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The effects of motion on force control abilities
1Department of Mechanical Engineering, University of Kansas, 3013 Learned Hall, Lawrence, KS 66045-2234, USA.
Clinical Biomechanics (Bristol, Avon)
|June 28, 2001
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.
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.
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.