Relationship between age, chronic exercise, and connective tissue of the heart.
D000375:Aging; D000818:Animals; D001835:Body Weight; D003094:Collagen / Q000032:analysis; D003238:Connective Tissue / Q000032:analysis*; D003239:Connective Tissue Cells; D006321:Heart / Q000033:anatomy & histology; D006339:Heart Rate; D006352:Heart Ventricles / Q000032:analysis; D006909:Hydroxyproline / Q000032:analysis; D008297:Male; D009206:Myocardium / Q000032:analysis* / Q000166:cytology; D009929:Organ Size; D005082:Physical Exertion; D051381:Rats
D003094:Collagen; D006909:Hydroxyproline