PERSONAL HEALTH; The Treadmill’s Place in Evaluating Hearts

Each year hundreds of thousands of Americans, including some 700,000 Medicare recipients, get on a treadmill not for exercise but to try to determine if their hearts are healthy. Tim Russert, the NBC journalist, had such an exam, called an exercise or treadmill stress test, six weeks before he died of a heart attack last month at age 58. His results had been deemed normal, prompting people to question how worthwhile this test could be.

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