Changes in relative work of the lower extremity joints and distal foot with walking speed

JOURNAL OF BIOMECHANICS

卷:58

Article

Ebrahimi, Anahid¹  Goldberg, Saryn R.²  Stanhope, Steven J.^1,3,4,5 

[1] Univ Delaware, Dept Mech Engn, Newark, DE 19716 USA

[2] Hofstra Univ, Dept Engn, Hempstead, NY 11550 USA

[3] Univ Delaware, Biomech & Movement Sci Interdisciplinary Program, Newark, DE USA

[4] Univ Delaware, Dept Kinesiol & Appl Physiol, Newark, DE USA

[5] Univ Delaware, Dept Biomed Engn, Newark, DE USA

关键词: Gait analysis;    Constituent work;    Joint work;    Distal foot;    6 DOF power;   

DOI  :  10.1016/j.jbiomech.2017.04.012

来源: Elsevier

【 摘 要 】

The modulation of walking speed results in adaptations to the lower limbs which can be quantified using mechanical work. A 6 degree-of-freedom (DOF) power analysis, which includes additional translations as compared to the 3 DOF (all rotational) approach, is a comprehensive approach for quantifying lower limb work during gait. The purpose of this study was to quantify the speed-related 6 DOF joint and distal foot work adaptations of all the lower extremity limb constituents (hip, knee, ankle, and distal foot) in healthy individuals. Relative constituent 6 DOF work, the amount of constituent work relative to absolute limb work, was calculated during the stance and swing phases of gait. Eight unimpaired adults walked on an instrumented split-belt treadmill at slow, moderate, and typical walking speeds (0.4, 0.6, and 0.8 statures/s, respectively). Using motion capture and force data, 6 DOF powers were calculated for each constituent. Contrary to previously published results, 6 DOF positive relative ankle work and negative relative distal foot work increased significantly with increased speed during stance phase (p < 0.05). Similar to previous rotational DOF results in the sagittal plane, negative relative ankle work decreased significantly with increased speed during stance phase (p < 0.05). Scientifically, these findings provide new insight into how healthy individuals adapt to increased walking speed and suggest limitations of the rotational DOF approach for quantifying limb work. Clinically, the data presented here for unimpaired limbs can be used to compare with speed-matched data from limbs with impairments. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free