Occupat & Environm Hlth 1-1 Iseigaoka Kitakyushu Fukuoka Japan 8078555
Citazione:
F. Yamazaki e R. Sone, "Thermal stress modulates arterial pressure variability and arterial baroreflex response of heart rate during head-up tilt in humans", EUR J A PHY, 84(4), 2001, pp. 350-357

Abstract

To examine the effects of thermal stress on the blood pressure variabilityand the arterial baroreceptor-cardiac reflex during orthostatic stress, 11male volunteers underwent whole body thermal stress using a cool or hot water-perfused suit during 5 min of 70 degrees head-up tilt (HUT). The spontaneous variability in arterial pressure was quantified by power spectrum analysis. The sensitivity of the arterial baroreceptor-cardiac reflex was calculated from the spontaneous changes in beat-to-beat arterial pressure and heart rate (f(c)). During supine rest the variability of arterial pressure decreased during cooling, while it remained unchanged during heating. The variability increased with HUT; it was greater (P < 0.05) with heating than with cooling. In the supine condition, the arterial baroreflex sensitivity of f(c) increased during cooling, while it did not change during heating. The sensitivities decreased (P < 0.05) with HUT during both thermal stresses;the decreased rate of sensitivity from the pre-tilt value was greater during heating [mean 63 (SEM 4)%] and smaller during cooling [mean 11 (SEM 24)%] than during normothermia [mean 47 (SEM 4)%] (both, P < 0.05). There were significant negative correlations between the sensitivities and the amplitude of the arterial pressure variability during normothermia and heating (P < 0.0001). The results suggest that the spontaneous baroreflex response off, is a modulatory factor for the changes of arterial pressure variability brought about by thermal stress during orthostatic stress.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/04/20 alle ore 17:57:09