Cardiovascular adaptive responses in rats submitted to moderate resistance training.
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.
de Cássia Cypriano Ervati Pinter
Rita
R
Department of Physiological Sciences, Federal University of Espírito Santo, Ave. Marechal Campos, Vitoria, Espirito Santo, Brazil.
Padilha
Alessandra Simão
AS
de Oliveira
Edilamar Menezes
EM
Vassallo
Dalton Valentim
DV
de Fúcio Lizardo
Juliana Hott
JH
D000818:Animals; D001794:Blood Pressure / Q000502:physiology; D001835:Body Weight / Q000502:physiology; D002320:Cardiovascular Physiological Phenomena; D004558:Electric Stimulation; D004594:Electrophysiology; D006339:Heart Rate / Q000502:physiology; D008297:Male; D009119:Muscle Contraction / Q000502:physiology; D009200:Myocardial Contraction / Q000502:physiology; D009206:Myocardium / Q000201:enzymology; D009218:Myosins / Q000378:metabolism; D010210:Papillary Muscles / Q000502:physiology; D010805:Physical Conditioning, Animal / Q000502:physiology*; D051381:Rats; D017208:Rats, Wistar; D016277:Ventricular Function, Left / Q000502:physiology
D009218:Myosins