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Biomechanical approach to quantifying anticipatory postural adjustments in the elderly
1Centre for Studies in Aging, Sunnybrook Health Sciences Centre, University of Toronto, Ontario, Canada.
Medical & Biological Engineering & Computing
|July 1, 1993
Summary
Researchers found that vertical ground reaction force changes best measure anticipatory postural adjustments in older adults. Larger adjustments were linked to fall risk, but data screening limits practical use.
Area of Science:
- Biomechanics
- Gerontology
- Motor Control
Background:
- Quantifying anticipatory postural adjustments (APAs) is crucial for understanding balance in the elderly.
- Existing biomechanical approaches face measurement challenges in older populations.
- Signal-to-noise properties of different measures need evaluation for accuracy.
Purpose of the Study:
- To compare the efficacy of different biomechanical measures for quantifying APAs in the elderly.
- To assess the relationship between APAs and falling risk in older adults.
- To identify a reliable method for measuring APAs for clinical or research applications.
Main Methods:
- Utilized data from volitional unilateral arm-raise tests on 100 elderly subjects.
- Compared signal-to-noise properties of vertical ground reaction force, horizontal force, and center-of-pressure displacement.
- Derived a normalized measure of relative anticipatory response based on vertical ground reaction force.
Main Results:
- Vertical ground reaction force changes demonstrated superior signal-to-noise properties compared to other measures.
- Larger relative anticipatory adjustments were observed in elderly subjects with recurrent falls.
- Averaging responses and excluding noisy trials were necessary to detect these differences.
Conclusions:
- Vertical ground reaction force normalization offers potential for accurate APA measurement in the elderly.
- Disordered motor programming, indicated by altered APAs, may be associated with increased fall risk.
- Data screening requirements may limit the practical application of this biomechanical approach in elderly populations.