Influence of gait speed on the control of mediolateral dynamic stability during gait initiation

JOURNAL OF BIOMECHANICS

卷:47

Article

Caderby, Teddy¹  Yiou, Eric²  Peyrot, Nicolas¹  Begon, Mickael³  Dalleau, Georges¹ 

[1] Univ Reunion, Lab DIMPS CURAPS, UFR Sci Homme & Environm, 117 Rue Gen Ailleret, F-97430 Le Tampon, Reunion, France

[2] Univ Paris 11, UFR STAPS, Team RIME, Lab CIAMS, F-91440 Orsay, France

[3] Univ Montreal, Dept Kinesiol, Lab Simulat & Modelisat Mouvement, Laval, PQ, Canada

关键词: Gait initiation;    Gait speed;    Anticipatory postural adjustments;    Foot placement;    Margin of stability;   

DOI  :  10.1016/j.jbiomech.2013.11.011

来源: Elsevier

【 摘 要 】

This study investigated the influence of gait speed on the control of mediolateral dynamic stability during gait initiation. Thirteen healthy young adults initiated gait at three self-selected speeds: Slow, Normal and Fast. The results indicated that the duration of anticipatory postural adjustments (APA) decreased from Slow to Fast, i.e. the time allocated to propel the centre of mass (COM) towards the stance-leg side was shortened. Likely as an attempt at compensation, the peak of the anticipatory centre of pressure (COP) shift increased. However, COP compensation was not fully efficient since the results indicated that the mediolateral COM shift towards the stance-leg side at swing foot-off decreased with gait speed. Consequently, the COM shift towards the swing-leg side at swing heel-contact increased from Slow to Fast, indicating that the mediolateral COM fall during step execution increased as gait speed rose. However, this increased COM fall was compensated by greater step width so that the margin of stability (the distance between the base-of-support boundary and the mediolateral component of the extrapolated centre of mass) at heel-contact remained unchanged across the speed conditions. Furthermore, a positive correlation between the mediolateral extrapolated COM position at heel-contact and step width was found, indicating that the greater the mediolateral COM fall, the greater the step width. Globally, these results suggest that mediolateral APA and step width are modulated with gait speed so as to maintain equivalent mediolateral dynamical stability at the time of swing heel-contact. 2013 Elsevier Ltd. All rights reserved.

【 授权许可】

Free