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Titolo:
LOW-FREQUENCY ARTERIAL-PRESSURE FLUCTUATIONS DO NOT REFLECT SYMPATHETIC OUTFLOW - GENDER AND AGE-DIFFERENCES
Autore:
TAYLOR JA; WILLIAMS TD; SEALS DR; DAVY KP;
Indirizzi:
HEBREW REHABIL CTR AGED,RES & TRAINING INST,CARDIOVASC RES LAB,BETH ISRAEL DEACONESS MED CTR BOSTON MA 02131 HARVARD UNIV,SCH MED,DIV AGING BOSTON MA 02167 UNIV COLORADO,DEPT KINESIOL BOULDER CO 80309 UNIV COLORADO,HLTH SCI CTR,DEPT MED CARDIOL & GERIATR MED DENVER CO 80262
Titolo Testata:
American journal of physiology. Heart and circulatory physiology
fascicolo: 4, volume: 43, anno: 1998,
pagine: 1194 - 1201
SICI:
0363-6135(1998)43:4<1194:LAFDNR>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
POWER SPECTRAL-ANALYSIS; BLOOD-PRESSURE; HEART-RATE; POSTMENOPAUSAL WOMEN; CONSCIOUS RATS; NERVE ACTIVITY; NITRIC-OXIDE; MAYER WAVES; VARIABILITY; HUMANS;
Keywords:
AUTONOMIC NERVOUS SYSTEM; POWER SPECTRAL ANALYSIS; HEART RATE VARIABILITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
49
Recensione:
Indirizzi per estratti:
Citazione:
J.A. Taylor et al., "LOW-FREQUENCY ARTERIAL-PRESSURE FLUCTUATIONS DO NOT REFLECT SYMPATHETIC OUTFLOW - GENDER AND AGE-DIFFERENCES", American journal of physiology. Heart and circulatory physiology, 43(4), 1998, pp. 1194-1201

Abstract

Low-frequency arterial pressure oscillations (Mayer waves) have been proposed as an index of vascular sympathetic outflow. However, cross-sectional differences in these pressure oscillations may not reflect different levels of sympathetic nervous outflow in humans. Three groups of healthy subjects with characteristically different sympathetic nervous outflow were studied: young females (n = 10, 18-28 yr), young males (n = 11, 18-29 yr), and older males (n = 13, 60-72 yr). Average R-R interval, arterial pressures, and systolic pressure variability at theMayer wave frequency (0.05-0.15 Hz) did not differ among the three groups. Diastolic pressure Mayer wave variability was similar in young females vs. young males (39 +/- 10 vs. 34 +/- 5 mmHg(2)) and lower in older males vs. young males (14 +/- 2 mmHg(2); P < 0.05). In contrast, muscle sympathetic activity was lowest in young females (892 +/- 249 total activity/min) and highest in older males (3,616 +/- 528 total activity/min; both P < 0.05 vs. young males: 2,505 +/- 285 total activity/min). Across the three groups, arterial pressure Mayer wave variability did not correlate with any index of sympathetic activity. Our results demonstrate that arterial pressure Mayer wave amplitude is not a surrogate measure of vascular sympathetic outflow.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 02:38:46