The EKG stress test, also called the treadmill test, uses an EKG to record the heart's electrical activity. In the past, doctors performed stress tests as a part of routine check-ups for middle-aged and older patients, especially men. Doctors now use these tests to help diagnose heart disease -- the test can detect blood flow abnormalities and other problems. A doctor may recommend this test if a patient is experiencing chest pain or shortness of breath, but he or she must be able to exercise to take the test.

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