| Summary: | 碩士 === 中臺科技大學 === 醫學影像暨放射科學系暨研究所 === 106 === Problem of aging population in Taiwan was getting serious. Along with the growth of the ages and degradation of structure and function of human body, more and more people discussed issues regarding middle-aged and older adults and also paid attention to health increasingly.
This research not only observed variation on ages of body composition and lower limb muscle strength, and difference between men and women by Dual-energy X-ray Absorptiometry（DEXA）, but also looked into the correlation between lower limb muscle mass and muscle strength.
It offered the relative information to middle-aged and older adults, to let them supply enough body composition for lower limb and improve the muscle strength to prevent falls or reduce the risks of falls, in order to maintain the health and life quality.
This research used Excel to analyze data collected from selected 72 subjects of age over 50 years old that measured body composition by DEXA and measured lower limb muscle strength of legs by the isokinetic measurement, and then to explore and discuss changes of body composition, muscle strength and age. It also observed the difference of body composition and lower limb muscle strength between men and women by Independent sampling t-test. After that, it analyzed and investigated the correlation between lower limb muscle mass and muscle strength by Pearson correlation.
The outcome showed muscle mass declined and fat mass increased with age, moreover, the body composition and muscle power between men and women were different: men had more muscle mass, and women had more fat mass. Men’s lower limb muscle strength was greater than women’s (p < 0.001). In the result of correlation analysis, it showed a high-positive correlation between lower limb muscle mass and muscle strength (Left leg: r = 0.65，p < 0.01; Right leg: r = 0.71，p < 0.01).
In the past, many people recognized that DEXA can simply use for measuring bone density, but with the advance of science and technology, now DEXA not only can measure body composition of full body and part body, but also with low radiation dose, high efficiency and high accuracy. In the result of this research, there is a strong correlation between lower limb muscle mass and muscle strength. Therefore, DEXA is another option for middle-aged and older adults to evaluate lower limb muscle strength.
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