歩行中の段差の昇段に利用される方略と知覚される身体特性

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In stepping onto various heights of an obstacle such as a step during walking may generally be performed with two types of strategies by the trajectory of toe: double peak strategy (hereinafter referred to as "walking strategy") and single peak strategy (hereinafter referred to as "stepping onto strategy"). The former is like walking, such that the trajectory of the toe initially rises up, then swings downward, and again rises up, resulting in safely stepping onto the obstacle step. The latter is just a strategy such that the toe is raised up steadily and safely stepping onto the obstacle step. The present study examined the boundary in step height (i.e., the critical step height) for switching between the two strategies, from the walking to the stepping-onto strategy, and then examined the relationships between the boundary in step height and the body size, such as body height, leg length and lower leg length. Participants were assigned to either the short or tall body height groups. Both groups performed level walking, then stepping onto the obstacle step, which was manipulated in step height for every 1cm from 1 to 9cm height. Our results showed that as the step height became high, the use of the stepping-onto strategy increased more than the use of the walking strategy. The boundary in step height for switching from the walking to the stepping-onto strategy was higher for the tall group than for the short group. In contrast, the ratio π, calculated by dividing the critical step height with the lower leg length, was quite similar (approximately 4%) for both the tall and short groups. This suggested that the participants may probably use information about both the step height and the lower leg length at a time when switching their strategies for safely stepping onto an obstacle step during walking.
日本体力医学会の論文
2008-02-01

歩行中の段差の昇段に利用される方略と知覚される身体特性

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