Gait alterations on irregular surface in people with Parkinson's disease

Xu, Hang; Hunt, MaryEllen; Foreman, K. Bo; Zhao, Jie

doi:10.1016/j.clinbiomech.2018.06.013

Cited by 32 publications

(22 citation statements)

References 33 publications

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“…In addition, within the environment, parents reported uneven surfaces and inadequate space as additional environmental rate limiters. Similar to falling, the impact of uneven surfaces has been reported to impact walking in adults with Parkinson’s disease (Xu et al, 2018) and older adults (Brookfield et al, 2017). Furthermore, due to the acute health complications with CHARGE syndrome, the effect of hospitalizations or surgeries was reported by parents to cause a delay on the development of walking due to the restrictive environment.…”

Section: Discussionmentioning

confidence: 99%

Parents’ Perceptions of Constraints Impacting the Development of Walking in Children with CHARGE Syndrome

Foster

Silliman-French

Grenier

2020

Research and Practice for Persons with Severe Disabilities

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This study examined parents’ perceptions of constraints that impact the attainment of independent walking in children with CHARGE syndrome. This syndrome is a multifaceted syndrome including a degree of vision and hearing loss at birth. The Dynamic Systems Theory (DST) was used as an ecological lens to provide insight into the complexity of issues impacting independent walking from the parents’ perceptions. Semi-structured interviews were administrated to 23 parents of children with CHARGE syndrome to ascertain the degree to which individual, environmental, or task constraints impacted their child’s development of independent walking. Data analysis was conducted through direct content analysis based on the DST. Parents reported that the task of walking was impacted by individual constraints, both structural and functional, and environmental constraints, such as space, surface area, and the use of furniture. Recommended interventions for professionals who work with children who are deafblind include manipulation and adaptation of environmental and task constraints.

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Section: Discussionmentioning

confidence: 99%

Parents’ Perceptions of Constraints Impacting the Development of Walking in Children with CHARGE Syndrome

Foster

Silliman-French

Grenier

2020

Research and Practice for Persons with Severe Disabilities

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“…Surprisingly, the dependence of speed on stride frequency over stride length was retained for walking on uneven ground in ants. When confronted with uneven terrain, humans generally reduce step lengths [55,56], particularly in older adults or in individuals with compromised gaits who must compensate for reduced balance [57,58]. Although ants slowed down on uneven substrates, these speed reductions were primarily modulated by changes in stride frequency.…”

Section: Ant Limb Kinematicsmentioning

confidence: 99%

Uneven substrates constrain walking speed in ants through modulation of stride frequency more than stride length

2020

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Natural terrain is rarely flat. Substrate irregularities challenge walking animals to maintain stability, yet we lack quantitative assessments of walking performance and limb kinematics on naturally uneven ground. We measured how continually uneven 3D-printed substrates influence walking performance of Argentine ants by measuring walking speeds of workers from laboratory colonies and by testing colony-wide substrate preference in field experiments. Tracking limb motion in over 8000 videos, we used statistical models that associate walking speed with limb kinematic parameters to compare movement over flat versus uneven ground of controlled dimensions. We found that uneven substrates reduced preferred and peak walking speeds by up to 42% and that ants actively avoided uneven terrain in the field. Observed speed reductions were modulated primarily by shifts in stride frequency instead of stride length (flat R 2 : 0.91 versus 0.50), a pattern consistent across flat and uneven substrates. Mixed effect modelling revealed that walking speeds on uneven substrates were accurately predicted based on flat walking data for over 89% of strides. Those strides that were not well modelled primarily involved limb perturbations, including missteps, active foot repositioning and slipping. Together these findings relate kinematic mechanisms underlying walking performance on uneven terrain to ecologically relevant measures under field conditions.

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“…Surprisingly, the dependence of speed on stride frequency and not stride length was retained for walking on uneven ground in ants. When confronted with uneven terrain, humans generally reduce step lengths [38,39], particularly in older adults or in individuals with compromised gaits who must compensate for reduced balance [40,41]. Although ants slowed down on rough substrates, these speed reductions were primarily modulated by changes in stride frequency.…”

Section: Ant Limb Kinematicsmentioning

confidence: 99%

Rough substrates constrain walking speed in ants through modulation of stride frequency and not stride length

Clifton¹,

Holway²,

Gravish³

2019

Preprint

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Natural terrain is rarely flat. Substrate irregularities challenge walking animals to maintain stability, yet we lack quantitative assessments of walking performance and limb kinematics on naturally rough ground. We measured how continually rough 3D-printed substrates influence walking performance of Argentine ants by measuring walking speeds of workers from lab colonies and by testing colony-wide substrate preference in field experiments. Tracking limb motion in over 8,000 videos, we used statistical models that associate walking speed with limb kinematic parameters to compare movement over flat versus rough ground. We found that rough substrates reduced preferred and peak walking speeds by up to 42% and that ants actively avoided rough terrain in the field. Observed speed reductions were modulated primarily by shifts in stride frequency and not stride length, a pattern consistent across flat and rough substrates. Modeling revealed that walking speeds on rough substrates were accurately predicted based on flat walking data for over 89% of strides. Those strides that were not well modeled primarily involved limb perturbations, including missteps, active foot repositioning, and slipping. Together these findings relate kinematic mechanisms underlying walking performance on rough terrain to ecologically-relevant measures under field conditions.

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Gait alterations on irregular surface in people with Parkinson's disease

Cited by 32 publications

References 33 publications

Parents’ Perceptions of Constraints Impacting the Development of Walking in Children with CHARGE Syndrome

Parents’ Perceptions of Constraints Impacting the Development of Walking in Children with CHARGE Syndrome

Uneven substrates constrain walking speed in ants through modulation of stride frequency more than stride length

Rough substrates constrain walking speed in ants through modulation of stride frequency and not stride length

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