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In a visual inverted pendulum balancing task avoiding impending falls gets harder as we age.

Hannah E Park1, Avijit Bakshi2, James R Lackner2

  • 1Ashton Graybiel Spatial Orientation Laboratory, Brandeis University, MS 033, 415 South Street, Waltham, MA, 02453, USA. hepark@brandeis.edu.

Experimental Brain Research
|January 15, 2025
PubMed
Summary
This summary is machine-generated.

Older adults (OA) exhibit poorer balance control than younger adults (YA) in a simulated inverted pendulum task, making fewer corrective and more destabilizing joystick commands when nearing a fall.

Keywords:
Age-related DifferencesBalancingFallingRisk of FallingSerial DecisionVisual Inverted Pendulum (VIP)

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Area of Science:

  • Biomechanics
  • Human Motor Control
  • Gerontology

Background:

  • Human postural control involves complex sensorimotor integration.
  • Age-related changes in muscle strength and reflex responses can impact balance.
  • The visual inverted pendulum (VIP) is a model system to study balance and control.

Purpose of the Study:

  • To compare the balance control strategies of younger adults (YA) and older adults (OA) using a joystick-controlled VIP.
  • To investigate how simulated age-related decrements (increased gain, delay) affect performance.
  • To identify distinct command dynamics associated with falling versus recovery.

Main Methods:

  • Participants (YA and OA) stabilized a VIP using a joystick.
  • Joystick parameters simulated age-related muscle weakness and reflex slowing.
  • Performance metrics included fall incidence, position/velocity variance, and command types (corrective, destabilizing, inactive).

Main Results:

  • Older adults had higher fall incidence and worse stability/variability than younger adults.
  • Older adults used fewer corrective and more destabilizing commands, particularly when falls were imminent.
  • Command patterns (inactive, corrective, destabilizing) predicted time to fall.
  • Older adults showed less frequent and prompt corrective commands relative to destabilizing ones.

Conclusions:

  • Older adults exhibit age-related deficits in balance control, characterized by altered motor command strategies.
  • The findings suggest a decision-making process in motor control that differs with age, especially under challenging conditions.
  • These insights may inform interventions for fall prevention in older populations.