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Estrogen can modulate menopausal women's heart rate variability

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b1_The aim of our study was to compare the responses of heart rate variability (HRV) with two di fferent types of hormonal substitution therapy (HT) in post-menopausal women (cross-sectional study) and to reveal an effect of HT shortly after beginning of its administration (f ollow-up study). To elucidate the influence of menopause and effects of different protocols of a HT on autonomic control of heart rate, we evaluated the heart rate variability (HRV) in 5 groups: premenopausal women (n=140), postmenopausal women without HT (n=360), women on HT with conjugated estrogen only (n =168), women on continuous combined estrogen-progesterone HT (n=117), and men (n=140). Frequency-domain of short-term stationary R-R intervals was performed to evaluate the total variance, low frequency power (LF; 0.04-0.15 Hz), high freque ncy power (HF; 0.15-0.40 Hz), portion of low frequency power (LF%) and ratio of LF to HF (LF/HF). Significantly lower portion of the LF was found in premenopausal women [46.9 (±2.7) nu] when compared to untreated postmenopausal wome n [54.3 (±2.9) nu] and men [55.2 (±3.0) nu]. Treatment by estrogen only was proved to decrease the LF% [40.1 (±2.1) nu] while no effect on HRV was observed in women treated with combination of estrogen and progesterone [57.2 (±3.1) nu]. Also the HF was lower in postmenopausal wome n [4.16 (±0.16) ms 2 ] than in premenopausal women [4.79 (±0.22) ms 2 ] and women treated with estrogen only [4.98 (±0.25) ms 2 ] while in women treated with combined hormonal therapy the average value [3.99 (±0.21) ms 2 ] did not significantly differ from that of untreated postmenopausal women. The follow-up study also proved increase of high frequency power already after two months of estrogen substitution therapy [4.86 (±0.14) ms 2 vs. 4.19 (±0.15) ms 2 ].
Library of the Czech Academy of Sciences
Title: Estrogen can modulate menopausal women's heart rate variability
Description:
b1_The aim of our study was to compare the responses of heart rate variability (HRV) with two di fferent types of hormonal substitution therapy (HT) in post-menopausal women (cross-sectional study) and to reveal an effect of HT shortly after beginning of its administration (f ollow-up study).
To elucidate the influence of menopause and effects of different protocols of a HT on autonomic control of heart rate, we evaluated the heart rate variability (HRV) in 5 groups: premenopausal women (n=140), postmenopausal women without HT (n=360), women on HT with conjugated estrogen only (n =168), women on continuous combined estrogen-progesterone HT (n=117), and men (n=140).
Frequency-domain of short-term stationary R-R intervals was performed to evaluate the total variance, low frequency power (LF; 0.
04-0.
15 Hz), high freque ncy power (HF; 0.
15-0.
40 Hz), portion of low frequency power (LF%) and ratio of LF to HF (LF/HF).
Significantly lower portion of the LF was found in premenopausal women [46.
9 (±2.
7) nu] when compared to untreated postmenopausal wome n [54.
3 (±2.
9) nu] and men [55.
2 (±3.
0) nu].
Treatment by estrogen only was proved to decrease the LF% [40.
1 (±2.
1) nu] while no effect on HRV was observed in women treated with combination of estrogen and progesterone [57.
2 (±3.
1) nu].
Also the HF was lower in postmenopausal wome n [4.
16 (±0.
16) ms 2 ] than in premenopausal women [4.
79 (±0.
22) ms 2 ] and women treated with estrogen only [4.
98 (±0.
25) ms 2 ] while in women treated with combined hormonal therapy the average value [3.
99 (±0.
21) ms 2 ] did not significantly differ from that of untreated postmenopausal women.
The follow-up study also proved increase of high frequency power already after two months of estrogen substitution therapy [4.
86 (±0.
14) ms 2 vs.
4.
19 (±0.
15) ms 2 ].

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