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CompletedNCT03325686Updated Oct 30, 2017

Vitamin D Supplementation in Physical Performance

An interventional study of vitamin D supplement and Placebo in Healthy and Athletes, sponsored by National Nutrition and Food Technology Institute. Completed at 1 site in Iran, Islamic Republic of. Open to participants aged 18 Years to 30 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2017-10-30.

Sponsored by National Nutrition and Food Technology Institute · Not applicable, Interventional, and Prevention

From the registry’s dates

  • Registered 7 months after the study started (first participant enrolled Mar 2017, registered Oct 2017).
Phase
Not applicable
Study type
Interventional
Enrollment
70
Allocation
Randomized
Ages
18 Years to 30 Years
Sex
All
01

Study summary

This study was performed to evaluate the efficacy of weekly vitamin D supplementation on athletic performance in Iranian athletes

Read the detailed description

Seventy subjects were enrolled in the study. The athletes were randomly divided into two groups: vitamin D supplement (D; received 50,000 IU of vitamin D supplement weekly) and control (P, received a placebo weekly). Duration of the study was eight weeks. Anthropometric, dietary, athletic performance and biochemical evaluations were performed for all subjects in the beginning and in the end of the intervention period.

02

Conditions studied

  • Healthy
  • Athletes

Keywords

  • vitamin D
  • atletes
  • physical performance
03

In context

Lead sponsor

National Nutrition and Food Technology Institute is the lead sponsor of 63 studies on the registry; 7 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 30 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • healthy
  • professional athletes

Exclusion criteria

Exclusion Criteria:

  • receiving vitamin D supplement in past 3 months
05

Study design

Phase
Not applicable
Primary purpose
Prevention
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Triple (Participant, Care provider, Outcomes assessor)
Enrollment
70 participants (actual)

Study arms

  • Experimental
    vitamin D supplement

    D

    Dietary Supplement: vitamin D supplement

  • Placebo comparator
    control

    P

    Other: Placebo

Interventions

  • Dietary supplementvitamin D supplement

    D; received 50,000 IU of vitamin D supplement weekly

    Also known as: D

  • OtherPlacebo

    placebo

    Also known as: P

06

What researchers measure

Primary outcomes

  1. Changes from baseline serum 25-hydroxy vitamin D at eight weeks

    nmol/L

    Time frame: 8 weeks

Secondary outcomes

  1. Changes from baseline Truncal Fat at eight weeks

    percent

    Time frame: 8 weeks

  2. Changes from baseline visceral fat at eight weeks

    percent

    Time frame: 8 weeks

  3. Changes from Strength leg press at 8 weeks

    percent

    Time frame: 8 weeks

  4. Changes from Ergojump at 8 weeks

    percent

    Time frame: 8 weeks

  5. Changes from baseline Vertical jump at 8 weeks

    percent

    Time frame: 8 weeks

  6. Change from baseline Agility at 8 weeks

    percent

    Time frame: 8 weeks

  7. changes from Speed at 8 weeks

    percent

    Time frame: 8 weeks

07

Study locations

1 site
  • National Nutrition and Food Technology Research Institute
    Tehrān, Tehran, Iran, Islamic Republic of
08

References and documents

Individual participant data

Plan to share: Undecided

No publications or documents are linked to this record.

09

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reached

Ran from Mar 2017 to primary completion in Sep 2017, 6 months.

How these figures are worked out, and which studies are left out of them.

Registered
Oct 20, 2017
First posted
Oct 30, 2017
StartActual
Mar 1, 2017
Primary completionActual
Sep 1, 2017
CompletionActual
Sep 30, 2017
Last update
Oct 30, 2017
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Oct 30, 2017, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT03325686
Lead sponsor
National Nutrition and Food Technology Institute
Responsible party
Tirang R. Neyestani, Ph.D. (Professor, National Nutrition and Food Technology Institute) — Principal investigator
First posted
Oct 30, 2017
Start date
Mar 1, 2017
Primary completion
Sep 1, 2017
Completion
Sep 30, 2017
Last update
Oct 30, 2017

Study contacts

Tirang R. Neyestani, PhD
study chair · Laboratory of Nutrition Research, National Nutrition and Food Technology Research Institute (NNFTRI) and Faculty of Nutrition Science and Food Technology, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Oversight

FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Oct 2017. You cannot join it, but the record below documents what was studied.

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Discussion

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Studies of the drug tested here: Vitamin D

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National Nutrition and Food Technology Institute

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