Document Type : Research Paper I Open Access I Released under CC BY-NC 4.0 license

Authors

1 Ph.D of Exercise Physiology department, Faculty of Sport Sciences, Mazandaran University, Babolsar, Iran

2 Assistant professor of anatomical sciences, Basic medical science research center, Histogenotechcompany, Tehran, Iran

3 . Professor of Exercise Physiology department, Faculty of Sport Sciences, Mazandaran University, Babolsar, Iran

Abstract

Reducing the effects of anthracyclines-induced cardiac toxicity is an effective strategy for more survival of cancer patients. This study aimed at investigating the pre-treatment effect of voluntary physical activity on cardiac damage due to the induction of cumulative doses of doxorubicin in aging model rats. 24 male Wistar rats (12 weeks old) were randomly divided into 3 groups: saline (S), doxorubicin (D), and voluntary physical activity (DWR). Ageing was induced by daily injection of D-galactose (100 mg/kg) for 9 weeks. 6 weeks of voluntary physical activity was performed on a wheel running. In the last 15 days of physical activity and D-galactose injection, doxorubicin with a cumulative dose of 15 mg/kg (or 1 mg/day) was injected. 48 hours after the end of physical activity and doxorubicin injection, the animals were euthanized and their left ventricles were severed for histological evaluation. The results showed that injection of doxorubicin insignificantly increased the apoptotic index and the ratio of heart weight to body weight while significantly decreased the ratio of fiber to the interstitial space (P<0.05). In addition, qualitative studies of the heart tissue revealed vacuolation, cell nucleus fragmentation, tissue structure cluttering, and cardiac fibers destruction. In contrast, voluntary physical activity before and during doxorubicin injection reduced these changes. Voluntary physical activity in combination with doxorubicin is an effective strategy to reduce doxorubicin-induced heart damage.
 

Keywords

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