PVAMC / OHSU D: The Effect of Vitamin D on Balance in Parkinson's Disease

Principal Investigator

Amie Hiller

Study Purpose

Previous studies have suggested that vitamin D supplementation decreases both fractures and falls in the elderly. People with PD are at higher risk of falling due to their motor problems. Despite medical therapy, 70% of persons with PD experience at least one fall per year. Falls can lead to fractures and other injuries, which can be costly to treat. If supplemental vitamin D prevents people with PD from falling so frequently, their quality of life will increase.

The main purpose of this study is to examine whether vitamin D supplementation improves balance in persons with Parkinson's disease (PD). We will also investigate whether vitamin D affects balance by improving muscle strength or mental abilities. Finally, we will evaluate whether vitamin D supplementation improves the quality of life for people with PD.

Medical Condition(s)

Parkinson's disease

Eligibility Criteria

Between 50 and 99
Parkinson's disease
Able to walk 50 feet without assistant
No history of renal stones or hypercalcaemia
No other vitamin D supplement

Age Range

50 - 99

Healthy Volunteers Needed


Duration of Participation

24 weeks

Minors Included



Brenna Lobb, MS, MPH
(503) 220 - 8262 extension 51871


Portland VA Medical Center

Recruitment End


Compensation Provided



$10 per visit, a total of $60 for all visits.

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