Circulation, Vol 64, 958-965, Copyright © 1981 by American Heart Association
TD Adams, FG Yanowitz, AG Fisher, JD Ridges, K Lovell and TA Pryor
The purpose of this study was to assess noninvasively the effects of
intense aerobic training on cardiac structure and function in a group of
healthy, college-age men (25 experimental and 11 control, mean age 22
years). Echocardiographic, electrocardiographic (ECG), and fitness
measurements were obtained before and after a 3-month endurance training
program and compared with similar measurements obtained in nonexercising
subjects. The supervised training program consisted of 50- minute jogging
sessions 5 days a week at 85% of maximal heart rate. Compared with the
control group, echocardiography after training showed an increase in left
ventricular (LV) end-diastolic dimension (p less than 0.05). LV
posterobasal wall thickness, septal wall thickness and ejection fraction
did not change significantly. ECG measurements revealed a decrease in
resting heart rate (p less than 0.05) and an increase in R-wave voltage in
leads V5 and V6 (p less than 0.01). The measured maximal oxygen consumption
increased by 16% (p less than 0.001). These data indicate that intense
aerobic training in college- age men results in a significant increase in
resting LV end-diastolic dimension and volume. The increase in maximal
stroke volume associated with exercise training may be partially explained
by these changes in cardiac dimensions.
ARTICLES
Noninvasive evaluation of exercise training in college-age men
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