The effect of external lateral stabilization on ankle moment control during steady-state walking

Leeuwen, A.M. van; Dieën, Jaap H. van; Bruijn, Sjoerd M.

doi:10.1101/2022.04.29.490037

Cited by 3 publications

(1 citation statement)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition to the foot placement strategy, individuals can control their ankle moment so as to shift the center of pressure (CoP) under the foot during the stance phase. Through the displacement of the CoP, the ground reaction force (GRF) provides a more beneficial torque with respect to the CoM, compensating for "errors" in foot placement (Bruijn & Van Dieën, 2018;Hof et al, 2007;Reimann et al, 2018;van Leeuwen et al, 2021van Leeuwen et al, , 2022.…”

Section: Introductionmentioning

confidence: 99%

Differential effects of ankle constraints on foot placement control between normal and split belt treadmills

Hos

Iersel

Leeuwen

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

Mediolateral ankle moment control contributes to gait stability. Therefore, constraining ankle moment control might affect other stability mechanisms, including foot placement control. Ankle moments can be constrained by walking with a shoe with a ridge underneath the sole, narrowing the mediolateral support surface. Based on the literature, it seems that constraining ankle moment control in this fashion results in an increased step width and a decrease in the degree of foot placement control, as defined by the percentage of variance in foot placement that can be explained by CoM state. However, since that study was performed on a splitbelt treadmill and the narrow ridge could fit inside the gap between the belts, it is not evident whether these effects can be attributed to the constrained ankle moment control or to avoidance of this gap. Therefore, we investigated if the effects of ankle moment constraints are dependent on whether participants walk on a normal treadmill or a splitbelt treadmill. We included fourteen healthy young adults. Walking with constrained ankle moment control resulted in a wider step width on both treadmills. Yet, the increase in step width was larger on the splitbelt treadmill compared to on the normal treadmill. Moreover, we only found a decreased degree of foot placement control on the splitbelt, whilst the degree of foot placement control increased on the normal treadmill. We conclude that the effects of ankle moment constraints reported in our previous study were confounded by the use of a splitbelt. For future research, we recommend using a normal treadmill whenever possible, because the gap in a splitbelt treadmill might affect gait parameters.

show abstract

Section: Introductionmentioning

confidence: 99%

Differential effects of ankle constraints on foot placement control between normal and split belt treadmills

Hos

Iersel

Leeuwen

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

Differential effects of ankle constraints on foot placement control between normal and split belt treadmills

Hos¹,

Iersel²,

Leeuwen³

et al. 2022

Journal of Biomechanics

View full text Add to dashboard Cite

Force-field perturbations and muscle vibration strengthen stability-related foot placement responses during steady-state gait

van Leeuwen,

Bruijn,

Dean

2023

Preprint

Self Cite

View full text Add to dashboard Cite

Mediolateral gait stability can be maintained by coordinating our foot placement with respect to the center-of-mass (CoM) kinematic state. Neurological impairments can reduce the degree of foot placement control. For individuals with such impairments, interventions that could improve foot placement control could thus contribute to improved gait stability. In this study we aimed to better understand two potential interventions, by investigating their effect in neurologically intact individuals. The degree of foot placement control can be quantified based on a foot placement model, in which the CoM position and velocity during swing predict subsequent foot placement. Previously, perturbing foot placement with a force-field resulted in an enhanced degree of foot placement control as an after-effect. Moreover, muscle vibration enhanced the degree of foot placement control through sensory augmentation whilst the vibration was applied. Here, we replicated these two findings and further investigated whether Q1) sensory augmentation leads to an after-effect and Q2) whether combining sensory augmentation with force-field perturbations leads to a larger after-effect, as compared to force- field perturbations only. In addition, we evaluated several potential contributors to the degree of foot placement control, by considering foot placement errors, CoM variability and the CoM position gain (βpos) of the foot placement model, next to the R2 measure as the degree of foot placement control. Sensory augmentation led to a higher degree of foot placement control as an after-effect (Q1). However, combining sensory augmentation and force-field perturbations did not lead to a larger after-effect, as compared to following force-field perturbations only (Q2). Furthermore, we showed that, the improved degree of foot placement control following force- field perturbations and during/following muscle vibration, did not reflect diminished foot placement errors. Rather, participants demonstrated a stronger active response (higher βpos) as well as higher CoM variability.

show abstract

The effect of external lateral stabilization on ankle moment control during steady-state walking

Cited by 3 publications

References 32 publications

Differential effects of ankle constraints on foot placement control between normal and split belt treadmills

Differential effects of ankle constraints on foot placement control between normal and split belt treadmills

Differential effects of ankle constraints on foot placement control between normal and split belt treadmills

Force-field perturbations and muscle vibration strengthen stability-related foot placement responses during steady-state gait

Contact Info

Product

Resources

About