TY - GEN
T1 - Quantifying chaotic behavior in treadmill walking
AU - Josiński, Henryk
AU - Michalczuk, Agnieszka
AU - Świtoński, Adam
AU - Mucha, Romualda
AU - Wojciechowski, Konrad
N1 - Publisher Copyright:
© Springer International Publishing Switzerland 2015.
PY - 2015
Y1 - 2015
N2 - The authors describe an example of application of nonlinear time series analysis directed at identifying the presence of deterministic chaos in human motion data by means of the largest Lyapunov exponent (LLE). The research aimed at determination of the influence of gait speed on the LLE value with a view to verification of the belief that slower walking leads to increased stability characterized by smaller LLE value. Analyses were focused on the time series representing hip flexion/extension angle, knee flexion/extension angle and dorsiflexion/plantarflexion dimension of the ankle. Gait sequences were recorded in the Human Motion Laboratory (HML) of the Polish- Japanese Academy of Information Technology in Bytom by means of the Vicon system. Application of the AC5000M treadmill allowed recordings in three variants: at the preferred walking speed (PWS) of each subject, at 80% of the PWS and at 120% of the PWS. According to the recommendations from the literature the LLE value was estimated twice for every time series: as the short-term LLE1 for the first stride and as the long-term LLE4−10 over a fixed interval between the fourth and the tenth stride. In the latter case it was confirmed that the LLE value increases with walking speed for both limbs.
AB - The authors describe an example of application of nonlinear time series analysis directed at identifying the presence of deterministic chaos in human motion data by means of the largest Lyapunov exponent (LLE). The research aimed at determination of the influence of gait speed on the LLE value with a view to verification of the belief that slower walking leads to increased stability characterized by smaller LLE value. Analyses were focused on the time series representing hip flexion/extension angle, knee flexion/extension angle and dorsiflexion/plantarflexion dimension of the ankle. Gait sequences were recorded in the Human Motion Laboratory (HML) of the Polish- Japanese Academy of Information Technology in Bytom by means of the Vicon system. Application of the AC5000M treadmill allowed recordings in three variants: at the preferred walking speed (PWS) of each subject, at 80% of the PWS and at 120% of the PWS. According to the recommendations from the literature the LLE value was estimated twice for every time series: as the short-term LLE1 for the first stride and as the long-term LLE4−10 over a fixed interval between the fourth and the tenth stride. In the latter case it was confirmed that the LLE value increases with walking speed for both limbs.
KW - Deterministic chaos
KW - Human motion analysis
KW - Nonlinear time series analysis
KW - Phase space reconstruction
UR - https://www.scopus.com/pages/publications/84925237404
U2 - 10.1007/978-3-319-15705-4_31
DO - 10.1007/978-3-319-15705-4_31
M3 - Conference contribution
AN - SCOPUS:84925237404
T3 - Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
SP - 317
EP - 326
BT - Intelligent Information and Database Systems - 7th Asian Conference, ACIIDS 2015, Proceedings
A2 - Nguyen, Ngoc Thanh
A2 - Trawiński, Bogdan
A2 - Nguyen, Ngoc Thanh
A2 - Kosala, Raymond
PB - Springer Verlag
T2 - 7th Asian Conference on Intelligent Information and Database Systems, ACIIDS 2015
Y2 - 23 March 2015 through 25 March 2015
ER -