Gait & Posture
Volume 3, Issue 4 , Pages 221-226, December 1995

Dynamic properties of body oscillation with visual tracking movement on upright posture

  • Y Oida

      Affiliations

    • Corresponding Author InformationCorrespondence and reprint requests to: Yukio Oida, Meiji Health and Physical Fitness Research Institute, Tobuki 150, Hachiouji, Tokyo 192, Japan
    • Meiji Health and Physical Fitness Research Institute, Hachiouji, Tokyo, Japan
    • ,
  • S Watanabe

      Affiliations

    • Department of Equilibrium Adaptation Research, Division of Higher Nervous Control, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan
    • ,
  • A Takabayashi

      Affiliations

    • School of Health Sciences, Fujita Health University, Toyoake, Japan

Received 28 June 1994; accepted 12 February 1995.

Abstract 

The purpose of this study was to determine the characteristic frequency range of body oscillation in the anterior and posterior directions during upright standing. The 24 subjects were asked to track the motion of a target with sinusoidal waveform in the frequency range of 0.05 to 1.5 Hz, by displacing their body centre of pressure (COP). The gain of the COP responses to the target showed a broad peak in the stimulus frequency range between 0.3 and 0.6 Hz. The peak accelerations of the body parts were greatest at 0.6 Hz. The resonance frequency for motion around the ankle joint was at 0.6 Hz. The resonance frequency is suggested to reflect mostly the spontaneous body sway and to be involved in the control mechanism of standing posture. In the control system of tracking movement we speculate that there are three separate systems each corresponding to one of the three frequency bands of 0.05-0.2 Hz (position control system), 0.4-0.8 Hz (optimal resonant control system), and 1.0–1.5 Hz (non-linear bang-bang control system). The locus of postural control is transferred from the ankle to the hip joint in the frequency range of 1.0–1.5 Hz.

Keywords:  Upright posture, body sway, dynamics, tracking movement

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PII: 0966-6362(96)82851-7

Gait & Posture
Volume 3, Issue 4 , Pages 221-226, December 1995

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