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Influence of lateral destabilization on compensatory stepping responses
B E Maki1, W E McIlroy, S D Perry
1Centre for Studies in Aging, University of Toronto, Canada.
Journal of Biomechanics
|March 1, 1996
Summary
Lateral destabilization significantly impacts compensatory stepping responses. The body preferentially unloads the swing leg, leading to faster foot-lift but more complex trajectories, highlighting the need for multi-directional balance assessment.
Area of Science:
- Biomechanics
- Human Movement Science
- Neuroscience
Background:
- Previous research on compensatory stepping primarily focused on sagittal plane (forward/backward) movements.
- Real-life postural perturbations often involve lateral components, necessitating investigation into non-sagittal stepping responses.
Purpose of the Study:
- To investigate the effects of lateral destabilization on compensatory stepping.
- To analyze swing-leg selection, preparatory unloading, and swing trajectory characteristics during lateral perturbations.
Main Methods:
- Utilized a novel multi-directional moving platform to apply transient perturbations in eight horizontal directions.
- Tested 10 healthy young adults, varying perturbation magnitude unpredictably.
- Instructed participants to avoid volitional stepping to isolate reactive responses.
Main Results:
- 96% of lateral stepping responses involved swinging the leg unloaded by the perturbation.
- Swinging the unloaded leg resulted in faster foot-lift but a longer, more complex swing trajectory.
- Lateral perturbations led to reduced time to foot-off, increased step length, and longer swing duration compared to sagittal perturbations.
Conclusions:
- Compensatory stepping to non-sagittal perturbations is significantly influenced by biomechanical factors not apparent in sagittal plane studies.
- Assessing postural responses in multiple directions is crucial for a comprehensive understanding of balance maintenance in daily life.