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• W2137342019 abstract "Objectives: to evaluate the effects of vitamin D supplementation on parathyroid function and bone turnover in aged, chronically immobile patients. Design: a randomised double-blind controlled trial. Subjects: two hundred and eighteen long-term inpatients aged over 65 years. Intervention: the patients were randomised into treatment groups of I-III, each receiving 0 IU, 400 IU and 1200 IU cholecalciferol per day, respectively. In case of inadequate consumption of dairy products, patients received a daily calcium substitution of 500 mg. Measurements: plasma concentrations of 25-hydroxyvitamin D (25-OHD), intact parathyroid hormone (PTH), amino-terminal propeptide of type I procollagen (PINP), a marker of bone formation, and carboxy-terminal telopeptide of type I collagen (ICTP), a marker of bone resorption, were measured at baseline and after 6 months. Results: the patients (age 84.5 years) were chronically bedridden. The baseline 25-OHD was low (23 nmol/l), correlated inversely with PINP, and tended to associate inversely with PTH. The prevalence of vitamin D deficiency (VDD) (25-OHD < 50 nmol/l) was 98% and PTH was elevated in 23% of the patients. Vitamin D supplementation significantly increased 25-OHD concentrations (124% group II, 204% group III) and decreased PTH (−7% group II, −8% group III). PINP tended to decrease, but ICTP tended to increase, and only their ratio decreased significantly. The tendency of ICTP to increase was inconsistent. Changes in 25-OHD correlated inversely with those in PTH and PINP. Conclusions: vitamin D supplementation has minor effects on PTH and bone turnover in chronically immobilised aged patients with VDD. Further comparative studies and meta-analyses are warranted to elucidate the confounding effects of different mobility levels on the benefits of vitamin D supplementation in patients with differing baseline PTH levels." @default.
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• W2137342019 date "2007-10-25" @default.
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• W2137342019 title "Vitamin D supplementation has minor effects on parathyroid hormone and bone turnover markers in vitamin D–deficient bedridden older patients" @default.
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• W2137342019 doi "https://doi.org/10.1093/ageing/afm141" @default.
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