Scaling exponents of spatio-temporal gait parameters for five treadmill speeds expressed as the percentage of preferred walking speed (PWS).

PWS is the speed at which a subject choose to walk on treadmill. α(1), α(2), and α(3) are exponents calculated using detrended fluctuation analysis of order 1 (DFA1), 2 (DFA2), 3 (DFA3), and madogram (MD), respectively. Data are presented as mean ± standard deviation. Scaling analysis was performed for the raw experimental time series and time series detrended using the piecewise linear variant of the MARS model. In the latter case the exponents have an L subscript. All indices that are statistically smaller than 0.5 are marked with the dagger symbol.