title: Effect of intermittent feedback control on robustness of human-like postural control system.
abstract: Humans have to acquire postural robustness to maintain stability against internal and external perturbations. Human standing has been recently modelled using an intermittent feedback control. However, the causality inside of the closed-loop postural control system associated with the neural control strategy is still unknown. Here, we examined the effect of intermittent feedback control on postural robustness and of changes in active/passive components on joint coordinative structure. We implemented computer simulation of a quadruple inverted pendulum that is mechanically close to human tiptoe standing. We simulated three pairs of joint viscoelasticity and three choices of neural control strategies for each joint: intermittent, continuous, or passive control. We examined postural robustness for each parameter set by analysing the region of active feedback gain. We found intermittent control at the hip joint was necessary for model stabilisation and model parameters affected the robustness of the pendulum. Joint sways of the pendulum model were partially smaller than or similar to those of experimental data. In conclusion, intermittent feedback control was necessary for the stabilisation of the quadruple inverted pendulum. Also, postural robustness of human-like multi-link standing would be achieved by both passive joint viscoelasticity and neural joint control strategies.
authors.affiliation: The Japan Society for the Promotion of Science, Kojimachi Business Center, 5-3-1, Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan.|Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu, Sakyo-ku, Kyoto 606-8501, Japan.
authors.forename: Hiroko
authors.initials: H
authors.lastname: Tanabe
authors.affiliation: The Japan Society for the Promotion of Science, Kojimachi Business Center, 5-3-1, Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan.|Research Center of Health Physical Fitness and Sports, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Fujii
authors.affiliation: Division of Bioengineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama-cho, Toyonaka, Osaka 560-8541, Japan.
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Suzuki
authors.affiliation: Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu, Sakyo-ku, Kyoto 606-8501, Japan.
authors.forename: Motoki
authors.initials: M
authors.lastname: Kouzaki
mesh_terms: D000886:Anthropometry; D001696:Biomechanical Phenomena; D003198:Computer Simulation; D005246:Feedback; D005260:Female; D006801:Humans; D007596:Joints / Q000502:physiology; D008954:Models, Biological; D011187:Posture / Q000502:physiology*; D055815:Young Adult