Higher muscle mass associated with lower mortality risk in heart disease patientsApril 21, 2016
Researchers from the David Geffen School of Medicine at UCLA found that cardiovascular disease patients who have high muscle mass and low fat mass have a lower mortality risk than those with other body compositions. The findings also suggest that regardless of a person's level of fat mass, a higher level of muscle mass helps reduce the risk of death.
These findings indicate the importance of assessing body composition as a way to help predict cardiovascular and total mortality in people with cardiovascular disease.
In previous studies on the relationship between body composition and mortality, the researchers used a simpler clinical measure of body composition called the bio electrical impedance scale. They noted a possible protective effect of muscle mass on both mortality and metabolism in healthy people. The new study extends the findings from the earlier research using dual X-ray absorptiometry, a more rigorous method of measuring body composition.
The researchers examined data from the National Health and Nutrition Examination Survey, 1999 to 2004, of 6,451 participants who had prevalent cardiovascular disease. Each subject was categorized into one of four groups:
- low muscle/low fat mass
- low muscle/high fat mass
- high muscle/low fat mass
- high muscle/high fat mass
Because people with higher muscle mass were more likely to have a high body mass index, the findings could explain the "obesity paradox," which holds that people with a higher BMI have lower mortality levels.
The findings also highlight the importance of maintaining muscle mass, rather than focusing on weight loss, in order to prolong life, even in people who have a higher cardiovascular risk. The authors suggest that clinicians encourage their patients to participate in resistance exercises as a part of healthy lifestyle changes, rather than focusing primarily on, and monitoring, weight loss.
Dr. Preethi Srikanthan, associate clinical professor of medicine in the division of endocrinology at the David Geffen School of Medicine, is the study's primary investigator. The study's co-authors are Dr. Tamara Horwich, health sciences clinical professor of medicine, division of cardiology, and Dr. Chi-hong Tseng, adjunct associate professor of medicine in the division of general internal medicine and health services research.
The study was published in the American Journal of Cardiology.
University of California - Los Angeles Health Sciences
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