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Cardiovascular adaptive responses in rats submitted to moderate resistance training

Authors
  • Pinter, Rita de Cassia Cypriano Ervati
  • Padilha, Alessandra Simao
  • Oliveira, Edilamar Menezes de
  • Vassallo, Dalton Valentim
  • Lizardo, Juliana Hott de Fucio
Publication Date
Jan 01, 2008
Source
Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (BDPI/USP)
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Abstract

The present study investigated the effects of 8 week of resistance training (RT) on hemodynamic and ventricular function on cardiac myosin ATPase activity, and on contractility of papillary muscles of rats. Groups: control (CO), electrically stimulated (ES), trained at 60% (TR 60%) and 75% of one repetition maximum (1RM) (TR 75%). Exercise protocol: 5 sets of 12 repetitions at 60 and 75% of 1RM, 5 times per week. The CO and ES groups had similar values for parameters analyzed (P > 0.05). Blood pressure (BP), heart rate (13%), left ventricle systolic pressure (LVSP 13%) decreased and cardiac myosin ATPase activity increased in the TR 75% group (90%, P < 0.05). The contractile performance of papillary muscles increased in trained rats (P < 0.05). Eight weeks of RT was associated with lowering of resting BP, heart rate and LVSP, improvements in contractility of the papillary muscle and an increase of cardiac myosin ATPase activity in rats.

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