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Dynamic postural control during (in)visible curb descent at fast versus comfortable walking velocity
Soran AminiAghdam1, Eric Griessbach2, Johanna Vielemeyer3
1Department of Motion Science, Institute of Sport Science, Friedrich-Schiller-University Jena, Jena, Thuringia, Germany; Department of Neurology/Department of Orthopedic Surgery, Bayreuth Hospital, Bayreuth, Bavaria, Germany.
Gait & Posture
|April 22, 2019
Summary
Navigating camouflaged curbs at faster speeds challenges postural control, especially with higher curbs. Increased walking velocity independently reduces stability, limiting compensatory base-of-support adjustments.
Area of Science:
- Biomechanics
- Human locomotion
- Postural control
Background:
- Unexpected ground-contact onset during gait, like with camouflaged curbs, challenges postural control.
- These challenges may worsen at faster walking velocities.
Purpose of the Study:
- To investigate if traversing camouflaged curbs at fast speeds induces greater postural instability compared to visible curbs.
- To assess changes in the margin of stability (MoS) during curb negotiation and recovery steps.
Main Methods:
- Twelve healthy participants walked over visible and camouflaged curbs (0 and 10 cm) at comfortable and fast velocities.
- Margin of stability (MoS) was measured at foot touchdown during descent and the first recovery step.
- Repeated-measurement ANOVAs analyzed the effects of velocity, elevation, and visibility on MoS.
Main Results:
- No increased instability for camouflaged vs. visible curbs at faster speeds during descent (no 3-way interaction).
- A significant decrease in MoS occurred when descending 10-cm camouflaged curbs due to greater center-of-mass displacement and velocity.
- Faster walking velocity independently reduced MoS and shifted the center-of-mass forward.
- Recovery steps showed reduced stability when walking faster or from camouflaged curbs.
Conclusions:
- While walking velocity significantly impacts postural control, the increased instability from camouflaged curbs is not solely velocity-dependent in young adults.
- The ability to widen the base of support to compensate for increased center-of-mass velocity is limited at higher walking speeds.
- Further research including elderly populations is recommended.
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