NDLI: Non-actively controlled double-inverted-pendulum-like dynamics can minimize center of mass acceleration during human quiet standing

Content Provider	IEEE Xplore Digital Library
Author	Suzuki, Y. Morimoto, H. Kiyono, K. Morasso, P. Nomura, T.
Copyright Year	2015
Description	Author affiliation: Grad. Sch. of Eng. Sci., Osaka Univ., Toyonaka, Japan (Suzuki, Y.; Morimoto, H.; Kiyono, K.; Nomura, T.) \|\| RBCS Dept., Italian Inst. of Technol., Genoa, Italy (Morasso, P.)
Abstract	Multiple joint movements during human quiet standing exhibit characteristic inter-joint coordination, shortly referred to as reciprocal relationship, in which angular acceleration of the hip joint is linearly and negatively correlated with that of the ankle joint (antiphase coordination) and, moreover, acceleration of the center of mass (CoM) of the double-inverted-pendulum (DIP) model of the human body is close to zero constantly. A question considered in this study is whether the reciprocal relationship is established by active neural control of the posture, or rather it is a biomechanical consequence of non-actively controlled body dynamics. To answer this question, we consider a DIP model of quiet standing, and show that the reciprocal relationship always holds by Newton's second law applied to the DIP model with human anthropometric dimensions, regardless of passive and active joint torque patterns acting on the ankle and hip joints. We then show that characteristic frequencies included in experimental sway trajectories with the reciprocal relationship match with harmonics of the eigenfrequency of the stable antiphase eigenmode of the non-actively controlled DIP-like unstable body dynamics. The results suggest that non-actively controlled DIP-like mechanical dynamics is a major cause of the minimization of the CoM acceleration during quiet standing, which is consistent with a type of control strategy that allows switching off active neural control intermittently for suitable periods of time during quiet standing.
Starting Page	1432
Ending Page	1435
File Size	1627208
Page Count	4
File Format	PDF
ISSN	1557170X
e-ISBN	9781424492718
DOI	10.1109/EMBC.2015.7318638
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-08-25
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Joints Acceleration Hip Trajectory Electronics packaging Mathematical model Angular velocity
Content Type	Text
Resource Type	Article
Subject	Signal Processing Biomedical Engineering Health Informatics Computer Vision and Pattern Recognition

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