Chapter 9: Aging and Postural Control Flashcards
def - when one sensory system is less reliable, the input to the CNS from that system is weighted less heavily, and inputs from other systems will be weighted more heavily
sensory weighting hypothesis
primary factor contributing to aging
genetic - contribute to the loss of neuronal function within a system over which we have LITTLE control over
secondary factor contributing to aging
experiential - environment, nutrition, and lifestyle, affect out NS function over which we have MORE control
what are the age related changes in the M/S system
reduced ROM, diminished spinal flexibility, altered posture, decreased muscle strength
older adults demonstrated what when responding to a platform movement?
slower response onset in key muscles, increased co activation to stiffen the joint
forward sway ankle strategy uses what muscles? anterior or posterior?
posterior
backward sway ankle strategy uses what muscles? anterior or posterior?
anterior
for the ankle strategy, what is the timing of activation?
distal to proximal
vibratory sensation threshold (increases/decreases) with age
increases
tactile sensitivity threshold (increases/decreases) with age
decreases (or increased threshold to touch stimuli)
visual threshold (increases/decreases) with age
increases
visual acuity (increases/decreases) with age
decreases
aging causes a (increase/decrease) in vestibular function
decrease
true or false: Healthy older adults do not show significantly larger sway than young adults when ability or availability of a single one sense is reduced.
true
true or false: when there is more than one sense reduced, there appears to be a significant effect on steadiness
true
