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Completed

NCT Number: NCT02858882

Vitamin D Status and Muscle Function

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.

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Key information

Conditions

Vitamin D Status Muscle Function

Age range

16 year–35 year

Sex eligibility

All sexes

Study type

Observational

About this study

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.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

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

Treatment and study plan

Screening

Other

Screening of elite swimmers

Primary outcomes

  1. Serum 25-hydroxyvitamin D (s-25(OH)D)

    Time frame: 2 months

Secondary outcomes

  1. Food frequency questionnaire

    Time frame: One week

  2. Hand-grip strength

    Time frame: 2 months

Sponsors and collaborators

Lead sponsor

University of Copenhagen

Other

Collaborators

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

Registry information

Official study title

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

Important dates

Study start
2007
Primary completion
2007
Study completion
2007
First posted
Aug 8, 2016
Registry last updated
Oct 27, 2016

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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