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Evidence for a non-linear relationship between leg strength and gait speed
D M Buchner1, E B Larson, E H Wagner
1Department of Health Services, University of Washington, Seattle 98195-8852, USA.
Age and Ageing
|September 1, 1996
Summary
Leg strength and gait speed in older adults show a non-linear relationship. Weaker individuals experience greater gait speed changes with strength improvements, unlike stronger individuals.
Area of Science:
- Gerontology
- Biomechanics
- Exercise Physiology
Background:
- The relationship between muscular strength and physical performance in older adults is often assumed to be linear, but empirical evidence is limited.
- Understanding this relationship is crucial for interventions aimed at improving mobility and preventing frailty in aging populations.
Purpose of the Study:
- To investigate the empirical evidence for a non-linear relationship between leg strength and gait speed in older adults.
- To determine if non-linear models better explain the variance in gait speed compared to linear models.
Main Methods:
- A population-based sample of 409 adults aged 60-96 years was recruited.
- Leg strength was assessed in four muscle groups of both legs using an isokinetic dynamometer.
- Usual gait speed was measured over a 15.2-meter course.
Main Results:
- Linear models explained 17% of the variance in gait speed, while non-linear models explained 22%.
- The non-linear relationship indicated that strength gains had a significant impact on gait speed in weaker individuals but not in stronger ones.
- Body weight and age were significant predictors of gait speed, whereas sex and height were not.
Conclusions:
- The study supports a non-linear relationship between leg strength and gait speed in older adults, applicable to both sexes.
- This finding highlights that physiological capacity changes have a more pronounced effect on the performance of frail individuals compared to healthy ones.