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Related Experiment Videos

Postural coordination in elderly subjects standing on a periodically moving platform.

A Nardone1, M Grasso, J Tarantola

  • 1Division of Physical Therapy and Rehabilitation, Rehabilitation Institute of Veruno, Salvatore Maugeri Foundation, IRCCS, Veruno, Italy.

Archives of Physical Medicine and Rehabilitation
|September 15, 2000
PubMed
Summary

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Dynamic equilibrium control declines with age, affecting body segment coordination on moving platforms. This study reveals how aging impacts balance strategies, particularly with reduced vision and increased platform frequency.

Area of Science:

  • Biomechanics
  • Human Physiology
  • Gerontology

Background:

  • Maintaining dynamic equilibrium is crucial for preventing falls, especially in older adults.
  • Age-related changes in sensorimotor control can impair balance during complex tasks.
  • Understanding body segment coordination is key to assessing balance deficits.

Purpose of the Study:

  • To investigate body segment coordination during dynamic equilibrium on a moving platform.
  • To evaluate age-related differences in balance control performance.
  • To assess the impact of visual conditions and platform frequency on postural stability.

Main Methods:

  • Fifty-three healthy participants (aged 17-89) stood on a translating platform.
  • Infrared markers tracked head and hip kinematics.

Related Experiment Videos

  • Optoelectronic device measured marker displacement and cross-correlation for segment coupling.
  • Trials were conducted with eyes open (EO) and eyes closed (EC) at 0.2Hz and 0.6Hz frequencies.

    • Main Results:

    • At 0.2Hz, younger subjects stabilized the head more (EO), while older adults showed greater head stabilization but looser head-hip coupling.
    • With eyes closed (EC), the body acted as an inverted pendulum, with aging associated with reduced head stabilization and tighter head-hip coupling.
    • At 0.6Hz, especially with EC, older adults struggled to counteract head displacement, and segment coupling was poor across all ages.

    Conclusions:

    • Periodic platform translation effectively assesses balance control in the elderly.
    • This method can identify age-related sensorimotor changes affecting dynamic equilibrium.
    • The findings highlight the importance of vision and sensory feedback in maintaining balance with age.