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Older adults: Build muscle and you'll live longer
Date:3/14/2014

New UCLA research suggests that the more muscle mass older Americans have, the less likely they are to die prematurely. The findings add to the growing evidence that overall body composition and not the widely used body mass index, or BMI is a better predictor of all-cause mortality.

The study, published in the American Journal of Medicine, is the culmination of previous UCLA research led by Dr. Preethi Srikanthan, an assistant clinical professor in the endocrinology division at the David Geffen School of Medicine at UCLA, that found that building muscle mass is important in decreasing metabolic risk.

"As there is no gold-standard measure of body composition, several studies have addressed this question using different measurement techniques and have obtained different results," Srikanthan said. "So many studies on the mortality impact of obesity focus on BMI. Our study indicates that clinicians need to be focusing on ways to improve body composition, rather than on BMI alone, when counseling older adults on preventative health behaviors."

The researchers analyzed data collected by the National Health and Nutrition Examination Survey (NHANES) III, conducted between 1988 and 1994. They focused on a group of 3,659 individuals that included men who were 55 or older and women who were 65 or older at the time of the survey. The authors then determined how many of those individuals had died from natural causes based on a follow-up survey done in 2004.

The body composition of the study subjects was measured using bioelectrical impedance, which involves running an electrical current through the body. Muscle allows the current to pass more easily than fat does, due to muscle's water content. In this way, the researchers could determine a muscle mass index the amount of muscle relative to height similar to a body mass index. They looked at how this muscle mass index was related to the risk of death.

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Contact: Enrique Rivero
erivero@mednet.ucla.edu
310-794-2273
University of California - Los Angeles Health Sciences
Source:Eurekalert

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