Measurement errors when estimating the vertical jump height with flight time using photocell devices: the example of Optojump

A Attia; W Dhahbi; A Chaouachi; J Padulo; DP Wong; K Chamari

doi:10.5114/biolsport.2017.63735

eISSN: 2083-1862
ISSN: 0860-021X

Biology of Sport

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abstract:

Original paper

Measurement errors when estimating the vertical jump height with flight time using photocell devices: the example of Optojump

A Attia

^{1, 2}

,

W Dhahbi

^{3, 4}

,

A Chaouachi

^{3, 5}

,

J Padulo

^{3, 6, 7}

,

DP Wong

⁸

,

K Chamari

⁹

Higher Institute of Sports and Physical Education, Manouba University, Tunis, Tunisia
Research Unit, Analysis and Evaluation of Factors Affecting the Sport Performance, Higher Institute of Sports and Physical Education, Manouba University, Tunis, Tunisia
Tunisian Research Laboratory “Sport Performance Optimisation”, National Center of Medicine and Science in Sports (CNMSS), Tunis, Tunisia
Université de Tunis El Manar, Faculté des Sciences de Tunis, Tunisia
Sports Performance Research Institute New Zealand (SPRINZ), AUT Millennium Institute, AUT University, Auckland, New Zealand
Faculty of Kinesiology, University of SpLit, SpLit, Croatia
University eCampus, Novedrate, Italy
Sport Science Research Center, Shandong Sport University, Jinan, China
Athlete Health and Performance Research Centre, ASPETAR, Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar

Biol. Sport 2017;34:63-70

DOI: https://doi.org/10.5114/biolsport.2017.63735

Online publish date: 2016/12/09

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Common methods to estimate vertical jump height (VJH) are based on the measurements of flight time (FT) or vertical reaction force. This study aimed to assess the measurement errors when estimating the VJH with flight time using photocell devices in comparison with the gold standard jump height measured by a force plate (FP). The second purpose was to determine the intrinsic reliability of the Optojump photoelectric cells in estimating VJH. For this aim, 20 subjects (age: 22.50±1.24 years) performed maximal vertical jumps in three modalities in randomized order: the squat jump (SJ), counter-movement jump (CMJ), and CMJ with arm swing (CMJarm). Each trial was simultaneously recorded by the FP and Optojump devices. High intra-class correlation coefficients (ICCs) for validity (0.98-0.99) and low limits of agreement (less than 1.4 cm) were found; even a systematic difference in jump height was consistently observed between FT and double integration of force methods (-31% to -27%; p<0.001) and a large effect size (Cohen’s d>1.2). Intra-session reliability of Optojump was excellent, with ICCs ranging from 0.98 to 0.99, low coefficients of variation (3.98%), and low standard errors of measurement (0.8 cm). It was concluded that there was a high correlation between the two methods to estimate the vertical jump height, but the FT method cannot replace the gold standard, due to the large systematic bias. According to our results, the equations of each of the three jump modalities were presented in order to obtain a better estimation of the jump height.

keywords:

Measurement errors when estimating the vertical jump height with flight time using photocell devices: the example of Optojump

A Attia 1, 2 , W Dhahbi 3, 4 , A Chaouachi 3, 5 , J Padulo 3, 6, 7 , DP Wong 8 , K Chamari 9

Flight time, Performance analysis, Muscle power, Vertical jump

A Attia

^{1, 2}

,

W Dhahbi

^{3, 4}

,

A Chaouachi

^{3, 5}

,

J Padulo

^{3, 6, 7}

,

DP Wong

⁸

,

K Chamari

⁹