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Validity and Reliability of Force-Time Characteristics Using a Portable Load Cell for the Isometric Midthigh Pull
Andrew W Pichardo1, Jono Neville2,3, Farhan Tinwala2,3,4
1IMG Academy, Athletic and Personal Development, Bradenton, Florida.
Journal of Strength and Conditioning Research
|December 12, 2023
Summary
A portable load cell offers a valid and reliable method for measuring peak force during isometric midthigh pulls (IMTP). This cost-effective tool provides an alternative to expensive force plates for assessing maximal strength.
Area of Science:
- Sports Science
- Biomechanics
- Strength and Conditioning
Background:
- The isometric midthigh pull (IMTP) is widely used for assessing maximal strength.
- Traditional force plate systems are often impractical in large team settings due to cost and size.
- Alternative methods for IMTP assessment are needed for wider accessibility.
Purpose of the Study:
- To determine the validity and between-session reliability of force-time characteristics during IMTP.
- To compare a portable load cell method with traditional force plate methods.
- To evaluate peak force, rate of force development (RFD), and impulse.
Main Methods:
- 13 resistance-trained men participated in the study.
- Three experimental protocols were used: fixed bar with force plate (BarFP), flexible chain with force plate (ChainFP), and flexible chain with load cell (ChainLC).
- Testing was replicated across multiple sessions to assess reliability.
Main Results:
- Peak force measurements demonstrated high reliability across all methods (ICC: 0.94–0.98).
- The load cell method (ChainLC) showed the least variability in peak force.
- Rate of force development (RFD) and impulse lacked acceptable reliability across all approaches.
- The ChainFP method underestimated peak force compared to BarFP and ChainLC.
Conclusions:
- A portable load cell is a valid, reliable, and cost-effective alternative for assessing peak force during IMTP.
- The load cell method offers a practical solution for strength and conditioning practitioners.
- RFD and impulse measures using these methods require further investigation for reliability.
