title: Intensity of exercise and heart tissue of catecholamine content.
mesh_terms: D000818:Animals; D002395:Catecholamines / Q000378:metabolism*; D008297:Male; D009206:Myocardium / Q000032:analysis / Q000378:metabolism*; D009638:Norepinephrine / Q000032:analysis / Q000378:metabolism*; D009929:Organ Size; D005082:Physical Exertion; D051381:Rats
chemical_list: D002395:Catecholamines; D009638:Norepinephrine