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Rapid force generation during unilateral isometric hamstring assessment: reliability and relationship to maximal
N J Ripley1, J Fahey1, M Cuthbert1,2
1School of Health and Society, University of Salford, Salford, UK.
Sports Biomechanics
|November 9, 2023
Summary
The 90-90 isometric hamstring assessment reliably measures peak force and rapid force development in female athletes. This allows for confident tracking of performance changes and fatigue monitoring.
Area of Science:
- Sports Medicine
- Biomechanics
- Exercise Physiology
Background:
- Limited research exists on the reliability of rapid force generation during isometric hamstring assessments.
- Understanding these characteristics is crucial for athlete performance monitoring and injury prevention.
Purpose of the Study:
- To determine the between-session reliability of rapid force generating characteristics of the hamstrings.
- To examine the relationship between rapid force generation and maximal force production.
Main Methods:
- Twenty-three female soccer players performed unilateral 90-90 isometric hamstring assessments on two occasions, 7 days apart.
- Measures included peak force, force at specific time points (100ms, 200ms), and average rate of force development (aRFD).
Main Results:
- Absolute and fair-good reliability (ICC > 0.610) were found for peak force and all rapid force generating measures.
- Significant and meaningful relationships (r > 0.802) were observed between rapid force measures and peak force.
Conclusions:
- The 90-90 isometric hamstring assessment is a reliable tool for evaluating both peak and rapid force production.
- Practitioners can confidently use this assessment for tracking athlete performance and managing fatigue.
