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Strategies of Collision Avoidance with Moving and Stationary Human Obstacles during Walking

보행 시 인간 장애물의 동적·정적 상태에 따른 충돌회피전략

  • Lee, Yeon-Jong (Department of Sport and Leisure, Semyung University) ;
  • Kim, Joo-Nyeon (Department of Sport and Leisure, Semyung University)
  • Received : 2019.01.25
  • Accepted : 2019.05.03
  • Published : 2019.06.30

Abstract

Objective: The aim of this study was to investigate the strategies for avoiding moving and stationary walker using body segments during walking. Method: Ten healthy young adults (10 males, age: $24.40{\pm}0.49yrs$, height: $175.80{\pm}5.22cm$, body mass: $70.30{\pm}5.22kg$) participated in this study. Each participant was asked to perform a task to avoid collisions with another walker who was moving or stationary during walking on the 10 m walkway. Both walkers were performed at natural self-selected walking speed. Results: Medio-lateral avoidance displacement of the trunk and the pelvis were significantly increased when avoiding a stationary walker (p<.05). There were no significant differences in medio-lateral center of mass trajectory. Rotation angle of trunk, pelvis and foot on the vertical axis were significantly increased when avoiding a stationary walker (p<.05). Conclusion: Based on our results, when another walker moves continuously, the walker recognizes another walker as the object of social interaction and performs the avoidance strategies while expecting the cooperative distance. On the other hand, when another walker is stopped, it is determined that the walker has an obligation to avoid, and the walker performs a relatively safer avoidance strategy.

Keywords

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Figure 1. Walking path (blue-line) and whole-body movement (skeletal figure) between obstacle avoidance (A) and obstacle circumvention (B)

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Figure 2. Definitions of medio-lateral avoidance displacements, medio-lateral COM trajectories and rotation angles on vertical axis of trunk, pelvis and foot

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Figure 3. Mean ± standard deviation of the medio-lateral avoidance displacement (A), the medio-lateral COM trajectory (B), and the rotation angle on the vertical axis of trunk, pelvis and foot (C) during walking and avoiding from moving or stationary walker. The * symbol indicates a significant difference between avoidance strategies from moving and stationary walker.

Table 1. Summary information for the participants

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Table 2. Mean ± standard deviations of the avoidance strategies and the paired t-test results

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