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Concurrent Validity and Reliability of In-Field Vertical Jump Performance Measures on Sand Surfaces.
Svenja Wirtz1, Ross Julian1,2, Rieke Schmale1
1Department of Neuromotor Behavior and Exercise, Institute of Sport and Exercise Sciences, University of Münster, Münster, Germany; and.
Journal of Strength and Conditioning Research
|December 13, 2023
Summary
The MyJump2 device accurately and reliably measures vertical jump height on sand, unlike the VERT device. This finding is crucial for evaluating athletes in beach sports like volleyball and soccer.
Area of Science:
- Biomechanics and Sports Science
- Athletic Performance Measurement
- Human Movement Analysis
Background:
- Beach sports demand explosive jumping actions on unstable sand surfaces.
- Accurate and feasible in-field measurement tools for jump performance on sand are lacking.
- Evaluating countermovement jump (CMJ) performance is vital for training and talent identification in beach athletes.
Purpose of the Study:
- To determine the reliability and concurrent validity of MyJump2 and VERT devices for measuring CMJ height on sand.
- To compare the accuracy of MyJump2 and VERT against a criterion standard force plate.
- To provide recommendations for valid and reliable jump measurement tools in beach sports settings.
Main Methods:
- Twenty-one participants performed five CMJs on a sand surface.
- Jumping height was simultaneously recorded using a force plate, MyJump2, and VERT (inertial measurement unit).
- Reliability (intraclass correlation coefficients - ICCs, day-to-day, interrater, intrarater) and concurrent validity (ICCs, Bland-Altman plots) were assessed.
Main Results:
- MyJump2 demonstrated near-perfect intrarater (ICC=0.98) and interrater (ICC=0.98) reliability.
- MyJump2 showed near-perfect concurrent validity against the force plate (ICC=0.92, bias=-2.31 cm).
- VERT exhibited only moderate agreement with the force plate (ICC=0.55, bias=6.31 cm) despite good day-to-day reliability (ICC=0.79).
Conclusions:
- MyJump2 is a valid and reliable tool for assessing vertical jump performance on sand surfaces.
- The VERT device is not recommended for measuring jump height on sand due to insufficient concurrent validity.
- MyJump2 offers a practical solution for coaches and researchers evaluating athletes in beach sports.
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