Flexing Their Muscles Helps Kidney Disease Patients Live Longer, Study Finds

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Kidney disease patients are healthier and live longer if they've beefed up their muscles, according to a study appearing in an upcoming issue of the Clinical Journal of the American Society Nephrology (CJASN). The results suggest that patients may benefit from pumping iron or taking medications to boost their lean body mass.

Kidney disease patients who are on dialysis live longer if they have a high body mass index (BMI); however, BMI measurements do not differentiate lean from fat mass. Kamyar Kalantar-Zadeh MD, PhD (Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center) and his colleagues examined the effects of lean and fat mass on 792 dialysis patients' health and survival by measuring patients' mid-arm muscle circumference (a measure of lean mass) and triceps skinfold (a measure of fat mass) over a 5-year period.

The researchers found that patients with a high mid-arm muscle circumference scored better on a mental health test and lived longer than patients with a low mid-arm muscle circumference. Patients with the highest mid-arm muscle circumference were 37 percent less likely to die during the study period than patients with the lowest circumference. Triceps skinfold measurements were not as predictive of patients' health and survival.

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