Dynamic stability of human walking during perturbed conditions

Author ORCID Identifier

https://orcid.org/0000-0002-4210-2131

Advisor Information

Jenna Yentes

Location

MBSC 201

Presentation Type

Poster

Start Date

6-3-2020 9:00 AM

End Date

6-3-2020 10:15 AM

Abstract

Imposing a perturbation can induce an unstable condition during gait. Measuring the compensatory responses may be an accurate indicator of the ability to control stability. Responses to a perturbation can be quantified through the perturbed walking pattern deviations from an unperturbed condition, and the rate of return towards the unperturbed walking pattern. This study aims to determine the effect of perturbation magnitude or speed of walking on compensatory responses to medial and lateral perturbations during walking. Fifteen healthy young participants will be perturbed with the medium magnitude of perturbation (5 cm, 0.98 m/s, 0.88 m/s2), while walking on the treadmill at three different speeds (slow, preferred, and fast). They also will walk on the treadmill at their preferred speed while perturbed with three different magnitudes of perturbation (small, medium, large). All perturbations will be delivered as a platform translation toward the walker’s left side at right heel contact (medial) and toward the walker’s left side at left heel contact (lateral). The impulse to the participant is analyzed using the integral of the ground reaction force result vector. The response to the perturbation can be divided into two compensatory phases: 1) (resistance) and 2) recovery phase. It is expected that Increasing walking speed will improve resistance to the perturbation while decreasing the performance in the recovery phase of the compensatory response. Increasing perturbation magnitudes is assumed to negatively affect recovery compensatory responses while resistance to the perturbation will remain unchanged.

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COinS
 
Mar 6th, 9:00 AM Mar 6th, 10:15 AM

Dynamic stability of human walking during perturbed conditions

MBSC 201

Imposing a perturbation can induce an unstable condition during gait. Measuring the compensatory responses may be an accurate indicator of the ability to control stability. Responses to a perturbation can be quantified through the perturbed walking pattern deviations from an unperturbed condition, and the rate of return towards the unperturbed walking pattern. This study aims to determine the effect of perturbation magnitude or speed of walking on compensatory responses to medial and lateral perturbations during walking. Fifteen healthy young participants will be perturbed with the medium magnitude of perturbation (5 cm, 0.98 m/s, 0.88 m/s2), while walking on the treadmill at three different speeds (slow, preferred, and fast). They also will walk on the treadmill at their preferred speed while perturbed with three different magnitudes of perturbation (small, medium, large). All perturbations will be delivered as a platform translation toward the walker’s left side at right heel contact (medial) and toward the walker’s left side at left heel contact (lateral). The impulse to the participant is analyzed using the integral of the ground reaction force result vector. The response to the perturbation can be divided into two compensatory phases: 1) (resistance) and 2) recovery phase. It is expected that Increasing walking speed will improve resistance to the perturbation while decreasing the performance in the recovery phase of the compensatory response. Increasing perturbation magnitudes is assumed to negatively affect recovery compensatory responses while resistance to the perturbation will remain unchanged.