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

Completed · Phase 4 · Has a placebo group

Conditions studied: Muscle Power

In brief

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.

Key facts

Study ID

NCT01518725

Run by

Oklahoma State University

People needed

103

Starts

2012-01-01

Expected to finish

2013-08-01

Last updated by the study team

2015-04-29

Who can join

Age: 18 and older, up to 35. Sex: any. Healthy volunteers: accepted.

You may qualify if…

• Elite Cyclist (level 1,2 or 3)

You may not qualify if…

• Currently prescribed vitamin D without physician approval to participate in study
• Participants who respond "yes' to PAR-Q and do not get physician approval to participate in study

Where it is running

• Oklahoma State University — Stillwater, Oklahoma, United States

Full record on ClinicalTrials.gov

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