Cardiology: Exercise at Any Age

Such long-lived exercisers as Cardiologist Paul Dudley White have long since convinced doctors and laymen that lifelong exercise is good for the heart. But what of the man who slacks off in midlife? Is it safe for him to crank up again? Apparently it is, judging from a study conducted at the University of Illinois by Dr. John O. Holloszy of the U.S. Public Health Service.

Of the 15 men, aged 35 to 55, in Dr. Holloszy's study, one had had a heart attack and another severe high blood pressure. The rest were in...

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