title: QT interval and QT dispersion in endurance athletes and in power athletes using large doses of anabolic steroids.
abstract: We measured electrocardiographic repolarization indexes in athletes. Physiologic adaptive cardiac hypertrophy did not increase QT dispersion in endurance athletes despite long QT intervals due to increased vagal tone. In contrast, power athletes taking large doses of anabolic steroids had increased QT dispersion despite short QT intervals, which seems to reflect altered myocardium in the hypertrophied heart.
authors.affiliation: Unit for Sports and Exercise Medicine, Institute of Biomedicine, University of Helsinki, Finland.
authors.forename: A
authors.initials: A
authors.lastname: Stolt
authors.forename: T
authors.initials: T
authors.lastname: Karila
authors.forename: M
authors.initials: M
authors.lastname: Viitasalo
authors.forename: M
authors.initials: M
authors.lastname: Mäntysaari
authors.forename: U M
authors.initials: UM
authors.lastname: Kujala
authors.forename: J
authors.initials: J
authors.lastname: Karjalainen
mesh_terms: D000305:Adrenal Cortex Hormones / Q000008:administration & dosage / Q000494:pharmacology*; D016022:Case-Control Studies; D005387:Finland; D006329:Heart Conduction System / Q000187:drug effects*; D006801:Humans; D017379:Hypertrophy, Left Ventricular / Q000150:complications / Q000503:physiopathology*; D008297:Male; D012420:Running; D013177:Sports; D013997:Time Factors
chemical_list: D000305:Adrenal Cortex Hormones