Journal article
Vitamin D Status and Muscle Function Among Adolescent and Young Swimmers
Copenhagen University Hospital Herlev and Gentofte1
University College Copenhagen2
Aarhus University3
Rigshospitalet4
National Food Institute, Technical University of Denmark5
Research Group for Bioactives – Analysis and Application, National Food Institute, Technical University of Denmark6
Frederiksberg Kommune7
University of Copenhagen8
Impaired muscle function has been coupled to vitamin D insufficiency in young women and in elderly men and women. Those living at Northern latitudes are at risk of vitamin D insufficiency due to low sun exposure which may be more pronounced among elite swimmers because of their indoor training schedules.
We aimed to examine vitamin D status among young elite swimmers and evaluate the association between vitamin D status and muscle strength. Twenty-nine swimmers, 12 female and 17 male (16-24 years) residing at latitude 55-56°N were studied in March and April. Blood samples were analysed for serum 25-hydroxyvitamin D (s-25(OH)D) and hand-grip strength was measured as marker of muscle strength.
Subjects' vitamin D and calcium intake were assessed by food frequency questionnaire and sun exposure and training status by questionnaires. Mean (±SD) s-25(OH)D was 52.6 ± 18.3nmol/L among all swimmers. In 45% of the swimmers s-25(OH)D was below 50 nmol/L. Female swimmers had higher s-25(OH)D concentration than male swimmers (61.7 ± 17,5 nmol/L vs. 46.2 ± 16,5 nmol/L, p= 0.026).
Among male swimmers, those with sufficient vitamin D status had higher hand grip strength than those with insufficient vitamin D status (50.6 ± 6.4 kg vs. 41.1 ± 7.8 kg, p = 0.02). Among Danish elite swimmers 45% had an insufficient vitamin D status during the spring; the prevalence being higher among male swimmers.
Muscle strength was significantly higher in male swimmers with sufficient vitamin D status.
Language: | English |
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Year: | 2017 |
Pages: | 399-407 |
ISSN: | 15432742 , 1526484x and 10501606 |
Types: | Journal article |
DOI: | 10.1123/ijsnem.2016-0248 |
ORCIDs: | 0000-0002-9383-8202 , 0000-0003-4299-0500 and Jakobsen, Jette |