Pengaruh Pajanan Sinar Ultraviolet B Bersumber dari Sinar Matahari terhadap Konsentrasi Vitamin D (25(OH)D) dan Hormon Paratiroit pada Perempuan Usia Lanjut Indonesia

Many studies showed that vitamin D deficiency and secondary hyper-parathyroidism cause serious impact on health including osteoporosis, osteomalacia, paralysis, fall, and osteoporotic fracture. This study was conducted to compare the effect of UVB from sunlight exposure in combination with calcium supplementation, and control (calcium only) on the vitamin D status and parathyroid hormone (PTH) concentration in Indonesian elderly women. This study was a randomized clinical trial in institutionalized care unit. Subjects included 74 elderly women with a mean age 71 years. Intervention was random allocation of UVB from sunlight exposure at 0.6 MED/hour noted in the UV meter on the face and both arms and calcium 1000 mg, three times per week for 6 weeks, and without treatment (calcium 1000 mg only). Main outcome measured were fasting serum levels of 25(OH) D, PTH, and calcium ion at 0 and 6 weeks in both treatment and control groups. The incidence of vitamin D deficiency in this population study was 35.1 %. In the treatment group, 25(OH) D increased from 59.1 nmol/L to 84.3 nmol/L (mean value after 6 weeks of sunlight exposure) with only a slight increase of 25(OH) D in the control group (51.8% vs 12.5%). 25(OH)D deficient levels in 15 out 16 subjects became normal after 6 weeks of sun exposure. There was no change of PTH levels in both groups. Additional results of this study are mean calcium intake of 248 mg/day and vitamin D intake of 28 IU/day.