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A new method for measuring power output in a single leg extension: feasibility, reliability and validity
1Department of Physiology and Pharmacology, University of Nottingham Medical School, Queen's Medical Centre UK.
Summary
A new method safely measures leg extensor power (LEP) in all ages. This reliable test shows power is lower in women and declines with age, especially when not adjusted for body mass.
Area of Science:
- Biomechanics
- Exercise Physiology
- Gerontology
Background:
- Assessing leg extensor power (LEP) is crucial for evaluating physical capability across diverse populations.
- Existing methods may have limitations in safety, accessibility, or applicability to all age groups and physical abilities.
Purpose of the Study:
- To introduce and validate a novel, safe, and reliable method for measuring leg extensor power (LEP).
- To assess the reliability and characterize LEP in a wide age range of adults.
Main Methods:
- A seated leg extension movement against a pedal, transmitting force via a lever and chain to a flywheel.
- Flywheel velocity measured by an optoswitch to calculate average leg extensor power (LEP).
- Reliability tested on 46 subjects (20-86 years) over two sessions; subgroup analysis for observer experience.
Main Results:
- Maximal LEP ranged from 30 to 300 W (mean 154 W).
- High test-retest reliability (coefficient of variation 9.4%, subgroup 6.3%).
- LEP was lower in women and declined with age, with a persistent decline when normalized for body mass.
Conclusions:
- The described method provides a safe, reliable, and acceptable means to measure leg extensor power (LEP) across all ages and capabilities.
- Findings highlight significant age-related declines and sex differences in LEP, underscoring the need for age and sex-specific performance benchmarks.
- The method's reliability supports its use in clinical and research settings for assessing lower limb function.