EXERCISE TRAINING ASSOCIATED WITH DIETARY ADJUSTMENT INDUCES METABOLIC AND CARDIOVASCULAR BENEFITS IN HIGH‐FAT‐FED MENOPAUSE RATS

Abstract

IntroductionConsidering the increase in cardiometabolic risk after menopause, and that diet and exercise training (ET) are the pillars of prevention/treatment strategies, the objective of this study was to evaluate the metabolic, hemodynamic and autonomic effects of exercise training in an experimental model of menopausal undergoing a high‐fat diet followed by dietary adjustment. Twenty female C57BL/6J mice (8 weeks aged), all oophorectomized (bilateral ovarian removal) divided into 4 experimental groups (n = 5) were used: sedentary submitted to a high‐fat diet (OSD), sedentary submitted to 4 weeks of high‐fat diet and 4 weeks of control diet (OSRa), trained submitted to a high‐fat diet (OTD), trained submitted to 4 weeks of high‐fat diet and 4 weeks of control diet (OTRa). Oophorectomy was performed at the end of the 4th week of the protocol. Fasting glycemia and oral glucose tolerance were evaluated. ET had duration of 4 weeks (6th to 9th week of protocol, 5 days/week, 1 hour/day, intensity 50–70% of the maximum treadmill test). At the end of the protocol, the animals were cannulated for direct recording of arterial pressure (AP), after which baroreflex sensitivity and cardiovascular autonomic modulation were analyzed.RESULTSDietary adjustment promoted a reduction in glycemia and a better glucose tolerance, associated with reduction in cardiac sympathetic modulation (LF‐PI: OSD: 0.54±0.02; OSRa: 0.37±0.06; OTD: 3.0±0.02, OTRa: 0.19±0.02 ms2) and vascular (LF‐SAP: OSD: 11.3±1.7, OSRa: 3.6±0.9, OTD: 1.6±0.2; OTR:3.0±0.5mmHg2). ET, with or without dietary adjustment, increased physical capacity, reduced heart rate, improved baroreflex sensitivity, increased cardiac parasympathetic modulation (HF‐PI: OSD: 0.47±0.04, OSRa: 0,63±0.07, OTD: 0.86±0.02, OTRa: 0.75±0.07 ms2) and reduction of cardiac and vascular sympathetic modulation. However, only the association of ET with dietary adjustment was able to promote reduction in body weight, glycemia, improvement in glucose tolerance, reduction in blood pressure (mean AP: OSD: 123±2.1, OSRa: 114±0.8; OTD: 120±1.4; OTR: 110±4.0 mmHg), and further increase in parasympathetic modulation. Thus, the association of ET with dietary adjustment may be considered an important behavior for the management of cardiovascular risk in the association of obesity with ovarian deprivation.Support or Funding InformationCoordenação de Aperfeiçoamento de Pessoal de Nível Superior ‐ Brazil (CAPES) ‐ Funding Code: 001.This abstract is from the Experimental Biology 2019 Meeting. There is no full text article associated with this abstract published in The FASEB Journal.