Chronic exercise does not alter the chronotropic response of isolated rat atria to catecholamines.
Atria isolated from rats after 7 weeks of exercise training beat at a slower rate than did atria from sedentary controls. There is no significant difference between the chronotropic responses of the 2 groups to epinephrine or norepinephrine.
D000818:Animals; D016275:Atrial Function; D004837:Epinephrine / Q000494:pharmacology*; D006339:Heart Rate / Q000187:drug effects*; D008297:Male; D009638:Norepinephrine / Q000494:pharmacology*; D010805:Physical Conditioning, Animal; D051381:Rats; D011919:Rats, Inbred Strains; D013268:Stimulation, Chemical
D009638:Norepinephrine; D004837:Epinephrine