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Head stability in older adults during walking with and without visual input
R L Cromwell1, R A Newton, G Forrest
1Physical Therapy Department, University of Texas Medical Branch, Galveston 77555, USA. rlcromwe@utmb.edu
Journal of Vestibular Research : Equilibrium & Orientation
|February 16, 2002
Summary
Older adults struggle to maintain head stability when vision is lost, indicating reduced adaptability in head-trunk coordination due to age-related sensory system changes.
Area of Science:
- Gerontology
- Biomechanics
- Neuroscience
Background:
- Head stabilization is crucial for maintaining clear vision during locomotion.
- Older adults often experience declines in sensory systems (vision, vestibular, proprioception) impacting balance and coordination.
- Understanding age-related changes in head-trunk coordination is vital for fall prevention and mobility assessment.
Purpose of the Study:
- To analyze head stabilization in older adults across various walking frequencies.
- To evaluate the adaptive capacity of head-trunk coordination in older adults without visual input.
Main Methods:
- Measured sagittal plane head and trunk angular velocities in 17 healthy older adults during walking with eyes open and eyes closed.
- Utilized frequency analyses to assess head-trunk coordination (gain and phase) across the walking frequency spectrum.
- Recorded average walking velocity and cadence.
Main Results:
- Walking velocity decreased significantly when eyes were closed (EC).
- Head stability deteriorated during EC, evidenced by increased head velocities across frequencies.
- Head-trunk coordination showed diminished adaptability during EC, with increased gain and unchanged phase, suggesting impaired movement control.
Conclusions:
- Older adults exhibit reduced head stability and impaired head-trunk coordination when vision is absent.
- The inability to adapt head-trunk movements suggests age-related declines in the plasticity of vestibular and proprioceptive systems.
- These findings highlight the critical role of vision in maintaining head stability for older adults and point to potential sensorimotor deficits with aging.