Foot lengthening and shortening during gait: A parameter to investigate foot function?
Stolwijk, N. M., Koenraadt, K. L. M., Louwerens, J. W. K., Grim, D., Duysens, J., & Keijsers, N. L. W. (2014).
Gait & Posture, 39(2), 773–777.
https://gyazo.com/330aa551d52cd4148b9a057b6d2d3643
Highlights
Foot length and medial arch (MLA) angle during stance phase at 3 speed conditions were investigated.
The foot lengthens during weight bearing and shortens during propulsion.
At higher walking speeds there is less change in foot length and MLA angle compared to slower speeds.
The foot length and MLA curve were similar except between 50% and 80% of stance.
Foot length represents Hicks mechanism in the foot and is easy to implement in gait analysis.
abst
Based on the windlass mechanism theory of Hicks, the medial longitudinal arch (MLA) flattens during weight bearing. Simultaneously, foot lengthening is expected. However, changes in foot length during gait and the influence of walking speed has not been investigated yet. The foot length and MLA angle of 34 healthy subjects (18 males, 16 females) at 3 velocities (preferred, low (preferred -0.4m/s) and fast (preferred +0.4m/s) speed were investigated with a 3D motion analysis system (VICON(®)). The MLA angle was calculated as the angle between the second metatarsal head, the navicular tuberculum and the heel in the local sagittal plane. Foot length was calculated as the distance between the marker at the heel and the 2nd metatarsal head. A General Linear Model for repeated measures was used to indicate significant differences in MLA angle and foot length between different walking speeds. The foot lengthened during the weight acceptance phase of gait and shortened during propulsion. With increased walking speed, the foot elongated less after heel strike and shortened more during push off. The MLA angle and foot length curve were similar, except between 50% and 80% of the stance phase in which the MLA increases whereas the foot length showed a slight decrease. Foot length seems to represent the Hicks mechanism in the foot and the ability of the foot to bear weight. At higher speeds, the foot becomes relatively stiffer, presumably to act as a lever arm to provide extra propulsion. ヒックスのウインドラス機構理論に基づいて、体重負荷時に内側縦アーチ（MLA）が平らになります。同時に、足の延長が期待されます。ただし、歩行中の足の長さの変化と歩行速度の影響はまだ調査されていません。 3つの速度（優先、低速（優先-0.4m / s）および高速（優先+ 0.4m / s）での健康な被験者34人（男性18人、女性16人）の足の長さとMLA角度を3Dモーション分析で調査しましたシステム（VICON（®））。MLA角度は、局所矢状面における第2中足骨頭、舟状結核およびheの間の角度として計算された。足の長さは、elと2番目のマーカーの間の距離として計算された中足骨頭反復測定の一般線形モデルを使用して、異なる歩行速度間でのMLA角度と足長の有意差を示しました。歩行の重量受容段階で足が長くなり、推進中に短くなりました。 MLAの角度と足の長さの曲線は、MLAが増加する一方、足の長さがわずかに減少したスタンスフェーズの50％〜80％を除き、同様でした。簡易。足の長さは、足のヒックスのメカニズムと、足が体重を支える能力を表しているようです。より高い速度では、足が比較的硬くなり、おそらく余分な推進力を提供するレバーアームとして機能します。 Keywords: