title: [Changes in electrical systole and heart rate in healthy persons after the exercise test].
abstract: Relationships between the electrical systole and the cardiac cycle were evaluated at rest and after exercise in 1083 normal male subjects, aged 18 to 25 years. In a resting condition, most formulas determining proper QT duration were shown to be within the confidence regression limit: QT = 0.138 RR + 0.246 +/- 0.04 s, while the relationship was linear. Rapid heart rate change produced a discrepancy between changes in the duration of electric systole and the changing cardiac cycle, resulting in a continuous variation of the pattern of QT-RR relationship, for which reason its description by the available linear formulas was no longer possible. A systems analysis established major characteristics of the transitional process, such as the maximum readjustment time (18.3 +/- 0.5 s), the stabilization time (67.9 +/- 8.4 s) and the number of readjustments (not more than two).
authors: V M
authors: VM
authors: Iurlov
authors: B R
authors: BR
authors: Bogomol'nyĭ
mesh_terms: D000293:Adolescent; D000328:Adult; D005080:Exercise Test; D006329:Heart Conduction System / Q000502:physiology*; D006339:Heart Rate; D006801:Humans; D008297:Male; D009200:Myocardial Contraction; D012146:Rest; D013599:Systole
vernacular_title: Izmeneniia élektricheskoĭ sistoly i ritma serdtsa u zdorovykh lits posle proby s fizicheskoĭ nagruzkoĭ.