Stability-maneuverability trade-offs during lateral steps

Julian Acasio, Mengnan Mary Wu, Nicholas P. Fey, Keith E. Gordon

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Selecting a specific foot placement strategy to perform walking maneuvers requires the management of several competing factors, including: maintaining stability, positioning oneself to actively generate impulses, and minimizing mechanical energy requirements. These requirements are unlikely to be independent. Our purpose was to determine the impact of lateral foot placement on stability, maneuverability, and energetics during walking maneuvers. Ten able-bodied adults performed laterally-directed walking maneuvers. Mediolateral placement of the “Push-off” foot during the maneuvers was varied, ranging from a cross-over step to a side-step. We hypothesized that as mediolateral foot placement became wider, passive stability in the direction of the maneuver, the lateral impulse generated to create the maneuver, and mechanical energy cost would all increase. We also hypothesized that subjects would prefer an intermediate step width reflective of trade-offs between stability vs. both maneuverability and energy. In support of our first hypothesis, we found that as Push-off step width increased, lateral margin of stability, peak lateral impulse, and total joint work all increased. In support of our second hypothesis, we found that when subjects had no restrictions on their mediolateral foot placement, they chose a foot placement between the two extreme positions. We found a significant relationship (p < 0.05) between lateral margin of stability and peak lateral impulse (r = 0.773), indicating a trade-off between passive stability and the force input required to maneuver. These findings suggest that during anticipated maneuvers people select foot placement strategies that balance competing costs to maintain stability, actively generate impulses, and minimize mechanical energy costs.

Original languageEnglish (US)
Pages (from-to)171-177
Number of pages7
JournalGait and Posture
Volume52
DOIs
StatePublished - Feb 1 2017

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Foot
Walking
Costs and Cost Analysis

Keywords

  • Energy
  • Gait
  • Maneuver
  • Margin of stability
  • Work

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Rehabilitation

Cite this

Stability-maneuverability trade-offs during lateral steps. / Acasio, Julian; Wu, Mengnan Mary; Fey, Nicholas P.; Gordon, Keith E.

In: Gait and Posture, Vol. 52, 01.02.2017, p. 171-177.

Research output: Contribution to journalArticle

Acasio, Julian ; Wu, Mengnan Mary ; Fey, Nicholas P. ; Gordon, Keith E. / Stability-maneuverability trade-offs during lateral steps. In: Gait and Posture. 2017 ; Vol. 52. pp. 171-177.
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