title: Not so fast: intrinsic heart rate vs. beta-adrenergic responsiveness in the aging human heart.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Joyner
mesh_terms: D000375:Aging / Q000502:physiology*; D001341:Autonomic Nervous System / Q000254:growth & development / Q000502:physiology; D006321:Heart / Q000254:growth & development / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D011942:Receptors, Adrenergic, alpha / Q000502:physiology; D011943:Receptors, Adrenergic, beta / Q000502:physiology*; D014661:Vasoconstriction / Q000502:physiology
chemical_list: D011942:Receptors, Adrenergic, alpha; D011943:Receptors, Adrenergic, beta