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Titolo:
Assessment of autonomic cardiovascular indices in non-stationary data in rats
Autore:
Neto, EPD; Custaud, MA; Somody, L; Gharib, C;
Indirizzi:
Fac Med Lyon Grange Blanche, Environm Physiol Lab, Equipe Accueil 645, F-69373 Lyon 08, France Fac Med Lyon Grange Blanche Lyon France 08 645, F-69373 Lyon 08, France Hop Cardiovasc & Pneumol Louis Pradel, F-69500 Bron, France Hop Cardiovasc& Pneumol Louis Pradel Bron France F-69500 0 Bron, France
Titolo Testata:
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR AND INTEGRATIVE PHYSIOLOGY
fascicolo: 1, volume: 128, anno: 2001,
pagine: 105 - 115
SICI:
1095-6433(200101)128:1<105:AOACII>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEART-RATE-VARIABILITY; BLOOD-PRESSURE; FREQUENCY; DOMAIN; DISTRIBUTIONS; SERIES;
Keywords:
autonomic nervous system indices; instantaneous frequency; non-stationary data; RR intervals; Wigner-Ville distribution;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Custaud, MA Fac Med Lyon Grange Blanche, Environm Physiol Lab, Equipe Accueil 645, 8 Ave Rockefeller, F-69373 Lyon 08, France Fac Med Lyon Grange Blanche 8 Ave Rockefeller Lyon France 08
Citazione:
E.P.D. Neto et al., "Assessment of autonomic cardiovascular indices in non-stationary data in rats", COMP BIOC A, 128(1), 2001, pp. 105-115

Abstract

The analysis of heart rate in the frequency domain has become increasinglyimportant in physiological studies, and supports the use of heart rate variability as an index of autonomic cardiovascular control. A new index, the instant centre frequency (ICF) has been proposed as a global index of the instantaneous relationship between sympathetic and vagal modulation. The aimof this study was to assess ICF: RR intervals, and heart rate variability measures as indices of sympathovagal balance during a pharmacological blockade of the autonomic nervous system in normotensive rats. RR intervals and arterial blood pressure of 10 conscious Wistar rats equipped with telemetryprobes, were evaluated before, during, and after injection of: (1) saline (190 mul kg(-1) i.v); (2) phentolamine (5 mg kg(-1) i.v.); (3) atropine methyl nitrate (0.5 mg kg(-1) i.v.); and (4) atenolol (1 mg kg-l i.v.). RR interval series were analysed by the smoothed pseudo-Wigner-Ville distribution. A general linearised model was used to evaluate the parameters. ICF was calculated in the same way as the peak power frequency by use of the first moment of instant spectrum. We calculated the ICF of the whole spectrum (ICFT), ICF in high frequency (ICFH) and ICF in low frequency (ICFL). The RR intervals and ICF indexes varied similarly and presented the lowest coefficient of variation among animals exposed to the same autonomic conditions. ICFT-ICFL and ICFH-ICFT were strongly correlated with normalised HF and normalised LF. In normotensive rats, RR intervals and ICF indices may reliably capture the effects of the sympathetic and parasympathetic nervous system on the sinus node. (C) 2001 Elsevier Science Inc All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 19:40:25