Amplitude effects of medio-lateral mechanical and visual perturbations on gait

Kevin Terry, Emily H. Sinitski, Jonathan Dingwell, Jason M. Wilken

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Falls during walking are a major contributor to accidental deaths and injuries that can result in debilitating hospitalization costs, lost productivity, and diminished quality of life. To reduce these losses, we must develop a more profound understanding of the characteristic responses to perturbations similar to those encountered in daily life. This study addresses this issue by building on our earlier studies that examined mechanical and visual perturbations in the same environment by applying the same continuous pseudo-random perturbations at multiple (3 mechanical, 5 visual) amplitudes. Walking variability during mechanical perturbations increased significantly with amplitude for all subjects and differences as measured by variabilities of step width, COM position, and COM velocity. These parameters were the only ones sensitive to the presence of visual perturbations, but none of them changed significantly with perturbation amplitude. Additionally, visual perturbation effects were far less consistent across participants, with several who were essentially unaffected by visual perturbations at any level. The homogeneity of the mechanical perturbation effects demonstrates that human responses to mechanical perturbations are similar because they are driven by kinetics that require similar corrections that must be made in order to maintain balance. Conversely, responses to visual perturbations are driven by the perceived need to make corrections and this perception is not accurate enough to produce amplitude-related corrections, even for a single participant, nor is this perception consistent across individuals. This latter finding is likely to be relevant to future visual perturbation studies and the diagnosis and rehabilitation of gait and balance disorders.

Original languageEnglish (US)
Pages (from-to)1979-1986
Number of pages8
JournalJournal of Biomechanics
Volume45
Issue number11
DOIs
StatePublished - Jul 26 2012

Fingerprint

Gait
Patient rehabilitation
Walking
Productivity
Kinetics
Costs
Hospitalization
Rehabilitation
Quality of Life
Costs and Cost Analysis
Wounds and Injuries

All Science Journal Classification (ASJC) codes

  • Orthopedics and Sports Medicine
  • Rehabilitation
  • Biophysics
  • Biomedical Engineering

Cite this

Terry, Kevin ; Sinitski, Emily H. ; Dingwell, Jonathan ; Wilken, Jason M. / Amplitude effects of medio-lateral mechanical and visual perturbations on gait. In: Journal of Biomechanics. 2012 ; Vol. 45, No. 11. pp. 1979-1986.
@article{f14fe9b00eb341a5987e3bf99499e7f2,
title = "Amplitude effects of medio-lateral mechanical and visual perturbations on gait",
abstract = "Falls during walking are a major contributor to accidental deaths and injuries that can result in debilitating hospitalization costs, lost productivity, and diminished quality of life. To reduce these losses, we must develop a more profound understanding of the characteristic responses to perturbations similar to those encountered in daily life. This study addresses this issue by building on our earlier studies that examined mechanical and visual perturbations in the same environment by applying the same continuous pseudo-random perturbations at multiple (3 mechanical, 5 visual) amplitudes. Walking variability during mechanical perturbations increased significantly with amplitude for all subjects and differences as measured by variabilities of step width, COM position, and COM velocity. These parameters were the only ones sensitive to the presence of visual perturbations, but none of them changed significantly with perturbation amplitude. Additionally, visual perturbation effects were far less consistent across participants, with several who were essentially unaffected by visual perturbations at any level. The homogeneity of the mechanical perturbation effects demonstrates that human responses to mechanical perturbations are similar because they are driven by kinetics that require similar corrections that must be made in order to maintain balance. Conversely, responses to visual perturbations are driven by the perceived need to make corrections and this perception is not accurate enough to produce amplitude-related corrections, even for a single participant, nor is this perception consistent across individuals. This latter finding is likely to be relevant to future visual perturbation studies and the diagnosis and rehabilitation of gait and balance disorders.",
author = "Kevin Terry and Sinitski, {Emily H.} and Jonathan Dingwell and Wilken, {Jason M.}",
year = "2012",
month = "7",
day = "26",
doi = "10.1016/j.jbiomech.2012.05.006",
language = "English (US)",
volume = "45",
pages = "1979--1986",
journal = "Journal of Biomechanics",
issn = "0021-9290",
publisher = "Elsevier Limited",
number = "11",

}

Amplitude effects of medio-lateral mechanical and visual perturbations on gait. / Terry, Kevin; Sinitski, Emily H.; Dingwell, Jonathan; Wilken, Jason M.

