Vitamin D Status and Muscle Function

Vitamin D Status Clinical Trial

Official title:

Vitamin D Status and Muscle Function Among Adolescent and Young Swimmers.

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT02858882
• Other study ID #: KF01322182
• Status: Completed
• Phase: N/A
• First received: July 27, 2016
• Last updated: October 26, 2016
• Start date: February 2007
• Est. completion date: April 2007

Study information

• Verified date: October 2016
• Source: University of Copenhagen
• Contact: n/a
• Is FDA regulated: No
• Health authority: Denmark: Ethics Committee
• Study type: Observational

Clinical Trial 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.

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.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 29
• Est. completion date: April 2007
• Est. primary completion date: April 2007
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: Both
• Age group: 16 Years to 35 Years

Eligibility

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

Observational Model: Cohort, Time Perspective: Prospective

Related Conditions & MeSH terms

• Muscle Function
• Vitamin D Status

Intervention

Other:
• Screening
Screening of elite swimmers

Locations

Country	Name	City	State
n/a

Sponsors (5)

Lead Sponsor	Collaborator
University of Copenhagen	Bispebjerg Hospital, Danmarks Fødevareforskning, Hvidovre University Hospital, Team Denmark

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Serum 25-hydroxyvitamin D (s-25(OH)D)		2 months	No
Secondary	Food frequency questionnaire		One week	No
Secondary	Hand-grip strength		2 months	No