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Related Experiment Videos

Age-related differences in inter-digit coupling during finger pinching.

Justin Keogh1, S Morrison, R Barrett

  • 1Institute of Sport and Recreation Research New Zealand, Division of Sport and Recreation, Auckland University of Technology, Private Bag 92006, 1020, Auckland, New Zealand. justin.keogh@aut.ac.nz

European Journal of Applied Physiology
|February 24, 2006
PubMed
Summary

Older adults exhibit poorer finger-pinch force control due to age-related changes in how they share and coordinate forces between digits. These deficits are more apparent in specific tasks and force levels.

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Area of Science:

  • Biomechanics
  • Motor Control
  • Gerontology

Background:

  • Aging is associated with declines in motor function, including force production and control.
  • Understanding age-related changes in fine motor skills like finger-pinch force is crucial for maintaining independence.

Purpose of the Study:

  • To investigate age-related differences in finger-pinch force control, digit force sharing, and digit coupling.
  • To examine how force level and target shape influence these age-related changes.

Main Methods:

  • 13 young and 14 older adults performed isometric tri-digit finger-pinch tasks.
  • Four conditions varied mean force level (20% and 40% MVC) and target shape (constant and sinusoidal).
  • Analyses included force variability, targeting error, spectral analysis, digit force contribution, and cross-correlation of force and EMG signals.

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Main Results:

  • Older adults showed significantly reduced force control (greater variability and error) compared to young adults.
  • Age-related deficits were more pronounced at lower forces and in sinusoidal conditions.
  • Older adults exhibited altered digit force sharing (increased index, decreased middle finger contribution) and reduced coupling, particularly in sinusoidal tasks.

Conclusions:

  • Reduced finger-pinch force control in older adults is linked to age-related changes in digit force sharing and coupling.
  • The observed differences are task-dependent, varying with force level and target dynamics.
  • These findings highlight the complex interplay of factors contributing to motor decline in aging.