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Crawford W. Adams, MD
Nashville, Tenn

JAMA. 1968;204(1):80-81.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

To the Editor:—

As stated in my original answer to Dr. Harris' question, a test of "exercise tolerance" implies a challenge to the coronary circulation. In all age groups there is considerable variability of exercise performance. The work load produced by the single or double Master's two-step test is frequently inadequate to demonstrate diagnostic electrocardiographic changes in a physically fit individual even though he may have underlying coronary artery disease. Despite Master's attachment to the wooden steps, the trend is toward the more reproduceable application of the work load either with the treadmill or bicycle ergometer.

Approximately 40% of patients in whom there is acute myocardial infarction or sudden death have no previous clinical evidence of underlying coronary artery disease.¹ Therefore, the coronary-prone individual must be detected before infarction occurs. A carefully monitored graded exercise test is easily performed and detects a high percentage of the coronary-prone individuals by . . . [Full Text PDF of this Article]

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