Nonlinear Dynamic Measures for Evaluating Postural Control in Individuals With and Without Chronic Ankle Instability

in Motor Control
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This study aimed to compare time-to-boundary and sample entropy during a single-leg balance task between individuals with chronic ankle instability (CAI), lateral ankle sprain copers, and healthy controls. Twenty-two participants with CAI, 20 lateral ankle sprain copers, and 24 healthy controls performed a single-leg balance task during an eyes-closed condition. Participants with CAI exhibited lower time-to-boundary values compared with lateral ankle sprain copers and healthy controls. However, we did not find differences in sample entropy variables between cohorts. A decrease in time-to-boundary values in participants with CAI indicated that CAI may constrain the ability of the sensorimotor system to maintain the center of pressure within the boundaries of the base of support. However, the regularity of the center of pressure velocity time series appears not to be altered in the CAI cohort in this study.

Terada is with Ritsumeikan University, Shiga, Japan. Beard is with Capital University, Columbus, OH. Carey is with Ascension Healthcare, Franklin, WI. Pfile is with the College of Charleston, Charleston, SC. Pietrosimone is with the University of North Carolina at Chapel Hill, Chapel Hill, NC. Rullestad is with Grand View University, Des Moines, IA. Whitaker is with Delta Physical Therapy, Swanton, OH. Gribble is with the University of Kentucky, Lexington, KY.

Address author correspondence to Masafumi Terada at mterada@fc.ritsumei.ac.jp.
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