Prevalence and Reproducibility of ECG-documented Premature Contractions (PCs) with Exercise in Young Adults
Date
1982-05Author
Hinshelwood, Robert A.
Department
Physical Education
Advisor(s)
Wilson, Phil
Metadata
Show full item recordAbstract
Evaluation of exercise arrhythmias requires knowledge of distribution of such arrhythmias in a specific population. I have characterized
a college-aged (R = 19 y r ) population i n terms of the prevalence and reproducibility of exercise PCs. Initially , 106 males (MI and 109
female^ (F), all Caucasian, non-smoking and clinically healthy, underwent standardized Bruce treadmill tests (Tl) with continuous recording
of ECG lead V5 throughout exercise and 5 min. of recovery. Thirty-one (29%) M and 21 (19%) F demonstrated PCs. These were primarily of low
frequency (<6), fairly evenly distributed in terms of a trial or ventricular origin, and found throughout exercise and recovery. No heart rate
threshold 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 PCs
on 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. Reproducibility
was 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</=.05) than F who did reproduce. The results
show that at least occasional PCs are fairly common during exercise in clinically healthy young adults, with prevalence (p</=.10) and reproducibility (p</=.05) being higher in males than females. Reproducibility diminishes as one looks at specific frequencies of PCs. Individuals
with six or more premature contractions during exercise are much more likely to demonstrate premature contractions during a subsequent exercise bout.
Subject
Exercise --Physiological aspects
Permanent Link
http://digital.library.wisc.edu/1793/53050Type
Thesis