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Original Article
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Volume 346:793-801 March 14, 2002 Number 11
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Exercise Capacity and Mortality among Men Referred for Exercise Testing
Jonathan Myers, Ph.D., Manish Prakash, M.D., Victor Froelicher, M.D., Dat Do, M.D., Sara Partington, B.Sc., and J. Edwin Atwood, M.D.

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ABSTRACT

Background Exercise capacity is known to be an important prognostic factor in patients with cardiovascular disease, but it is uncertain whether it predicts mortality equally well among healthy persons. There is also uncertainty regarding the predictive power of exercise capacity relative to other clinical and exercise-test variables.

Methods We studied a total of 6213 consecutive men referred for treadmill exercise testing for clinical reasons during a mean (±SD) of 6.2±3.7 years of follow-up. Subjects were classified into two groups: 3679 had an abnormal exercise-test result or a history of cardiovascular disease, or both, and 2534 had a normal exercise-test result and no history of cardiovascular disease. Overall mortality was the end point.

Results There were a total of 1256 deaths during the follow-up period, resulting in an average annual mortality of 2.6 percent. Men who died were older than those who survived and had a lower maximal heart rate, lower maximal systolic and diastolic blood pressure, and lower exercise capacity. After adjustment for age, the peak exercise capacity measured in metabolic equivalents (MET) was the strongest predictor of the risk of death among both normal subjects and those with cardiovascular disease. Absolute peak exercise capacity was a stronger predictor of the risk of death than the percentage of the age-predicted value achieved, and there was no interaction between the use or nonuse of beta-blockade and the predictive power of exercise capacity. Each 1-MET increase in exercise capacity conferred a 12 percent improvement in survival.

Conclusions Exercise capacity is a more powerful predictor of mortality among men than other established risk factors for cardiovascular disease.


Source Information

From the Division of Cardiovascular Medicine, Stanford University Medical Center and the Veterans Affairs Palo Alto Health Care System — both in Palo Alto, Calif.

Address reprint requests to Dr. Myers at the Cardiology Division (111C), Veterans Affairs Palo Alto Health Care System, 3081 Miranda Ave., Palo Alto, CA 94304, or at drj993{at}aol.com.

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Related Letters:

Exercise Capacity and Mortality
Palatini P., Ko D. T., Hebert P. R., Krumholz H. M., Perlo D. H., Myers J., Froelicher V., Balady G. J.
Extract | Full Text | PDF  
N Engl J Med 2002; 347:288-290, Jul 25, 2002. Correspondence

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