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The Effect of Vitamin D Supplementation on Muscle Power in Elite Cyclist

NCT01518725 · Status: COMPLETED · Phase: PHASE4 · Type: INTERVENTIONAL · Enrollment: 103

Last updated 2015-04-29

No results posted yet for this study

Summary

The purpose of this study is to evaluate the change in vitamin D status with the change in muscular strength and muscular power in highly trained athletes over a 9-month study period. The investigators hypothesize that the greatest muscular strength and power gains will be demonstrated in the athletes who achieve and maintain a 25(OH)-D \> 50 ng/mL (but \< 100 ng/mL) over the 6 month study duration.

This hypothesis will be tested by carrying out the following specific aims: Aim 1. to determine the extent to which increasing serum 25(OH)D to \> 50 ng/mL is associated with improved muscular power by assessing specific performance measures (e.g. Vertical Jump Test and Wingate test) relative to lean body mass; and Aim 2. to examine the correlation between vitamin D status and muscular power over time.

Conditions

  • Muscle Power

Interventions

DIETARY_SUPPLEMENT

Vitamin D

The vitamin D supplementation will consist of a capsule of 100 mcg of vitamin D/d, to be taken throughout the day. Participants will achieve 100 mcg by taking 2 x 25 mcg capsules per day. One will be taken at each time point (i.e., morning and evening) throughout the day. They will take the vitamin D supplement for the 6 month intervention period

DIETARY_SUPPLEMENT

Placebo

Participants in the placebo group will receive a capsule containing the inactive ingredients that include cellulose and silica to create a gel-like substance

Sponsors & Collaborators

  • Mid America Athletic Training Association

    collaborator UNKNOWN

  • Oklahoma State University

    lead OTHER

Principal Investigators

  • Rachel A Hildebrand, M.Ed · Oklahoma State University

  • Brenda Smith, PhD · Oklahoma State University

Study Design

Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
TRIPLE
Model
PARALLEL

Eligibility

Min Age
18 Years
Max Age
35 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2012-01-31
Primary Completion
2013-08-31
Completion
2013-08-31

Countries

  • United States

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT01518725 on ClinicalTrials.gov