Prevalence and Reproducibility of ECG-documented Premature Contractions (PCs) with Exercise in Young Adults

[摘要] Evaluation of exercise arrhythmias requires knowledge of distribution of such arrhythmias in a specific population. I have characterizeda college-aged (R = 19 y r ) population i n terms of the prevalence and reproducibility of exercise PCs. Initially , 106 males (MI and 109female^ (F), all Caucasian, non-smoking and clinically healthy, underwent standardized Bruce treadmill tests (Tl) with continuous recordingof ECG lead V5 throughout exercise and 5 min. of recovery. Thirty-one (29%) M and 21 (19%) F demonstrated PCs. These were primarily of lowfrequency (<6), fairly evenly distributed in terms of a trial or ventricular origin, and found throughout exercise and recovery. No heart ratethreshold for PCs was evident. Males with PCs exercised longer (14:55 vs 13:55, ps.01 ) than M without PCs. Of the 52 subjects (Ss) with PCson Tl, 25 M and 19 F were retested (T2) within 6-119 days (E = 39 days). Eighteen (72%) M and 7 (37%) F showed PCs also on T2. Reproducibilitywas generally not precise i n terms of frequency of PCs, but PCs were generally of the same origin and often occurred at similar exercise intensities on both tests . Females who did not reproduce PCs exercised longer (11:05 vs 10:05, p

[发布机构] University of Wisconsin

[关键词] Exercise --Physiological aspects