189 research outputs found
Autonomic modulation of heart rate of young and postmenopausal women undergoing estrogen therapy
Autonomic modulation of heart rate of young and postmenopausal women undergoing estrogen therapy
The aim of the present study was to determine whether estrogen therapy (ET) reduces alterations of the autonomic control of heart rate (HR) due to hypoestrogenism and aging. Thirteen young (24 ± 2.6 years), 10 postmenopausal (53 ± 4.6 years) undergoing ET (PM-ET), and 14 postmenopausal (56 ± 2.6 years) women not undergoing ET (PM) were studied. ET consisted of 0.625 mg/day conjugated equine estrogen. HR was recorded continuously for 8 min at rest in the supine and sitting positions. HR variability (HRV) was analyzed by time (SDNN and rMSSD indices) and frequency domain methods. Power spectral components are reported as normalized units (nu) at low (LF) and high (HF) frequencies, and as LF/HF ratio. Intergroup comparisons: SDNN index was higher in young (median: supine, 47 ms; sitting, 42 ms) than in PM-ET (33; 29 ms) and PM (31; 29 ms) women (P < 0.05). PM showed lower HFnu, higher LFnu and higher LF/HF ratio (supine: 44, 56, 1.29; sitting: 38, 62, 1.60) than the young group in the supine position (61, 39, 0.63) and the PM-ET group in the sitting position (57, 43, 0.75; P < 0.05). Intragroup comparisons: HR was lower in the supine than in the sitting position for all groups (P < 0.05). The HRV decrease from the supine to the sitting position was significant only in the young group. These results suggest that HRV decreases during aging. ET seems to attenuate this process, promoting a reduction in sympathetic activity on the heart and contributing to the cardioprotective effect of estrogen hormones.49149
Comparison of anaerobic threshold determined by visual and mathematical methods in healthy women
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Reproductive parameters of Sindhi cows (Bos taurus indicus) treated with two ovulation synchronization protocols
Adapted Bailenger method improves the rate of Ascaris suum eggs recovery from liquid pig manure compost
FRUIT FLIES AND THEIR PARASITOIDS IN THE FRUIT GROWING REGION OF LIVRAMENTO DE NOSSA SENHORA, BAHIA, WITH RECORDS OF UNPRECEDENTED INTERACTIONS
Glutamine dipeptide supplementation improves clinical responses in patients with diabetic foot syndrome
Estradiol and testosterone concentrations in follicular fluid as criteria to discriminate between mature and immature oocytes
EficĂĄcia in vitro de desinfetantes utilizados na anti-sepsia dos tetos frente a leveduras isoladas do leite de vaca com mastite
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