Muscle Function, Vitamin D Status
Conditions
Brief summary
People living at Northern latitudes are at risk of suffering from vitamin D insufficiency due to low sun exposure and the risk may be even more pronounced among elite swimmers since indoor training further reduces sun exposure. In light of this, the investigators want to examine vitamin D status in young elite swimmers and if there is an association between vitamin D status and muscle strength.
Detailed description
To examine vitamin D status in young elite swimmers and if there is an 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 included to the trial conducted in March-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.
Interventions
OTHERScreening
Screening of elite swimmers
Sponsors
Team Denmark
Hvidovre University Hospital
Danmarks Fødevareforskning
Bispebjerg Hospital
University of Copenhagen
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
16 Years to 35 Years
Healthy volunteers
Yes
Inclusion criteria
Age: 16-35 years Top atlets, conducting: * Hard physical activity * Indoor elitesport min. 10 hours a week * Healthy, without use of any medications * Eat fish max 2 times per week
Exclusion criteria
* Use of corticosteroids * Illness * Use of supplements * Use of solarium * Donation of blood within the last 3 months * Having spent time below the latitude of 42° north from September through April
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Serum 25-hydroxyvitamin D (s-25(OH)D) | 2 months |
Secondary
| Measure | Time frame |
|---|---|
| Food frequency questionnaire | One week |
| Hand-grip strength | 2 months |
Outcome results
None listed