The proliferative activity of myocardial capillary wall cells in variously aged swimming-exercised rats.
Cellular proliferation was studied by incorporation of 3H-thymidine in the hearts of young, adult and old swimming-exercised rats. The proliferative activity was measured by scintillation counting. The swimming exercise induced a significant proliferation of capillary wall cells in the younger age groups, suggesting a neoformation of myocardial capillaries in these rats, whereas no cell proliferation was recorded in the old rats.
D000367:Age Factors; D000818:Animals; D001835:Body Weight; D002196:Capillaries / Q000166:cytology*; D006332:Cardiomegaly / Q000473:pathology; D002455:Cell Division; D003331:Coronary Vessels / Q000166:cytology*; D008297:Male; D009929:Organ Size; D005082:Physical Exertion; D051381:Rats; D013550:Swimming