Vitamin D Status and Muscle Function

Completed

• Conditions: Vitamin D Status; Muscle Function
• Interventions: Other: Screening

• Registration Number: NCT02858882
• Lead Sponsor: University of Copenhagen

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.

Study Timeline

• Study Start: 2007-02
• Primary Completion: 2007-04
• Study Completion: 2007-04
• Study First Submitted: 2016-07-27
• Study First Submitted QC: 2016-08-05
• Study First Posted: 2016-08-08
• Status Verified: 2016-10
• Last Update Submitted: 2016-10-26
• Last Update Posted: 2016-10-27

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 29

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

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
Swimmers	Screening	Screening of elite athletes

Primary Outcome Measures

Name	Time	Method
Serum 25-hydroxyvitamin D (s-25(OH)D)	2 months

Secondary Outcome Measures

Name	Time	Method
Hand-grip strength	2 months
Food frequency questionnaire	One week