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• W1985664585 abstract "The risks associated with hormone replacement therapy, especially cardiac diseases in postmenopausal women, have prompted extensive studies for other preventive or therapeutic alternatives. We investigated the cardioprotective effects of exercise training on the changes in cardiac myofilament Ca2+ activation in 10-wk-old ovariectomized rats. The exercise groups were subjected to a 9-wk running program on a motor-driven treadmill 1 wk after surgery. The relationship between pCa (-log molar free Ca2+ concentration) and myofibrillar MgATPase activity of exercise-sham myofibrils or exercise-ovariectomized myofibrils was the same and could not be distinguished from that of sedentary-sham control hearts. In contrast, a significant suppression in maximum MgATPase activity and a leftward shift of pCa50 (half-maximally activating pCa) in the pCa-ATPase activity relationship were detected in sedentary-ovariectomized rats. Exercise training also prevented the shift in myosin heavy chain (MHC) isoforms toward beta-MHC in ovariectomized hearts. The upregulation of beta1-adrenergic receptors in the left ventricular membranes of ovariectomized rat hearts, as measured by receptor binding and immunoblot analyses, was no longer observed in exercise-ovariectomized hearts. Immunoblot analyses of heat shock protein (HSP) 72, an inducible form of HSP70, demonstrated a significant downregulation in ovariectomized hearts. Exercise training in ovariectomized rats completely reversed the expression of HSP72 to the same level as sham controls. Our results clearly indicate the cardioprotective effects of exercise training on changes in cardiac myofilament Ca2+ activation in ovariectomized rats. Alterations in expression of beta1-adrenergic receptors and HSP72 may, in part, play a mechanistic role in the cardioprotective effects." @default.
• W1985664585 created "2016-06-24" @default.
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• W1985664585 date "2004-05-01" @default.
• W1985664585 modified "2023-09-27" @default.
• W1985664585 title "Cardioprotective effects of exercise training on myofilament calcium activation in ovariectomized rats" @default.
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• W1985664585 doi "https://doi.org/10.1152/japplphysiol.01227.2003" @default.
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