한국체육학회지자연과학편

Korean Alliance for Health: Physical Education: Recreation:and Dance (한국체육학회)
권호 표지

Nonlinear time series analysis of dynamic stability during human walking at the preferred speed

비선형 시계열 분석 기법에 의한 선호속도 걷기의 동적 안정성 비교 분석

Ryu, Ji-Seon
류지선

  • Published : 2007.03.31
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Abstract

The purpose of this study was to determine the local dynamic stability during walking. Six subjects (mean height: 180.1±5.9cm, mean body mass: 76.1±8.8kg, mean age: 30.1±0.2) who had no history of injury in the extremities participated and were asked to walk at their preferred walking speed (mean speed 4.0±0.7km/hr.), 20 percent less than preferred walking speed (mean speed 3.2±0.5km/hr.) and 20 percent greater(mean speed 4.7±0.8km/hr.). Three-dimensional Coordinates of the markers attached on the hip, knee, ankle joint were collected from 100 strides during continuous treadmill walking at three walking conditions. Lyapunov exponents(LyE) were computed for nonlinear time series of the knee's vertical displacement and its joint angle in sagittal plane on these walking speed conditions to quantify the local dynamic stability. Lyapunov exponent of the knee displacement was not predicted by difference in walking speed, but most subjects showed that Lyapunov exponents from the knee joint angle exhibited the lowest in the preferred walking speed. These results supported the fact that it was the most stability to walk at preferred walking speed compared with non-preferred walking speed.

Keywords

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