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Published in: European Journal of Nutrition 3/2019

01-04-2019 | Original Contribution

Winter vitamin D3 supplementation does not increase muscle strength, but modulates the IGF-axis in young children

Authors: Charlotte Mortensen, Christian Mølgaard, Hanne Hauger, Michael Kristensen, Camilla T. Damsgaard

Published in: European Journal of Nutrition | Issue 3/2019

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Abstract

Purpose

To explore whether muscle strength, the insulin-like growth factor axis (IGF-axis), height, and body composition were associated with serum 25-hydroxyvitamin D [25(OH)D] and affected by winter vitamin D supplementation in healthy children, and furthermore to explore potential sex differences.

Methods

We performed a double-blind, placebo-controlled, dose–response winter trial at 55ºN. A total of 117 children aged 4–8 years were randomly assigned to either placebo, 10, or 20 µg/day of vitamin D3 for 20 weeks. At baseline and endpoint, we measured muscle strength with handgrip dynamometer, fat mass index (FMI), fat free mass index (FFMI), height, plasma IGF-1, IGF-binding protein 3 (IGFBP-3), and serum 25(OH)D.

Results

At baseline, serum 25(OH)D was positively associated with muscle strength, FFMI, and IGFBP-3 in girls only (all p < 0.01). At endpoint, baseline-adjusted muscle strength, FMI and FFMI did not differ between intervention groups. However, baseline-adjusted IGF-1 and IGFBP-3 were higher after 20 µg/day compared to placebo (p = 0.043 and p = 0.006, respectively) and IGFBP-3 was also higher after 20 µg/day compared to 10 µg/day (p = 0.011). Children tended to be taller after 20 µg/day compared to placebo (p = 0.064). No sex interactions were seen at endpoint.

Conclusions

Avoiding the winter-related decline in serum 25(OH)D may influence IGF-1 and IGFBP-3 in children. Larger trials are required to confirm these effects, and the long-term implication for linear growth.
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Metadata
Title
Winter vitamin D3 supplementation does not increase muscle strength, but modulates the IGF-axis in young children
Authors
Charlotte Mortensen
Christian Mølgaard
Hanne Hauger
Michael Kristensen
Camilla T. Damsgaard
Publication date
01-04-2019
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Nutrition / Issue 3/2019
Print ISSN: 1436-6207
Electronic ISSN: 1436-6215
DOI
https://doi.org/10.1007/s00394-018-1637-x

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