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Gait parameter adjustments for walking on a treadmill at preferred, slower, and faster speeds in older adults with down syndrome.

Smith BA, Kubo M, Ulrich BD - Curr Gerontol Geriatr Res (2012)

Bottom Line: The combined effects of ligamentous laxity, hypotonia, and decrements associated with aging lead to stability-enhancing foot placement adaptations during routine overground walking at a younger age in adults with Down syndrome (DS) compared to their peers with typical development (TD).All adults adapted their gait patterns similarly in response to faster and slower than preferred treadmill-walking speeds.Older adults with DS, however, adjusted their stride frequencies significantly less than their peers with TD.

View Article: PubMed Central - PubMed

Affiliation: Balance Disorders Laboratory, Departments of Neurology and Behavioral Neuroscience, Oregon Health and Science University, 505 NW 185th Avenue, Beaverton, OR 97006, USA.

ABSTRACT
The combined effects of ligamentous laxity, hypotonia, and decrements associated with aging lead to stability-enhancing foot placement adaptations during routine overground walking at a younger age in adults with Down syndrome (DS) compared to their peers with typical development (TD). Our purpose here was to examine real-time adaptations in older adults with DS by testing their responses to walking on a treadmill at their preferred speed and at speeds slower and faster than preferred. We found that older adults with DS were able to adapt their gait to slower and faster than preferred treadmill speeds; however, they maintained their stability-enhancing foot placements at all speeds compared to their peers with TD. All adults adapted their gait patterns similarly in response to faster and slower than preferred treadmill-walking speeds. They increased stride frequency and stride length, maintained step width, and decreased percent stance as treadmill speed increased. Older adults with DS, however, adjusted their stride frequencies significantly less than their peers with TD. Our results show that older adults with DS have the capacity to adapt their gait parameters in response to different walking speeds while also supporting the need for intervention to increase gait stability.

No MeSH data available.


Related in: MedlinePlus

Mean dimensionless stride frequency values for each participant, by group and speed. Dimensionless stride frequency values increased as speed increased and were significantly different between groups at the 40% speed but not at the 75% speed or the 110% speed. DS: Down syndrome, TD: typical development.
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fig1: Mean dimensionless stride frequency values for each participant, by group and speed. Dimensionless stride frequency values increased as speed increased and were significantly different between groups at the 40% speed but not at the 75% speed or the 110% speed. DS: Down syndrome, TD: typical development.

Mentions: Follow-up univariate analysis showed that the significant group-by-speed interaction was due to differences in adjustment of dimensionless stride frequency (Huynh-Feldt F(1.34,22.8) = 13.86, P > 0.01). Stride frequency increased from 40% to 75% to 110% speeds in both groups (pairwise comparisons P < 0.01 for all); however, there was less adjustment of stride frequencies at the slower speed by participants with DS as there was a significant group difference in dimensionless stride frequency at the 40% speed (F[1,17] = 8.74, P = 0.01) but not at the 75% (F[1,17] = 3.34, P = 0.09) or 110% (F[1,17] = 0.84, P = 0.37) speeds. Figure 1 shows higher dimensionless stride frequency in the DS group compared to the TD group at the 40% speed but not at the 75% or 110% speeds.


Gait parameter adjustments for walking on a treadmill at preferred, slower, and faster speeds in older adults with down syndrome.

Smith BA, Kubo M, Ulrich BD - Curr Gerontol Geriatr Res (2012)

Mean dimensionless stride frequency values for each participant, by group and speed. Dimensionless stride frequency values increased as speed increased and were significantly different between groups at the 40% speed but not at the 75% speed or the 110% speed. DS: Down syndrome, TD: typical development.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3369407&req=5

fig1: Mean dimensionless stride frequency values for each participant, by group and speed. Dimensionless stride frequency values increased as speed increased and were significantly different between groups at the 40% speed but not at the 75% speed or the 110% speed. DS: Down syndrome, TD: typical development.
Mentions: Follow-up univariate analysis showed that the significant group-by-speed interaction was due to differences in adjustment of dimensionless stride frequency (Huynh-Feldt F(1.34,22.8) = 13.86, P > 0.01). Stride frequency increased from 40% to 75% to 110% speeds in both groups (pairwise comparisons P < 0.01 for all); however, there was less adjustment of stride frequencies at the slower speed by participants with DS as there was a significant group difference in dimensionless stride frequency at the 40% speed (F[1,17] = 8.74, P = 0.01) but not at the 75% (F[1,17] = 3.34, P = 0.09) or 110% (F[1,17] = 0.84, P = 0.37) speeds. Figure 1 shows higher dimensionless stride frequency in the DS group compared to the TD group at the 40% speed but not at the 75% or 110% speeds.

Bottom Line: The combined effects of ligamentous laxity, hypotonia, and decrements associated with aging lead to stability-enhancing foot placement adaptations during routine overground walking at a younger age in adults with Down syndrome (DS) compared to their peers with typical development (TD).All adults adapted their gait patterns similarly in response to faster and slower than preferred treadmill-walking speeds.Older adults with DS, however, adjusted their stride frequencies significantly less than their peers with TD.

View Article: PubMed Central - PubMed

Affiliation: Balance Disorders Laboratory, Departments of Neurology and Behavioral Neuroscience, Oregon Health and Science University, 505 NW 185th Avenue, Beaverton, OR 97006, USA.

ABSTRACT
The combined effects of ligamentous laxity, hypotonia, and decrements associated with aging lead to stability-enhancing foot placement adaptations during routine overground walking at a younger age in adults with Down syndrome (DS) compared to their peers with typical development (TD). Our purpose here was to examine real-time adaptations in older adults with DS by testing their responses to walking on a treadmill at their preferred speed and at speeds slower and faster than preferred. We found that older adults with DS were able to adapt their gait to slower and faster than preferred treadmill speeds; however, they maintained their stability-enhancing foot placements at all speeds compared to their peers with TD. All adults adapted their gait patterns similarly in response to faster and slower than preferred treadmill-walking speeds. They increased stride frequency and stride length, maintained step width, and decreased percent stance as treadmill speed increased. Older adults with DS, however, adjusted their stride frequencies significantly less than their peers with TD. Our results show that older adults with DS have the capacity to adapt their gait parameters in response to different walking speeds while also supporting the need for intervention to increase gait stability.

No MeSH data available.


Related in: MedlinePlus