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The effects of motion on force control abilities.

J M Schiffman1, C W Luchies

  • 1Department of Mechanical Engineering, University of Kansas, 3013 Learned Hall, Lawrence, KS 66045-2234, USA.

Clinical Biomechanics (Bristol, Avon)
|June 28, 2001
PubMed
Summary

Motion and higher force levels impair knee extensor strength control in both younger and older adults. Older adults showed greater deficits in isokinetic tasks, highlighting age-related differences in dynamic force regulation.

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Area of Science:

  • Biomechanics
  • Motor Control
  • Gerontology

Background:

  • Assessing strength control, not just capacity, offers valuable insights for therapeutic interventions.
  • Understanding factors affecting submaximal force regulation is crucial for maintaining functional independence.

Purpose of the Study:

  • To investigate the impact of motion on submaximal force control in knee extensors.
  • To compare force control abilities between younger and older adults under different conditions.

Main Methods:

  • Quasi-experimental design analyzing force control tasks.
  • Participants maintained knee extensor strength at 20% and 60% of maximal voluntary contraction.
  • Evaluated isometric and isokinetic force control with visual feedback.

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Main Results:

  • Motion decreased force control performance for both age groups and force levels.
  • Isokinetic conditions increased force variability compared to isometric.
  • Higher force levels and motion exacerbated performance decrements, especially in older adults.

Conclusions:

  • Motion and increased force levels significantly impair submaximal force control in healthy adults.
  • Age-related differences in force control become more pronounced with added motion and higher force demands.
  • Methodology for isometric force control assessment was successfully adapted for isokinetic testing.