The Effects of Vitamin D Supplementation on Aerobic Fitness in Athletes (VDAF)

Ulster University

Status and phase

Completed

Phase 4

Conditions

Aerobic Fitness (VO2max)

Treatments

Dietary Supplement: Placebo

Dietary Supplement: Vitamin D

Study type

Interventional

Funder types

Other

Identifiers

NCT02278172

REC14.0087

Details and patient eligibility

About

The primary aim of the study is to identify if vitamin D3 supplementation influences VO2max in athletes.

Secondary aims are to determine if vitamin D3 supplementation impacts on measures of muscle function, lung function, body composition, immune function and the self-reported incidence of upper respiratory tract infection.

This double-blind, randomised, placebo-controlled trial is of parallel design and will aim to recruit a total of 50 athletes randomised into either a placebo or treatment group for a 12-week intervention.

Enrollment

44 patients

Sex

All

Ages

18+ years old

Volunteers

Accepts Healthy Volunteers

Inclusion criteria

Athletes whose sport does not primarily consist of an anaerobic component
Apparently healthy
Over the age of 18

Exclusion criteria

Resting arterial hypertension
Individuals who are not an athlete at a University/local sports team
Athletes who predominantly utilise anaerobic energy systems
Athletes under the age of 18
Those that have consumed a supplement containing vitamin D (greater than 400IU/day) or iron supplements for up to 30 days prior to starting the study
Those with health conditions identified by the screening questionnaire
Individuals that are on prescribed medication that is known to affect vitamin D metabolism
Those following a vegan diet
Those with a physical disability that would prevent successful completion of the exercise test
Those who have either had a sun holiday in the 4 weeks prior to starting the study
Those planning a sun holiday during the intervention period