Effects of the adrenergic nervous system on training-induced cardiac enlargement, and on the intrinsic rate and phenylephrine sensitivity of isolated rat atria.


Atria isolated from rats after 6 to 7 weeks running training or swim training in water at 30 degrees C beat at a slower rate than did the atria from sedentary control animals. If the rats received noradrenaline injections with each running session their atrial rate was even lower, while propranolol injections did not lead to lower intrinsic atrial rate… (More)


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