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Accuracy of Three Field-Based Devices for Measuring Counter Movement Jump Performance in Elite Female Volleyball
Will C Wright1,2, Michael V Fedewa1, Elroy J Aguiar1
1Exercise Physiology Laboratory, Department of Kinesiology, The University of Alabama, Tuscaloosa, AL.
Journal of Strength and Conditioning Research
|August 22, 2025
Summary
A mobile phone app accurately measured countermovement jump (CMJ) height in elite female volleyball players, outperforming other field devices. However, caution is advised when using these tools to assess CMJ mean power.
Area of Science:
- Sports Science
- Biomechanics
- Performance Analysis
Background:
- Accurate measurement of jump performance is crucial for training and talent identification in sports.
- Field-based devices offer convenience but their validity compared to criterion measures needs thorough investigation.
- Elite female volleyball players require precise assessment of explosive power, particularly the countermovement jump (CMJ).
Purpose of the Study:
- To evaluate the accuracy of three field-based devices (jump-and-reach device, linear position transducer, mobile phone application) for measuring countermovement jump (CMJ) performance.
- To compare the validity of these devices against a criterion force plate system in elite female volleyball players.
Main Methods:
- Sixteen elite female collegiate volleyball players performed countermovement jumps (CMJs).
- Jump performance was simultaneously recorded using a force plate (criterion standard), a jump-and-reach device, a linear position transducer, and a mobile phone application.
- Data analysis focused on CMJ height and mean power, comparing measurements from field devices against force plate data.
Main Results:
- The mobile phone application (APP) demonstrated the highest accuracy for CMJ height, showing the strongest correlation (r=0.99) and smallest error compared to the force plate (FP).
- CMJ height measured by the APP (35.32 ± 3.75 cm) was comparable to the FP (36.16 ± 3.88 cm), while the jump-and-reach device and linear position transducer showed significant overestimations.
- Field devices exhibited considerable error and large limits of agreement for CMJ mean power, indicating lower validity for this metric compared to jump height.
Conclusions:
- The mobile phone application is a valid tool for assessing countermovement jump (CMJ) height in elite female volleyball players.
- Significant discrepancies exist in mean power measurements between field-based devices and the criterion force plate.
- Athletes and coaches should exercise caution when interpreting CMJ mean power data obtained from field-based measurement tools.
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