Vitamin D Status and Muscle Function

• Sponsor: University of Copenhagen (Other)
• Overall Status: Completed
• CT.gov ID: NCT02858882
• Collaborator: Team Denmark (Other), Hvidovre University Hospital (Other), Danmarks Fødevareforskning (Other), Bispebjerg Hospital (Other)
• Enrollment: 29
• Duration (Months): 1.9

Study Details

Study Description

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.

Condition or Disease	Intervention/Treatment	Phase
Vitamin D Status; Muscle Function	Other: Screening

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 Design

• Study Type: Observational
• Actual Enrollment: 29 participants
• Observational Model: Cohort
• Time Perspective: Prospective
• Official Title: Vitamin D Status and Muscle Function Among Adolescent and Young Swimmers.
• Study Start Date: Feb 1, 2007
• Actual Primary Completion Date: Apr 1, 2007
• Actual Study Completion Date: Apr 1, 2007

Arms and Interventions

Arm	Intervention/Treatment
Swimmers Screening of elite athletes	Other: Screening; Screening of elite swimmers

Outcome Measures

Primary Outcome Measures

1. Serum 25-hydroxyvitamin D (s-25(OH)D) [2 months]

Secondary Outcome Measures

1. Food frequency questionnaire [One week]

2. Hand-grip strength [2 months]

Eligibility Criteria

Criteria

• Ages Eligible for Study: 16 Years to 35 Years
• Sexes Eligible for Study: All
• Accepts 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

Contacts and Locations

Locations

No locations specified.

Sponsors and Collaborators

• University of Copenhagen
• Team Denmark
• Hvidovre University Hospital
• Danmarks Fødevareforskning
• Bispebjerg Hospital

Investigators

None specified.

Study Documents (Full-Text)

None provided.

More Information

Publications

None provided.

• Responsible Party: Arne Astrup, Professor, University of Copenhagen
• ClinicalTrials.gov Identifier: NCT02858882
• Other Study ID Numbers: KF01322182
• First Posted: Aug 8, 2016
• Last Update Posted: Oct 27, 2016
• Last Verified: Oct 1, 2016

• Individual Participant Data (IPD) Sharing Statement: No
• Plan to Share IPD: No

Study Results

No Results Posted as of Oct 27, 2016