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Vitamin D Status Among Competitive Female Gymnast and Swimmers After Winter Time

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT03584256
Recruitment Status : Completed
First Posted : July 12, 2018
Last Update Posted : July 12, 2018
Barbara Jakše s.p.
Information provided by (Responsible Party):
University of Ljubljana

Brief Summary:
As indoor athletes, competitive gymnasts and swimmers can face the problem of a potential vitamin D deficiency. In the last decades, indoor sports participants have been faced with the problem of an institutionalized lifestyle and, in some places, a lower exposure to sun, which is also associated with the geographical area with a lower or higher UV index, especially in autumn, winter, and early spring (from October to April), when the day is shorter and the clock shifts to winter time. The problem with gymnasts and swimmers lies in daily trainings in the gym and pool and in the daily rest between two trainings, which can be spend more or less institutionally. The investigators wanted to examine the vitamin D status related to bone mineral density, body composition and various cardiovascular markers among young competitive gymnasts and swimmers after winter time. The investigators want to potentially give more solid but sensible recommendations for trainers, athletes, parents and sports doctors when it comes to vitamin D supplementations for indoor female athletes.

Condition or disease
Vitamin D Deficiency Injuries Cardiovascular Risk Factor Nutritional Deficiency

Detailed Description:

In this cross-sectional survey, the investigators will document vitamin D and the status of other micronutrients related to bone mineral density, body composition and a variety of risk factors for chronic non-communicable diseases.

The investigators hypothesize that there exists a serious problem of vitamin D deficiency among indoor athletes related to bone health, injuries and general health - especially when they are not using supplements. It is well known that vitamin D may improve athletic performance in vitamin D-deficient athletes.

International and national-level female gymnasts and swimmers that will be enrolled will sign an informed consent statement for the inclusion in this survey and the choice to participate in the study will be made by coaches and participants themselves and, in the event of females under 18 years of age, also by their parents, in accordance with the Helsinki declaration.

The investigators plan to enroll at least 30 female participants (15 gymnasts and 15 swimmers) who compete on an international and national level and are older than 12 years of age.

The investigators will measure the athletes' biochemistry in overnight fasted state (micronutrients, including vitamin D (25(OH)D), B12, Ca, Fe, Mg, K and P, lipids, liver enzymes, glucose, creatinine, etc.), their seated blood pressure status, bone mineral density (also segmental) and body composition, using Dual-energy X-ray absorptiometry (DXA), their dietary choice and nutrition intake status, using standardized Food frequency questionnaire (FFQ), their training characteristics, injury status and menstrual status. Athletes who are using vitamin D supplements or who have attended a one-month training camp in the southern geographical zone (Africa) will serve us as control group.

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Study Type : Observational
Actual Enrollment : 31 participants
Observational Model: Cohort
Time Perspective: Cross-Sectional
Official Title: Vitamin D Status Relate to Bone Mineral Density, Body Composition and Variey Cardiovascular Risk Factors Among Competitive Female Gymnasts and Swimmers After Winter Time
Actual Study Start Date : April 5, 2018
Actual Primary Completion Date : April 6, 2018
Actual Study Completion Date : April 6, 2018

Resource links provided by the National Library of Medicine

Female gymnasts, older than 13 years, with status of ineternational or national level,
Female swimmers, older than 12 years, with status of ineternational or national level,

Primary Outcome Measures :
  1. Differences between female gymnasts and swimmers of vitamin D status [ Time Frame: April 2018 ]
    Serum 25(OH)D (ng/ml) status after winter time

Secondary Outcome Measures :
  1. Differences between female gymnasts and swimmers of bone mineral density status [ Time Frame: April 2018 ]
    Bone mineral density status (g/cm3) using DEXA

Other Outcome Measures:
  1. Differences between female gymnasts and swimmers of body composition status [ Time Frame: April 2018 ]
    Lean and fat tissue mass (%) assessed dy DEXA

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   12 Years and older   (Child, Adult, Older Adult)
Sexes Eligible for Study:   Female
Gender Based Eligibility:   Yes
Sampling Method:   Non-Probability Sample
Study Population

Inclusion Criteria:

  • international and national level
  • Signed informed consent for participation in the study

Exclusion Criteria:


Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT03584256

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Faculty of Sport
Ljubljana, Slovenia, 1000
Sponsors and Collaborators
University of Ljubljana
Barbara Jakše s.p.
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Principal Investigator: Ivan Čuk University of Ljubljana, Faculty of Sport, Slovenia

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Responsible Party: University of Ljubljana Identifier: NCT03584256    
Other Study ID Numbers: 0120-177/2018
First Posted: July 12, 2018    Key Record Dates
Last Update Posted: July 12, 2018
Last Verified: July 2018
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: Undecided

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Additional relevant MeSH terms:
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Vitamin D Deficiency
Deficiency Diseases
Nutrition Disorders