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Titolo:
Effects of human pregnancy on cardiac autonomic function above and below the ventilatory threshold
Autore:
Avery, ND; Wolfe, LA; Amara, CE; Davies, GAL; McGrath, MJ;
Indirizzi:
Queens Univ, Sch Phys & Hlth Educ, Kingston, ON K7L 3N6, Canada Queens Univ Kingston ON Canada K7L 3N6 Educ, Kingston, ON K7L 3N6, Canada Queens Univ, Dept Obstet & Gynaecol, Kingston, ON K7L 3N6, Canada Queens Univ Kingston ON Canada K7L 3N6 ecol, Kingston, ON K7L 3N6, Canada Queens Univ, Dept Physiol, Kingston, ON K7L 3N6, Canada Queens Univ Kingston ON Canada K7L 3N6 siol, Kingston, ON K7L 3N6, Canada
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 1, volume: 90, anno: 2001,
pagine: 321 - 328
SICI:
8750-7587(200101)90:1<321:EOHPOC>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEART-RATE-VARIABILITY; CARDIOVASCULAR CONTROL; SPECTRAL-ANALYSIS; CHRONIC EXERCISE; MID-PREGNANCY; GAS-EXCHANGE; RESPONSES; HEMODYNAMICS; BAROREFLEX; PLASMA;
Keywords:
spectral analysis; spontaneous baroreflex function; human gestation; exercise intensity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Wolfe, LA Queens Univ, Sch Phys & Hlth Educ, Kingston, ON K7L 3N6, Canada Queens Univ Kingston ON Canada K7L 3N6 ston, ON K7L 3N6, Canada
Citazione:
N.D. Avery et al., "Effects of human pregnancy on cardiac autonomic function above and below the ventilatory threshold", J APP PHYSL, 90(1), 2001, pp. 321-328

Abstract

This study examined the effects of human pregnancy on heart rate variability (HRV), spontaneous baroreflex (SBR) sensitivity, and plasma catecholamines at rest and during exercise. Subjects were 14 healthy, physically activepregnant women (PG; mean gestational age = 33.9 +/- 1.0 wk). Results were compared with an age-matched nonpregnant central group (NPG; n. = 14) with similar characteristics. The electrocardiographic R-wave-R-wave interval and systolic blood pressure (via finger plethysmograph) were measured on a beat-to-beat basis at rest and during upright cycling at 60 and 110% of the ventilatory threshold (T-vent). Parasympathetic nervous system (PNS) modulation (as reflected by HRV high-frequency/total power and SBR slope) was significantly reduced at rest in the PG vs. the NPG. During exercise, PNS modulation decreased significantly in both groups, but the magnitude of PNS withdrawal from rest to 110% T-vent was smaller in the PG vs. NPG. Sympathetic nervous system (SNS) modulation (reflected by the low-frequency power-to-high-frequency power ratio) increased above resting values at 60 and 110% T-vent in the NPG. SNS modulation at 110% T-vent was significantly lower in the PCT compared with the NPG. Plasma norepinephrine and epinephrine levels were also lower at 110% T-vent in the PG. It was concluded that healthy pregnant women exhibit lower PNS modulation at rest and blunted SNS modulation during exercise above T-vent in late gestation.

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Documento generato il 09/04/20 alle ore 07:35:37