Effects of Vitamin D Supplementation on Strength, Bone Density, and Injury Risk in Collegiate Athletes

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

EARLY_PHASE1

Total Enrollment

68 participants

Study Classification

INTERVENTIONAL

Study Start Date

2017-04-29

Study Completion Date

2018-06-01

Brief Summary

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The goal of this study is to determine whether Vitamin D supplementation improves strength and bone density, and reduces the risk of injury in collegiate athletes.

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Detailed Description

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Vitamin D is a hormone that is important for bone and muscle health. As such, not having enough vitamin D in your body is associated with increased risk of injury and reduced health and athletic performance. It is often recommended that individuals who have low levels of vitamin D take vitamin D supplements. However, the effects of vitamin D supplementation on health and strength gains in collegiate athletes are not known. The goal of this study is to determine whether vitamin D supplementation increases strength and bone density, while reducing the risk of injury in collegiate athletes. Fasting vitamin D concentrations will be measured and athletes will be supplemented daily with Vitamin D for 8-12 weeks. The amount of supplementation will depend on whether the athlete is categorized as sufficient (\>30ng/ml), insufficient (20-35ng/ml), or deficient (\<20ng/ml). Vitamin D concentrations, strength, bone density, and injury risk will be assessed before and after the intervention period.

Conditions

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Vitamin D Deficiency

Study Design

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Allocation Method

NON_RANDOMIZED

Intervention Model

PARALLEL

Subjects will either receive placebo, 5000IU, or 10000IU per day of Vitamin D for 8-12 weeks.

Primary Study Purpose

PREVENTION

Blinding Strategy

TRIPLE

Participants Investigators Outcome Assessors

Any individuals involved in study measures will also be masked.

Study Groups

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Vitamin D - 10000IU

These individuals have been categorized as Vitamin D deficient and will receive 10000IU of Vitamin D per day.

Group Type EXPERIMENTAL

Vitamin D 10000 UNT

Intervention Type DRUG

10000 IU Vitamin D per day

Vitamin D - 5000IU

These individuals have been categorized as Vitamin D insufficient and will receive 5000IU of Vitamin D per day.

Group Type EXPERIMENTAL

Vitamin D 5000 UNT

Intervention Type DRUG

5000 IU Vitamin D per day

Placebo

These individuals have been categorized as Vitamin D sufficient and will receive placebo.

Group Type NO_INTERVENTION

No interventions assigned to this group

Interventions

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Vitamin D 10000 UNT

10000 IU Vitamin D per day

Intervention Type DRUG

Vitamin D 5000 UNT

5000 IU Vitamin D per day

Intervention Type DRUG

Eligibility Criteria

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Inclusion Criteria

* athlete for a sanctioned Virginia Tech sport

Exclusion Criteria

* pregnant or trying to become pregnant, currently taking vitamin D (\>600IU/day), calcium (\>1000mg/dl), taking any performance enhancing supplements (example, creatine), or any other medication or nutritional supplements that might influence the study variables, cardiac or thyroid problems, have diabetes, or epilepsy

Minimum Eligible Age

18 Years

Maximum Eligible Age

30 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes