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Related Experiment Video

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Computerized Dynamic Posturography for Postural Control Assessment in Patients with Intermittent Claudication
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Control of vertical posture while elevating one foot to avoid a real or virtual obstacle.

Hirofumi Ida1, Sambit Mohapatra2, Alexander Aruin3

  • 1Department of Sports and Health Management, Jobu University, Isesaki, Gunma, Japan. hiroida@me.com.

Experimental Brain Research
|March 9, 2017
PubMed
Summary

Controlling vertical posture during obstacle avoidance differs between real and virtual environments. Virtual reality (VR) settings, especially head-mounted displays (HMDs), show reduced muscle activity and altered movement patterns compared to real obstacles.

Keywords:
Foot clearanceObstacle avoidancePostural controlVirtual reality

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Virtual Reality Research

Background:

  • Vertical posture control is crucial for daily activities like obstacle avoidance.
  • Understanding postural responses in virtual reality (VR) is vital for developing effective rehabilitation strategies.

Purpose of the Study:

  • To compare vertical posture control during obstacle avoidance in real-world versus virtual reality (VR) environments.
  • To analyze the impact of different VR delivery methods (head-mounted display [HMD] and 3D projector) on postural responses.

Main Methods:

  • Ten healthy participants performed one-legged obstacle avoidance tasks.
  • Measurements included foot acceleration, center of pressure, and leg/trunk muscle electrical activity.
  • Data were analyzed across early postural adjustments (EPAs), anticipatory postural adjustments (APAs), and compensatory postural adjustments (CPAs).

Main Results:

  • Foot elevation acceleration was significantly lower in the HMD condition compared to real and 3D projector conditions.
  • Reduced leg and trunk muscle activity was observed for virtual obstacles (HMD, 3D projector) versus real obstacles, particularly during APAs and CPAs.
  • Muscle activation onsets in the supporting limb occurred during EPAs and APAs.

Conclusions:

  • Postural control strategies are modulated in VR, with distinct differences observed between real and virtual obstacle interactions.
  • Altered muscle activity and movement patterns in VR necessitate consideration for virtual rehabilitation protocol design.