Harvard Heart Letter

Exercise stress test

The treadmill test can reveal hidden problems in the heart.

One way to judge the health of the heart and the arteries that supply it with oxygen and nutrients is to make them work harder. That's the principle behind one of the most commonly used tests in cardiology, the exercise stress test (also known as the exercise tolerance test, treadmill test, or just the stress test). It's much the same thing a mechanic does when he or she races a car's engine.

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