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Changes in multi-joint performance with age.

Rachael D Seidler1, Jay L Alberts, George E Stelmach

  • 1Department of Movement Science, University of Michigan, Ann Arbor, MI 48109-2214, USA.

Motor Control
|February 14, 2002
PubMed
Summary
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Elderly adults show coordination deficits in multi-joint movements, impacting accuracy and smoothness. They use muscle coactivation differently than younger adults to compensate for age-related motor control changes.

Area of Science:

  • Gerontology
  • Motor Control
  • Biomechanics

Background:

  • Aging is associated with changes in motor control.
  • Understanding age-related differences in multi-joint movement is crucial for maintaining functional independence.

Purpose of the Study:

  • To investigate age-related deficits in the performance of multi-joint arm movements.
  • To compare coordination and muscle activation patterns between elderly and young adults.

Main Methods:

  • Two groups (elderly, mean age 68.9; young, mean age 30.1) performed planar arm pointing movements.
  • Movements involved single-joint (elbow extension) and multi-joint (elbow extension and shoulder flexion) tasks.
  • Kinematic data and muscle coactivation were analyzed.

Related Experiment Videos

Main Results:

  • Elderly adults exhibited decreased movement smoothness and accuracy with increased shoulder joint involvement.
  • Elderly adults showed higher coactivation for single-joint movements but reduced coactivation for multi-joint movements compared to young adults.
  • Reduced coactivation in elderly adults during multi-joint tasks correlated with poorer performance.

Conclusions:

  • Elderly adults have selective coordination deficits in multi-joint movements.
  • Age-related differences in muscle coactivation strategies impact motor performance.
  • Elderly individuals may use coactivation differently to manage energy costs and planning complexity in multi-joint actions.