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The Effect of Vitamin D Supplementation on Muscle Power in Elite Cyclist
NCT01518725 · View on ClinicalTrials.gov ↗
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 Studied
Interventions
- DIETARY_SUPPLEMENT Placebo
- DIETARY_SUPPLEMENT Vitamin D
Study Locations (1)
Oklahoma
- Oklahoma State University — Stillwater
Trial Details
| Field | Value |
|---|---|
| Enrollment Target | 103 participants |
| Start Date | 2012-01 |
| Est. Completion | 2013-08 |
| Phase | Phase 4 |
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Full Details on ClinicalTrials.gov ↗What the Registry Record Tells You About NCT01518725
The ClinicalTrials.gov registry entry for NCT01518725 describes a study currently listed as completed. It is categorized as Phase 4, which is the standard way researchers label where a study sits along the investigational pathway from early safety work through later efficacy and post-marketing evaluation. The registered enrollment target is 103 participants, a figure that helps gauge the scale of data the investigators plan to collect. The listed sponsor is Oklahoma State University, which has 7 total studies on file at ClinicalTrials.gov, and sponsors are the parties responsible for study design, oversight, and regulatory filings.
The record links to 1 condition, with Muscle Power appearing as the primary indexed condition, and to 2 interventions — of which Placebo is the first listed. Interventions can include drugs, devices, procedures, behavioral programs, or observational arms, and each is tracked as a separate registry field so that downstream queries can filter accurately. When a trial lists multiple interventions, it usually reflects a multi-arm design or a comparison protocol rather than a single treatment being tested in isolation. The brief summary published in the registry is the clearest source of protocol intent and should be read before drawing conclusions from any sidebar tags.
Geographic footprint matters for practical reasons: NCT01518725 reports 1 study location spanning 1 distinct geographic area — top geographies include Oklahoma. A larger site network tends to correlate with broader recruitment capacity, but it does not imply anything about study quality, and site-level enrollment status can diverge from the overall registry status shown above. Every data point on this page comes from the public ClinicalTrials.gov dataset and is reproduced here for reference only; it is not a medical recommendation, an endorsement of the sponsor, or an invitation to enroll. Verify current status, eligibility criteria, and contact details directly at ClinicalTrials.gov, and discuss any participation decision with your own healthcare provider.
Frequently Asked Questions
What is clinical trial NCT01518725 about?
NCT01518725 is a clinical study titled "The Effect of Vitamin D Supplementation on Muscle Power in Elite Cyclist". 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 athlet...
What is the current status of trial NCT01518725?
This trial is currently completed. It is a Phase 4 study. The enrollment target is 103 participants. The study started on 2012-01. Estimated completion is 2013-08.
What conditions does trial NCT01518725 study?
This clinical trial studies the following conditions: Muscle Power. These conditions were identified from the trial registry and reflect the primary focus areas of the research.
What interventions are being tested in trial NCT01518725?
The interventions under investigation include: Placebo (DIETARY_SUPPLEMENT), Vitamin D (DIETARY_SUPPLEMENT). Each intervention is being evaluated for safety and efficacy as part of this clinical study.
Who is sponsoring clinical trial NCT01518725?
This trial is sponsored by Oklahoma State University, which has 7 total clinical trials registered on ClinicalTrials.gov. The sponsor is responsible for the study's design, funding, and regulatory compliance.
Where is trial NCT01518725 being conducted?
This trial has 1 study location across Oklahoma. Contact the study sites directly through ClinicalTrials.gov for enrollment availability.
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