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  • Title: Effect of vitamin D3 treatment on endothelial function in obese adolescents.
    Author: Javed A, Kullo IJ, Balagopal PB, Kumar S.
    Journal: Pediatr Obes; 2016 Aug; 11(4):279-84. PubMed ID: 26273791.
    Abstract:
    BACKGROUND: Obesity in children is associated with vitamin D deficiency and endothelial dysfunction. It is not known if treatment with vitamin D improves endothelial function in obese adolescents. OBJECTIVE: This study aimed to determine whether treatment with vitamin D3 improves endothelial function in obese adolescents. METHODS: Nineteen obese adolescents, 13-18 years of age, with 25-hydroxy vitamin D (25[OH]D) levels <75 nmol L(-1) were treated with 100 000 IU vitamin D3 orally once a month for 3 months in an open-label, single-centre prospective trial. Endothelial function was assessed by flow-mediated dilatation (FMD) of the brachial artery at study entry and 1 month after the third dose of vitamin D3 . Biochemical parameters, including calcium, fasting lipids, glucose, insulin and high-sensitivity C-reactive protein, were also obtained. RESULTS: Mean 25(OH)D levels increased from 55.9 ± 12.2 to 86.9 ± 16.7 nmol L(-1) (P < 0.01). There was no correlation between 25(OH)D levels and brachial artery FMD. The brachial artery FMD (%) did not change significantly following vitamin D3 treatment (9.5 ± 3.53 vs. 10.3 ± 3.83, P = 0.83). Serum parathyroid hormone declined from 3.8 ± 1.5 to 3.1 ± 1 pmol L(-1) (P = 0.01). The remainder of biochemical measurements did not show a significant change. CONCLUSIONS: Treatment with vitamin D3 , 100 000 IU once a month for 3 months was effective in increasing 25(OH)D levels in obese adolescents but did not impact endothelial function.
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