Sarcopenia explained

Why muscles wither with age is captivating a growing number of scientists [and] drug and food companies...

With interest high among the aging, the market potential for maintaining and rebuilding muscle mass seems boundless. Drug companies already are trying to develop drugs that can build muscles or forestall their weakening without the notoriety of anabolic steroids. Food giants like Nestlé and Danone are exploring nutritional products with the same objective.

In addition, geriatric specialists, in particular, are now trying to establish the age-related loss of muscles as a medical condition under the name sarcopenia, from the Greek for loss of flesh. Simply put, sarcopenia is to muscle what osteoporosis is to bone...

Researchers involved in the effort say doctors and patients need to be more aware that muscle deterioration is a major reason the elderly lose mobility and cannot live independently...

A task force of academic and industry scientists met in Rome last November and in Albuquerque last month and has submitted a proposed definition of sarcopenia for publication in a medical journal. The meeting received financial support from several drug companies and food companies...

Causes of the loss of muscle mass or strength might include hormonal changes, sedentary lifestyles, oxidative damage, infiltration of fat into muscles, inflammation and resistance to insulin. Some problems stem from the brain and nervous system, which activate the muscles.

Experts say the best approach to restoring or maintaining muscle mass and strength is exercise, particularly resistance training...

“There’s a lot more to the story than simply having a lot of muscle tissue,” said Brian C. Clark, an expert at Ohio University. “Most of the drug stuff has been targeting muscle mass.”

So the definition is shifting to include muscle strength and function. The academic-industry task force recommends testing whether a person can walk four meters, or about 13 feet, in four seconds...

Demonstrating such benefits and cost savings would help counter criticism that doctors and drug companies are trying to turn a natural consequence of aging into a disease.

More at the New York Times link.