Strength and Balance in Gender- and Age-Matched Controls

The purpose of this study is to learn more about balance and strength in an elderly population (60 and older). Data will be compared between controls and the age/gender- matched PD participants in study "The Effects of vitamin D on Balance in Parkinson's disease" (OHSU IRB # 6482). Specifically a t-test will be used to compare total work and total power on leg extension and flexion, composite SOT score conditions 1-3 and 4-6, response strength and latency on MCT, and turn duration from the iMOBILITY between the two groups.