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Local dynamic stability (LDS) quantifies how a system responds to smallperturbations. Several experimental and clinical findings have highlighted theassociation between gait LDS and fall risk. Walking without shoes is known toslightly modify gait parameters. Barefoot walking (BW) may cause unusualsensory feedback to individuals accustomed to shod walking (SW), and this mayimpact on LDS. The objective of this study was therefore to compare the LDS ofSW and BW in healthy individuals and to analyze the intrasession repeatability.Forty participants traversed a 70 m indoor corridor wearing normal shoes in onetrial and walking barefoot in a second trial. Trunk accelerations were recordedwith a 3D-accelerometer attached to the lower back. The LDS was computed usingthe finite-time maximal Lyapunov exponent method. Absolute agreement betweenthe forward and backward paths was estimated with the intraclass correlationcoefficient (ICC). BW did not significantly modify the LDS as compared to SW(average standardized effect size: +0.12). The intrasession repeatability washigh in SW (ICC: 0.73-0.79) and slightly higher in BW (ICC: 0.82-0.88).Therefore, it seems that BW can be used to evaluate LDS without introducingbias as compared to SW, and with a sufficient reliability.

To what extent does not wearing shoes affect the local dynamic stability of the gait? Effect size and intra-session repeatability