Effect of Sunlight Exposure on Bone Mineral Density in Children with Severe Disability.
NEUROPEDIATRICS(2016)
Abstract
The aim of this study was to determine the efficacy of sunlight exposure for increasing bone mineral density (BMD) in children with severe disability. The subjects were five children with severe disability, aged 6 to 8 years. BMD was measured at baseline and after 3, 6, 9, and 12 months of starting sunlight exposure. All caregivers of patients were instructed to create opportunities to stay outdoors. Daily sunlight exposure time was defined as hours of staying outdoors. Mean hours of sunbathing per day were calculated at baseline and after 3, 6, 9, and 12 months of starting sunlight exposure. Sunlight exposure tended to be longer after starting than before starting in all patients, but the difference was not significant (p = 0.052). Along with the increase in sunlight exposure, BMD increased significantly after the start of sunlight exposure in all patients (p < 0.01). The serum values of total alkaline phosphatase and intact parathyroid hormone were significantly decreased and that of 25-hydroxyvitamin D was significantly increased 12 months after starting sunlight exposure. No patients had bone fractures after the start of sunlight exposure. These results suggest that sunlight exposure increased BMD, and that this may reduce the risk of bone fracture in children with disability.
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Key words
bone mineral density,BMD,osteoporosis,bone fracture,sunlight exposure,children with severe disability
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