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Titolo:
Inconsistent link between low-frequency oscillations: R-R interval responses to augmented Mayer waves
Autore:
Hamner, JW; Morin, RJ; Rudolph, JL; Taylor, JA;
Indirizzi:
Hebrew Rehabil Ctr Aged, Res & Training Inst, Lab Cardiovasc Res, Boston, MA 02131 USA Hebrew Rehabil Ctr Aged Boston MA USA 02131 asc Res, Boston, MA 02131 USA Harvard Univ, Sch Med, Div Aging, Boston, MA 02131 USA Harvard Univ Boston MA USA 02131 Sch Med, Div Aging, Boston, MA 02131 USA
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 4, volume: 90, anno: 2001,
pagine: 1559 - 1564
SICI:
8750-7587(200104)90:4<1559:ILBLOR>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
BLOOD-PRESSURE VARIABILITY; CENTRAL VENOUS-PRESSURE; SHORT-TERM VARIABILITY; HEART-RATE; VASOCONSTRICTOR RESPONSES; SPECTRAL-ANALYSIS; HUMANS; REPRODUCIBILITY; BARORECEPTORS; FLUCTUATIONS;
Keywords:
arterial blood pressure; power spectral analysis; oscillatory lower body negative pressure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Taylor, JA Hebrew Rehabil Ctr Aged, Res & Training Inst, Lab Cardiovasc Res, 1200 CtrSt, Boston, MA 02131 USA Hebrew Rehabil Ctr Aged 1200 Ctr St Boston MA USA 02131 131 USA
Citazione:
J.W. Hamner et al., "Inconsistent link between low-frequency oscillations: R-R interval responses to augmented Mayer waves", J APP PHYSL, 90(4), 2001, pp. 1559-1564

Abstract

Low-frequency oscillations in arterial blood pressure (Mayer waves) and R-R interval are thought to be linked through the arterial baroreflex. To delve into this relationship, we applied low (10 mmHg) and moderate (30 mmHg) lower body negative pressure (LBNP) in 10-s cycles to 18 healthy young malesubjects. They showed no change in average blood pressure with this oscillatory stimulus but did show a significant decrease in R-R interval (P < 0.05) during both levels of LBNP. In addition, we succeeded in augmenting low-frequency blood pressure oscillations in a graded response to oscillatory LBNP level (P < 0.05) while significantly increasing low-frequency R-R interval oscillations (P < 0.05). However, cross-spectral coherence between these increased oscillations was highly variable across individuals and stimulus level. Although nearly all subjects showed significant coherence during basal conditions (n = 17), only seven subjects maintained significant coherence during both levels of LBNP. These results suggest that a complex interaction of regulatory mechanisms determines the link between low-frequency oscillations and the responses to even low levels of LBNP.

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Documento generato il 02/10/20 alle ore 01:22:35