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Effects of high-intensity interval versus continuous moderateintensity aerobic exercise on apoptosis, oxidative stress and metabolism of the infarcted myocardium in a rat model

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The optimal aerobic exercise training (AET) protocol for patients following myocardial infarction (MI) has remained under debate. The present study therefore aimed to compare the effects of continuous moderateintensity training (CMT) and highintensity interval training (HIT) on cardiac functional recovery, and to investigate the potential associated mechanisms in a postMI rat model. Female Sprague Dawley rats (810 weeks old) undergoing MI or sham surgery were subsequently submitted to CMT or HIT, or kept sedentary for eight weeks. Prior to and following AET, echocardiographic parameters and exercise capacity of the rats were measured. Western blotting was used to evaluate the levels of apoptosis and associated signaling pathway protein expression. The concentrations of biomarkers of oxidative stress were also determined by ELISA assay. Messenger (m)RNA levels and activity of the key enzymes for glycolysis and fatty acid oxidation, as well as the rate of adenosine triphosphate (ATP) synthesis, were also measured. Compared with the MI group, exercise capacity and cardiac function were significantly improved following AET, particularly following HIT. Left ventricular ejection fraction and fraction shortening were further improved in the MIHIT group in comparison to that of the MICMT group. The two forms of AET almost equally attenuated apoptosis of the postinfarction myocardium. CMT and HIT also alleviated oxidative stress by decreasing the concentration of malondialdehyde and increasing the concentration of superoxide dismutase and glutathione peroxidase (GPx). In particular, HIT induced a greater increase in the concentration of GPx than that of CMT. AET, and HIT in particular, significantly increased the levels of mRNA and the maximal activity of phosphofructokinase1 and carnitine palmitoyl transferase1, as well as the maximal ratio of ATP synthesis. In addition, compared with the MI group, the expression of signaling proteins PI3K, Akt, p38mapk and AMPK was significantly altered in the MICMT and MIHIT groups. HIT was superior to CMT in its ability to improve cardiac function and exercise capability in a postMI rat model. HIT was also superior to CMT with regard to attenuating oxidative stress and improving glucolipid metabolism of the postMI myocardium.
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Document Type: Research Article

Affiliations: 1: Heart Center, Peking University People's Hospital, Beijing 100044, P.R. China 2: Department of Cardiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China

Publication date: August 1, 2015

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  • Molecular Medicine Reports is a monthly, peer-reviewed journal available in print and online, that includes studies devoted to molecular medicine, underscoring aspects including pharmacology, pathology, genetics, neurosciences, infectious diseases, molecular cardiology and molecular surgery. In vitro and in vivo studies of experimental model systems pertaining to the mechanisms of a variety of diseases offer researchers the necessary tools and knowledge with which to aid the diagnosis and treatment of human diseases.
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