In: Journal of Biomechanics, Vol. 45, No. 11, 26.07.2012, p. 1979-1986.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Amplitude effects of medio-lateral mechanical and visual perturbations on gait

AU - Terry, Kevin

AU - Sinitski, Emily H.

AU - Dingwell, Jonathan

AU - Wilken, Jason M.

PY - 2012/7/26

Y1 - 2012/7/26

N2 - Falls during walking are a major contributor to accidental deaths and injuries that can result in debilitating hospitalization costs, lost productivity, and diminished quality of life. To reduce these losses, we must develop a more profound understanding of the characteristic responses to perturbations similar to those encountered in daily life. This study addresses this issue by building on our earlier studies that examined mechanical and visual perturbations in the same environment by applying the same continuous pseudo-random perturbations at multiple (3 mechanical, 5 visual) amplitudes. Walking variability during mechanical perturbations increased significantly with amplitude for all subjects and differences as measured by variabilities of step width, COM position, and COM velocity. These parameters were the only ones sensitive to the presence of visual perturbations, but none of them changed significantly with perturbation amplitude. Additionally, visual perturbation effects were far less consistent across participants, with several who were essentially unaffected by visual perturbations at any level. The homogeneity of the mechanical perturbation effects demonstrates that human responses to mechanical perturbations are similar because they are driven by kinetics that require similar corrections that must be made in order to maintain balance. Conversely, responses to visual perturbations are driven by the perceived need to make corrections and this perception is not accurate enough to produce amplitude-related corrections, even for a single participant, nor is this perception consistent across individuals. This latter finding is likely to be relevant to future visual perturbation studies and the diagnosis and rehabilitation of gait and balance disorders.

AB - Falls during walking are a major contributor to accidental deaths and injuries that can result in debilitating hospitalization costs, lost productivity, and diminished quality of life. To reduce these losses, we must develop a more profound understanding of the characteristic responses to perturbations similar to those encountered in daily life. This study addresses this issue by building on our earlier studies that examined mechanical and visual perturbations in the same environment by applying the same continuous pseudo-random perturbations at multiple (3 mechanical, 5 visual) amplitudes. Walking variability during mechanical perturbations increased significantly with amplitude for all subjects and differences as measured by variabilities of step width, COM position, and COM velocity. These parameters were the only ones sensitive to the presence of visual perturbations, but none of them changed significantly with perturbation amplitude. Additionally, visual perturbation effects were far less consistent across participants, with several who were essentially unaffected by visual perturbations at any level. The homogeneity of the mechanical perturbation effects demonstrates that human responses to mechanical perturbations are similar because they are driven by kinetics that require similar corrections that must be made in order to maintain balance. Conversely, responses to visual perturbations are driven by the perceived need to make corrections and this perception is not accurate enough to produce amplitude-related corrections, even for a single participant, nor is this perception consistent across individuals. This latter finding is likely to be relevant to future visual perturbation studies and the diagnosis and rehabilitation of gait and balance disorders.

UR - http://www.scopus.com/inward/record.url?scp=84863580833&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84863580833&partnerID=8YFLogxK

U2 - 10.1016/j.jbiomech.2012.05.006

DO - 10.1016/j.jbiomech.2012.05.006

M3 - Article

VL - 45

SP - 1979

EP - 1986

JO - Journal of Biomechanics

JF - Journal of Biomechanics

SN - 0021-9290

IS - 11

ER -