Citation

Kitaji S, Teranishi T, Tanabe S, Ito N, Miyashita D, Oono K, Syu S, Takahashi R, Kanada Y. Jpn. J. Fall Prev. 2014; 1(1): 45-54.

Vernacular Title

歩行時模擬スリップ刺激に対する姿勢制御反応の運動学的評価 ―手提げ運搬の有無による比較―

Copyright

(Copyright © 2014, Japanese Society for Fall Prevention)

DOI

10.11335/tentouyobou.1.1_45

PMID

unavailable

Abstract

【Objective】The purpose of this study was to identify the factors that increase the risk of falling when carrying a handbag. Postural responses were compared with and without a handbag when the subjects were given a simulated slip stimulus during walking on a split-belt treadmill.【Subjects and Methods】The subjects of this study were 20 healthy adult males. The simulated slip stimulation was given to the right foot at heel contact. The three measurement conditions were left handbag, right handbag, and empty-handed walking. A three-dimensional motion analysis system was used to record the positional and temporal information of body landmarks, and the body axis and virtual center of mass were calculated from the position data.【Results】The postural response to the simulated slip stimulation was classified into two categories: "single leg support response (S-response)" and "double leg support response (DS-response)". In the S-response, the subjects stepped on the opposite foot of the stimulated lower limb. In the DS-response, the subjects stood on both legs without a step. The subjects tilted the trunk more to the posterior, and the virtual center of mass showed larger backward displacement in the S-response than in the DS-response. The subjects tilted the trunk more to the right, and the virtual center of mass showed larger rightward displacement in the DS-response than in the S-response. A larger number of DS-responses occurred when the handbag was held with the right hand. The start timing of stepping in the S-responses was delayed when the handbag was held with the right hand.【Conclusion】Slips of the foot on the handbag side at heel contact during walking are more dangerous than slips that happen on the other side, and the start timing of stepping was delayed. However, it is not possible to predict which foot will slip. Therefore, holding a handbag may increase the fall risk during walking compared to walking empty-handed.

Language: ja

Vernacular Abstract

【目的】本研究の目的は，歩行時模擬スリップ刺激に対する姿勢制御反応を荷物運搬の有無で比較分析し荷物運搬時に転倒危険性を高める要因を検討することである。【対象】対象は，健常成人男性20名であった。【方法】荷物を持たない定常歩行中と荷物運搬（左手提げかばん，右手提げかばん）歩行中の右踵接地時に模擬スリップ刺激を与え、刺激に対する姿勢制御反応を3次元動作解析装置によって運動学的に分析した。【結果】模擬スリップ刺激後の姿勢制御反応は大きく2つに分類できた。刺激側下肢のみで支持しながらステップをするSingle support反応（S反応）と，非刺激側下肢は離地せずに両下肢で支持するDouble support反応（DS反応）であった。S反応はDS反応に比べ仮想重心後方移動と体幹軸後傾が大きく，DS反応はS反応に比べ仮想重心右方移動と体幹軸右側屈が大きかった。右手提げはDS反応の出現数が定常に比べ有意に多く，S反応における非刺激側下肢のステッピング開始時間が他条件に比べ遅くなる傾向があった。【結論】手提げかばん把持側のスリップにおいて転倒に結びつきやすいDS反応が多く出現し、ステッピング開始時間が遅れていた。荷物運搬時にどちらの足でスリップが発生するかは予測できないため，手提げ運搬において転倒危険性が高まる可能性があると言える。