Vitamin D Status and Muscle Function

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

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.

Study Overview

• Status: Completed
• Conditions: Vitamin D Status; Muscle Function
• Intervention / Treatment: 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 Type: Observational
• Enrollment (Actual): 29

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 16 years to 35 years (Child, Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

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 Plan

How is the study designed?

Design Details

• Observational Models: Cohort
• Time Perspectives: Prospective

Number of groups / cohorts

1

Cohorts and Interventions

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

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Serum 25-hydroxyvitamin D (s-25(OH)D)	2 months

Secondary Outcome Measures

Outcome Measure	Time Frame
Food frequency questionnaire	One week
Hand-grip strength	2 months

Collaborators and Investigators

• Sponsor: University of Copenhagen
• Collaborators: Hvidovre University Hospital; Bispebjerg Hospital; Team Denmark; Danmarks Fødevareforskning

Study record dates

Study Major Dates

• Study Start: February 1, 2007
• Primary Completion (Actual): April 1, 2007
• Study Completion (Actual): April 1, 2007

Study Registration Dates

• First Submitted: July 27, 2016
• First Submitted That Met QC Criteria: August 5, 2016
• First Posted (Estimate): August 8, 2016

Study Record Updates

• Last Update Posted (Estimate): October 27, 2016
• Last Update Submitted That Met QC Criteria: October 26, 2016
• Last Verified: October 1, 2016

More Information

Terms related to this study

• Other Study ID Numbers: KF01322182

Plan for Individual participant data (IPD)

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