...Exercise, the thinking goes, and you might be able to rewrite the future for your muscles.
Consider the results of a stirring study published last month in the journal The Physician and Sportsmedicine. For it, researchers at the University of Pittsburgh recruited 40 competitive runners, cyclists and swimmers. They ranged in age from 40 to 81, with five men and five women representing each of four age groups: 40 to 49, 50 to 59, 60 to 69, and 70-plus. All were enviably fit, training four or five times a week and competing frequently. Several had won their age groups in recent races.
They completed questionnaires detailing their health and weekly physical activities. Then the researchers measured their muscle mass, leg strength and body composition, determining how much of their body and, more specifically, their muscle tissue was composed of fat. Other studies have found that as people age, they not only lose muscle, but the tissue that remains can become infiltrated with fat, degrading its quality and reducing its strength...MORE
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