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Biomechanical demands of the 2-step transitional gait cycles linking level gait and stair descent gait in older women

Alcock, Lisa; O'Brien, Thomas D.; Vanicek, Natalie


Lisa Alcock

Thomas D. O'Brien


Stair descent is an inherently complex form of locomotion posing a high falls risk for older adults, specifically when negotiating the transitional gait cycles linking level gait and descent. The aim of this study was to enhance our understanding of the biomechanical demands by comparing the demands of these transitions. Lower limb kinematics and kinetics of the 2-step transitions linking level and descent gait at the top (level-to-descent) and the bottom (descent-to-level) of the staircase were quantified in 36 older women with no falls history. Despite undergoing the same vertical displacement (2-steps), the following significant (p<.05) differences were observed during the top transition compared to the bottom transition: reduced step velocity; reduced hip extension and increased ankle dorsiflexion (late stance/pre-swing); reduced ground reaction forces, larger knee extensor moments and powers (absorption; late stance); reduced ankle plantarflexor moments (early and late stance) and increased ankle powers (mid-stance). Top transition biomechanics were similar to those reported previously for continuous descent. Kinetic differences at the knee and ankle signify the contrasting and prominent functions of controlled lowering during the top transition and forward continuance during the bottom transition. The varying musculoskeletal demands encountered during each functional sub-task should be addressed in falls prevention programmes with elderly populations where the greatest clinical impact may be achieved. Knee extensor eccentric power through flexion exercises would facilitate a smooth transition at the top and improving ankle plantarflexion strength during single and double limb stance activities would ease the transition into level gait following continuous descent.


Alcock, L., O'Brien, T. D., & Vanicek, N. (2015). Biomechanical demands of the 2-step transitional gait cycles linking level gait and stair descent gait in older women. Journal of biomechanics, 48(16), 4191-4197.

Journal Article Type Article
Acceptance Date Sep 24, 2015
Online Publication Date Oct 9, 2015
Publication Date Dec 16, 2015
Deposit Date Dec 2, 2015
Publicly Available Date Nov 23, 2017
Journal Journal of biomechanics
Print ISSN 0021-9290
Electronic ISSN 1873-2380
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 48
Issue 16
Pages 4191-4197
Keywords Older women, Gait, Stair descent, Transition biomechanics
Public URL
Publisher URL
Additional Information Authors' accepted manuscript of article published in: Journal of biomechanics, 2015, v.48, issue 16.


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