Quantitative Analysis of Balance Control on Narrow Base of Support-Balance can be Maintained even when Center of Mass Drifts Outside the Base of Support-

DOI Web Site 1 Citations 19 References
  • SAITO Hiroki
    Department of Physical Medicine, Sports Medicine Center, Medical Corporation Konseikai Funabashi Orthopedic Hospital
  • EHARA Yoshihiro
    Department of Prosthetics, Orthotics and Assistive Technologies, Faculty of Medical Technology, Niigata University of Health and Welfare
  • IWAYA Tomomichi
    Orthopedic Section, Rehabilitation Center, Society and Medical Corporation Zisenkai Aizawa Hospital
  • OSAKI Ryo
    Rehabilitation Section, Educational Corporation Saitama Medical University Hospital

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Other Title
  • 狭い支持基底面におけるバランス制御の定量的解析～基底面から重心投影点が飛び出してもバランスが保持できる制御～
  • セマイ シジ キテイメン ニ オケル バランス セイギョ ノ テイリョウテキ カイセキ キテイメン カラ ジュウシン トウエイテン ガ トビダシテモ バランス ガ ホジ デキル セイギョ
  • ∼Balance can be Maintained even when Center of Mass Drifts Outside the Base of Support∼
  • ～基底面から重心投影点が飛び出してもバランスが保持できる制御～

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Abstract

Balance control is generally analyzed by applying the Inverted Pendulum model. According to this model, humans control joint torque and hold the vertical projection of Center of Mass (COM) in the area within which Center of Pressure (COP) can move. That is to say, COM is held within the Base of support. This study analyzed tip toe movement dividing body into ankle segment and upper body segment above the ankle by applying two-dimension in sagittal plane to show that humans can maintain balance even if COM drifts outside the base of support. The results revealed that the subject could produced the large deviation of angular momentum of the body around the COM without moving the COP. This deviation increased the distance between line of action of ground reaction force and COM to maintain balance. The direction of ground reaction force was the reverse of the direction of the fall. For this reason, the subject was able to maintain the balance with the force.

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