{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T16:55:05Z","timestamp":1788886505139,"version":"build-2803163510"},"reference-count":41,"publisher":"Korean Society of Obstetrics and Gynecology","issue":"4","license":[{"start":{"date-parts":[[2025,6,19]],"date-time":"2025-06-19T00:00:00Z","timestamp":1750291200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["ogscience.org"],"crossmark-restriction":true},"short-container-title":["Obstet Gynecol Sci"],"published-print":{"date-parts":[[2025,7,15]]},"abstract":"<jats:p>ObjectiveThis study aimed to evaluate the effects of narrowband ultraviolet B (UVB) irradiation on bone and muscle health in postmenopausal women.MethodsA randomized controlled trial was conducted involving 70 postmenopausal women with vitamin D deficiency (&lt;20 ng\/mL) and osteopenia. Participants were randomly assigned to two groups. For 6 months, 35 postmenopausal women in study group A received three weekly sessions of narrowband UVB therapy and vitamin D supplements in the form of 100,000 international unit (IU) cholecalciferol weekly as loading therapy for 8 weeks. This was followed by the daily administration of cholecalciferol 3,000 IU as maintenance therapy for 16 weeks. The control group B consisted of 35 postmenopausal women who were administered vitamin D supplements alone for 6 months. Enzyme-linked immuno sorbent assay kits were used to test the serum levels of 25-hydroxyvitamin D (25(OH)D), dual-energy X-ray absorptiometry (DEXA) (DMS, Occitanie, France) was used to test the bone mineral density of the lumbar spine and right femur, and a Biodex System 3 (Biodex Medical Systems Inc., Shirley, NY, USA) isokinetic dynamometer was used to assess the peak torque of the extensors and flexors of the dominant knee.ResultsSerum 25(OH)D levels (P=0.000), Lumbar T-score (P=0.008), femoral T-score (P=0.002), and knee extensor peak torque (P=0.030) significantly increased in both groups after 6 months of treatment, favoring study group A over the control group B.ConclusionNarrowband UVB combined with vitamin D3 supplementation is more effective than vitamin D supplementation 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