Korean Journal of Applied Biomechanics (한국운동역학회지)

Korean Society of Applied Biomechanics (한국운동역학회)
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Complexity Comparison of Center of Pressure between Fallers and Non-fallers during Gait

보행 시 낙상 유무에 따른 압력중심점의 복잡성 비교

  • Park, Sang Kyoon (Department of Physical Education, College of Sport Science of Korea National Sport University) ;
  • Ryu, Sihyun (Motion Innovation Centre, Korea National Sport University) ;
  • Kim, Jongbin (Motion Innovation Centre, Korea National Sport University) ;
  • Yoon, Sukhoon (Department of Community Sport, Korea National Sport University) ;
  • Ryu, Jiseon (Department of Health and Exercise Science, College of Lifetime Sport of Korea National Sport University)
  • Received : 2019.04.29
  • Accepted : 2019.05.07
  • Published : 2019.06.30
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Abstract

Objective: The purpose of this study was to investigate the effect of the falls on the center of pressure (CoP) complexity during gait using non-linear approximate entropy (ApEn). Method: 20 elderly women with experience of falling ($age=72.55{\pm}5.42yrs$; $height=154.40{\pm}4.26cm$; $body\;weight=57.40{\pm}6.21kg$; $preferred\;gait\;speed=0.52{\pm}0.17m/s$) and 20 elderly women with no experience of falling ($age=71.90{\pm}2.90yrs$; $height=155.28{\pm}4.73cm$; $body\;weight=56.70{\pm}5.241kg$; $preferred\;gait\;speed=0.56{\pm}0.13m/s$) were recruited for the study. While they were walking at their preferred gait speed on a treadmill (instrumented dual belt treadmills, Bertec, USA) with a force plate CoP data were collected for the 20 strides. The complexity of the CoP was analyzed using the ApEn technique. Results: The ApEn of the medial-lateral CoP in the fallers showed smaller about 16% compared to the non-fallers (p<.05). The ApEn of the antero-posterior CoP of the fallers showed smaller about 12% compared to the non-fallers, but the difference was not statistically significant. Conclusion: Based on the results of this study, the reduction of the medio-lateral CoP complexity in the elderly gait would be an index to determine the potential fall.

Keywords

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Figure 1. Example of CoP and their surrogate data for an individual of the fall group.

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Figure 2. Original CoP and their surrogate data between fallers and non-fallers.

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Figure 3. ApEn values of CoP between fall and non-fall groups.

Table 1. ApEn in original CoP and their surrogate data and statistic results between fallers and non-fallers

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Table 2. ApEn values of CoP between fall and non-fall groups and their statistic test results

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