18aging - Postural Control in the Elderly Decrease in...

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4/12/10 1 Postural Control in the Elderly Decrease in postural stability with age Older people = more unstable – More postural sway when standing – Less able to adapt to postural perturbations
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4/12/10 2 Age related changes in systems of postural control Muscular and skeletal changes – 40% decrease in strength between 30-80 years. – Decrease in range of motion – More co-contraction
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4/12/10 3 • Muscle response a.er a perturba1on is slower in elderly • Even slower in elderly with various impairments Small vs. Large Perturba1ons Age related changes in systems of postural control Sensory changes – Vision Lens elasticity and corneal opacities – Proprioceptive Vibration and tactile thresholds higher – Vestibular 40% loss in hair cells by 70 years
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4/12/10 4 • Older adults have exaggerated response to the moving room. • Unstable older adults exhibit even greater response. • Appears that with aging, older adults can be more easily destabilized based on vision Age related changes in systems of postural control Cognitive changes – Number of brain cells and synapses decrease. – Leads to decreased cognitive resources which may influence postural control.
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