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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Aerobic physical training has little effect on cardiovascular autonomic control in aging rats subjected to early menopause

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Author(s):
Tezini, Geisa C. S. V. [1] ; Dias, Daniel P. M. [2] ; Souza, Hugo C. D. [1]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, Sch Med Ribeirao Preto, Dept Biomech Med & Rehabil, Exercise Physiol Lab, BR-14049900 Ribeirao Preto, SP - Brazil
[2] Univ Sao Paulo, Sch Med Ribeirao Preto, Dept Physiol, BR-14049900 Ribeirao Preto, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Experimental Gerontology; v. 48, n. 2, p. 147-153, FEB 2013.
Web of Science Citations: 19
Abstract

We investigated and compared the effects of physiological menopause (PM) and early menopause (EM) and the adaptations promoted by physical training on the cardiovascular autonomic control of aged rats. Female Wistar rats (N = 72) were assigned to 3 groups: control (22 weeks old rats, undergoing sham surgery in the 10th week of life), PM (82 weeks old rats, undergoing sham surgery in the 10th week of life) and EM (82 weeks old rats, undergoing ovariectomy in the 10th week of life). In each group, half of the rats were subjected to swimming training over a period of 10 weeks. Sedentary PM and EM groups had higher basal mean arterial pressure (MAP) and heart rate (HR) and lower intrinsic HR compared to the sedentary control group. Physical training reduced MAP in PM group. All trained groups had lower basal HR; however, only control and PM-trained groups showed decreased intrinsic HR. The assessment of cardiac autonomic balance showed that PM and EM sedentary groups exhibited sympathetic predominance compared to control group. After physical training, only EM group presented sympathetic predominance. HR variability (pulse interval) was similar among all sedentary groups. However, control and PM-trained groups showed lower power in low frequency band (LF; 0.2-0.75 Hz) and higher power in high frequency band (HF; 0.75-3.0 Hz). The analysis of systolic arterial pressure variability revealed that PM and EM sedentary groups had higher LF power. However, PM group showed lower LF power following physical training. Finally, PM and EM groups had a reduction in spontaneous baroreflex sensitivity, that was attenuated by physical training. The overall results suggest that PM or EM promotes similar negative effects on MAP, HR and cardiovascular autonomic control. However, unlike the PM group, physical training was not able to mitigate all negative effects of EM on cardiovascular autonomic control. (c) 2012 Elsevier Inc. All rights reserved. (AU)

FAPESP's process: 08/10929-9 - Experimental study comparing the effects of early and physiological estrogen deficiency on cardiovascular control - the role of hormone replacement and aerobic physical training
Grantee:Hugo Celso Dutra de Souza
Support Opportunities: Regular Research Grants