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Effects of exhaustive exercise on contractile responses mediated by beta-adrenoceptor in rat cardiac myocytes / 中国应用生理学杂志
Chinese Journal of Applied Physiology ; (6): 437-440, 2013.
Artigo em Chinês | WPRIM | ID: wpr-235337
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the effects of exhaustive exercise on contraction mediated by beta-adrenoceptor (beta-AR) in rat cardiac myocytes and to analyze the mechanism by which cardiac systolic dysfunction is caused after exhaustive exercise.</p><p><b>METHODS</b>Sixteen SD rats were divided randomly into sedentary group and trained group. Cardiac myocytes were isolated from sedentary group and trained group after five times of exhaustive exercise in one week. Shortening response to norepinephrine (NE), time-to-peak contraction (TTP) and time-to-95% relaxation (R95) were measured after alpha1-AR were blocked. Also shortening responses to different levels of NE were observed.</p><p><b>RESULTS</b>Shortening amplitudes in trained rat cardiomyocytes were lower than that in sedentary group. Compared with sedentary group, shortening amplitudes induced by beta-AR stimulation were significantly decreased, meanwhile TTPs and R95 were prolonged when beta-AR were activated in trained rat cardiomyocytes. beta-AR responsiveness to NE was weakened in trained group compared with that in sedentary group.</p><p><b>CONCLUSION</b>Decreased shortening cardiomyocyte systolic function stimulating by beta-AR could result in cardiac systolic dysfunction after exhaustive exercise.</p>
Assuntos
Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Condicionamento Físico Animal / Fisiologia / Sangue / Ratos Sprague-Dawley / Receptores Adrenérgicos beta 1 / Miócitos Cardíacos / Contração Miocárdica Limite: Animais Idioma: Chinês Revista: Chinese Journal of Applied Physiology Ano de publicação: 2013 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Condicionamento Físico Animal / Fisiologia / Sangue / Ratos Sprague-Dawley / Receptores Adrenérgicos beta 1 / Miócitos Cardíacos / Contração Miocárdica Limite: Animais Idioma: Chinês Revista: Chinese Journal of Applied Physiology Ano de publicação: 2013 Tipo de documento: Artigo