Evaluating two new indicators of cardiac reserve.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002318:Cardiovascular Diseases / Q000175:diagnosis*; D005080:Exercise Test / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010701:Phonocardiography / Q000379:methods*; D012372:ROC Curve; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity