Locomotor adaptations to prolonged step-by-step frontal plane trunk perturbations in young adults

Walker, Eric R.; Hyngstrom, Allison S.; Onushko, Tanya; Schmit, Brian D.

doi:10.1371/journal.pone.0203776

Cited by 8 publications

(6 citation statements)

References 31 publications

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“…Discrete mediolateral perturbations produce consistent shifts in foot placement and step width in the direction of the perturbation [14][15], such as a wider step when the pelvis is perturbed toward the swing leg. However, the response to extended periods of perturbation or amplified motion appears to be more complex, with reported increases [16], decreases [17], and no change [13] in step width. Despite this interest in the link between pelvis motion and step width in various mechanical contexts, no methods currently exist to exert controlled manipulations of step width itself -as will be necessary to determine whether this gait parameter is truly under active, dynamics-dependent control.…”

Section: Introductionmentioning

confidence: 99%

Application of a novel force-field to manipulate the relationship between pelvis motion and step width in human walking

Heitkamp

Stimpson

Dean

2019

Preprint

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The motion of the pelvis is typically linked to step width during human walking. This behavior is often considered an important component of ensuring bipedal stability, but can be disrupted in populations with neurological injuries. The purpose of this study was to determine whether a novel force-field that exerts mediolateral forces on the legs can manipulate the relationship between pelvis motion and step width, providing proof-of-concept for a future clinical intervention. We designed a force-field able to: 1) minimize the delivered mediolateral forces (Transparent mode); 2) apply mediolateral forces to assist the leg toward mechanically-appropriate step widths (Assistive mode); and 3) apply mediolateral forces to perturb the leg away from mechanically-appropriate step widths (Perturbing mode). Neurologically intact participants were randomly assigned to either the Assistive group (n=12) or Perturbing group (n=12), and performed a series of walking trials in which they interfaced with the force-field. We quantified the step-by-step relationship between mediolateral pelvis displacement and step width using partial correlations. Walking in the Transparent force-field had a minimal effect on this relationship. However, force-field assistance directly strengthened the relationship between pelvis displacement and step width, whereas force-field perturbations weakened this relationship. Both assistance and perturbations were followed by short-lived effects during a wash-out period, in which the relationship between pelvis displacement and step width differed from the baseline value. The present results demonstrate that the link between pelvis motion and step width can be manipulated through mechanical means, which may be useful for retraining gait balance in clinical populations.

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Section: Introductionmentioning

confidence: 99%

Application of a novel force-field to manipulate the relationship between pelvis motion and step width in human walking

Heitkamp

Stimpson

Dean

2019

Preprint

View full text Add to dashboard Cite

show abstract

“…Discrete mediolateral perturbations produce consistent shifts in foot placement and step width in the direction of the perturbation [14], [15], such as a wider step when the pelvis is perturbed toward the swing leg. However, the response to extended periods of perturbation or amplified motion appears to be more complex, with reported increases [16], decreases [17], and no change [13] in step width. Despite this interest in the link between pelvis motion and step width in various mechanical contexts, no methods currently exist to produce controlled manipulations of step width itself -as will likely This work is licensed under a Creative Commons Attribution 4.0 License.…”

mentioning

confidence: 99%

Application of a Novel Force-Field to Manipulate the Relationship Between Pelvis Motion and Step Width in Human Walking

Heitkamp

Stimpson

Dean

2019

IEEE Trans. Neural Syst. Rehabil. Eng.

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Motion of the pelvis throughout a step predicts step width during human walking. This behavior is often considered an important component of ensuring bipedal stability, but can be disrupted in populations with neurological injuries. The purpose of this study was to determine whether a novel force-field that exerts mediolateral forces on the legs can manipulate the relationship between pelvis motion and step width, providing proof-of-concept for a future clinical intervention. We designed a force-field able to: 1) minimize the delivered mediolateral forces (Transparent mode); 2) apply mediolateral forces to assist the leg toward mechanically-appropriate step widths (Assistive mode); and 3) apply mediolateral forces to perturb the leg away from mechanically-appropriate step widths (Perturbing mode). Neurologically-intactparticipants were randomly assigned to either the Assistive group (n = 12) or Perturbing group (n = 12), and performed a series of walking trials in which they interfaced with the force-field. We quantified the step-by-step relationship between mediolateral pelvis displacement and step width using partial correlations. Walking in the Transparent force-field had a minimal effect on this relationship. However, force-field assistance directly strengthened the relationship between pelvis displacement and step width, whereas force-field perturbations weakened this relationship. Both assistance and perturbations were followed by short-lived effects during a wash-out period, in which the relationship between pelvis displacement and step width differed from the baseline value. The present results demonstrate that the link between pelvis motion and step width can be manipulated through mechanical means, which may be useful for retraining gait balance in clinical populations.

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“…As step width is known to increase in response to postural instability in the frontal plane [7,8], it is quite possible that changes in step width and foot angle are related to postural balance in participants with a certain degree of postural balance decline. adults do not need to focus on gait stability, they may prioritize efficiency to obtain propulsive force.…”

Section: Discussionmentioning

confidence: 99%

“…Step width is the lateral distance between both heels, and it is known to increase in response to lateral instability [7,8]. Foot angle is the angle formed between the long axis of the foot and the direction of body progression [9].…”

Section: Introductionmentioning

confidence: 99%

Relationship Between Frontal Plane Gait Parameters and Balance Tests in Older Adults

Miyachi¹,

Abiko²,

Nakano³

et al. 2021

Arch Phys Health Sport Med

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The gait parameters of the older adults are closely related to balance function. However, there have been no studies in which the relationship between gait parameters and frequently used balance tests, such as CoP excursion and Mini-Balance Evaluation Systems Test, were investigated with a focus on the frontal plane. Therefore, the purpose of this study is to elucidate the relationship between frontal-plane gait parameters and balance tests in older adults. Eighteen older adults who attended health classes participated in the study.Step length, step width, and foot angle were measured at a normal walking speed and maximum walking speed, using a sheet-like force plate. To assess postural balance, we measured center of pressure excursion and administered a Mini-Balance Evaluation Systems Test. As a result, no correlation between step width/foot angle and age or postural balance was observed. Moreover, step width and foot angle did not change at different walking speeds. In conclusion, step width and foot angle are not affected by postural balance in healthy older adults. Rather, step width and foot angle may be determined by gait efficiency and structural factors.

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Locomotor adaptations to prolonged step-by-step frontal plane trunk perturbations in young adults

Cited by 8 publications

References 31 publications

Application of a novel force-field to manipulate the relationship between pelvis motion and step width in human walking

Application of a novel force-field to manipulate the relationship between pelvis motion and step width in human walking

Application of a Novel Force-Field to Manipulate the Relationship Between Pelvis Motion and Step Width in Human Walking

Relationship Between Frontal Plane Gait Parameters and Balance Tests in Older Adults

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