Mechanisms for regulating step length while running towards and over an obstacle.

Journal Article

The ability to run across uneven terrain with continuous stable movement is critical to the safety and efficiency of a runner. Successful step-to-step stabilization while running may be mediated by minor adjustments to a few key parameters (e.g., leg stiffness, step length, foot strike pattern). However, it is not known to what degree runners in relatively natural settings (e.g., trails, paved road, curbs) use the same strategies across multiple steps. This study investigates how three readily measurable running parameters - step length, foot placement, and foot strike pattern - are adjusted in response to encountering a typical urban obstacle - a sidewalk curb. Thirteen subjects were video-recorded as they ran at self-selected slow and fast paces. Runners targeted a specific distance before the curb for foot placement, and lengthened their step over the curb (p<0.0001) regardless of where the step over the curb was initiated. These strategies of adaptive locomotion disrupt step cycles temporarily, and may increase locomotor cost and muscle loading, but in the end assure dynamic stability and minimize the risk of injury over the duration of a run.

Full Text

Duke Authors

Cited Authors

  • Larsen, RJ; Jackson, WH; Schmitt, D

Published Date

  • October 2016

Published In

Volume / Issue

  • 49 /

Start / End Page

  • 186 - 195

PubMed ID

  • 27423264

Electronic International Standard Serial Number (EISSN)

  • 1872-7646

International Standard Serial Number (ISSN)

  • 0167-9457

Digital Object Identifier (DOI)

  • 10.1016/j.humov.2016.07.002

Language

  • eng