Abstract
Age-related changes in physical function are closely associated with daily activity impairment among the elderly. Continuous maslinic acid intake may improve skeletal muscle mass; however, the concentration-dependent benefits of maslinic acid for physical functionality remain unclear. Therefore, we evaluated the bioavailability of maslinic acid and examined the effect of maslinic acid intake on skeletal muscle and quality of life in the healthy Japanese elderly. Five healthy adult men were administered test diets containing 30, 60, or 120 mg of maslinic acid. Analysis of plasma maslinic acid revealed concentration-dependent elevations in blood maslinic acid levels (p<0.01). Next, 69 healthy Japanese adult men and women were administered a placebo or 30 or 60 mg of maslinic acid continuously for 12 weeks with physical exercise in a randomized, double-blind, placebo-controlled trial. The trunk muscle mass (p<0.05) and vitality score according to the Short-Form-8 (p<0.05) were significantly higher in the 60 mg maslinic acid group than in the placebo group. Additionally, grip strength was significantly higher in the 30 (p<0.05) and 60 mg (p<0.05) groups than in the placebo group. Overall, maslinic acid intake with physical exercise improved muscle strength, muscle mass, and quality of life in a maslinic acid-intake-dependent manner.
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