Heart rate variability under resting conditions in postmenopausal and young women
Braz. j. med. biol. res
;
34(7): 871-877, July 2001. ilus, tab
Article
Dans Anglais
| LILACS
| ID: lil-298664
RESUMO
The aim of the present study was to compare the modulation of heart rate in a group of postmenopausal women to that of a group of young women under resting conditions on the basis of R-R interval variability. Ten healthy postmenopausal women (mean Ý SD, 58.3 Ý 6.8 years) and 10 healthy young women (mean Ý SD, 21.6 Ý 0.82 years) were submitted to a control resting electrocardiogram (ECG) in the supine and sitting positions over a period of 6 min. The ECG was obtained from a one-channel heart monitor at the CM5 lead and processed and stored using an analog to digital converter connected to a microcomputer. R-R intervals were calculated on a beat-to-beat basis from the ECG recording in real time using a signal-processing software. Heart rate variability (HRV) was expressed as standard deviation (RMSM) and mean square root (RMSSD). In the supine position, the postmenopausal group showed significantly lower (P<0.05) median values of RMSM (34.9) and RMSSD (22.32) than the young group (RMSM 62.11 and RMSSD 49.1). The same occurred in the sitting position (RMSM 33.0 and RMSSD 18.9 compared to RMSM 57.6 and RMSSD 42.8 for the young group). These results indicate a decrease in parasympathetic modulation in postmenopausal women compared to young women which was possibly due both to the influence of age and hormonal factors. Thus, time domain HRV proved to be a noninvasive and sensitive method for the identification of changes in autonomic modulation of the sinus node in postmenopausal women
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Système nerveux parasympathique
/
Repos
/
Rythme cardiaque
Type d'étude:
Étude pronostique
Limites du sujet:
Adulte
/
Femelle
/
Humains
langue:
Anglais
Texte intégral:
Braz. j. med. biol. res
Thème du journal:
Biologie
/
Médicament
Année:
2001
Type:
Article
Pays d'affiliation:
Brésil
Institution/Pays d'affiliation:
Universidade Federal de Säo Carlos/BR
/
Universidade de Säo Paulo/BR
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