Serum 25(OH)D is an important hormone with a wide range of functions;its deficiency has been shown to impair muscle action and skeletal mineralization,and can lead to sarcopenia and the resulting decrease in muscle strength,particularly in the elderly to whom most of the published work refers to. Bischoff et al. reaffirmed the importance of exposure to sunlight on serum 25(OH)D levels, where institutionalized elderly demonstrated lower sunlight exposure and lower muscle strength compared to controls