Reliability and minimal detectable change of nonlinear analysis measure of postural control in older adults with mild cognitive impairment.

Background: Evaluating quiet stance under various conditions using nonlinear analysis may be an effective method of measuring postural control in older adults with mild cognitive impairment (MCI). However, no studies have examined the reliability of using sample entropy (SampEn) in older adults with MCI.

Research Question: What are the within- and between-session reliability and minimal detectable change (MDC) of a nonlinear analysis measure of postural control during quiet stance in older adults with MCI?

Methods: Fourteen older adults with MCI performed static standing under four conditions, and the center of pressure signal was calculated and applied to SampEn nonlinear analysis.