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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS

Rivista di Medicina, Traumatologia e Psicologia dello Sport


Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
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The Journal of Sports Medicine and Physical Fitness 2018 Mar 27

DOI: 10.23736/S0022-4707.18.08195-1

Copyright © 2018 EDIZIONI MINERVA MEDICA

lingua: Inglese

The validity and reliability of the my jump 2 app for measuring the reactive strength index and drop jump performance

Tom HAYNES 1, Chris BISHOP 2, Mark ANTROBUS 3, Jon BRAZIER 1

1 Centre of Applied Science, City and Islington College, London, UK; 2 London Sport Institute, Middlesex University, London, UK; 3 Sport, Exercise and Life Sciences, University of Northampton, Northampton, UK


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BACKGROUND: This is the first study to independently assess the concurrent validity and reliability of the My Jump 2 app for measuring drop jump performance. It is also the first to evaluate the app’s ability to measure the reactive strength index (RSI).
METHODS: Fourteen male sport science students (age: 29.5 ± 9.9 years) performed three drop jumps from 20 cm and 40 cm (totalling 84 jumps), assessed via a force platform and the My Jump 2 app. Reported metrics included reactive strength index, jump height, ground contact time, and mean power. Measurements from both devices were compared using the intraclass correlation coefficient (ICC), Pearson product moment correlation coefficient (r), Cronbach’s alpha (α), coefficient of variation (CV) and BlandAltman plots.
RESULTS: Near perfect agreement was seen between devices at 20 cm for RSI (ICC = 0.95) and contact time (ICC = 0.99) and at 40 cm for RSI (ICC = 0.98), jump height (ICC = 0.96) and contact time (ICC = 0.92); with very strong agreement seen at 20 cm for jump height (ICC = 0.80). In comparison with the force plate the app showed good validity for RSI (20 cm: r = 0.94; 40 cm; r = 0.97), jump height (20 cm: r = 0.80; 40 cm; r = 0.96) and contact time (20 cm = 0.96; 40 cm; r = 0.98).
CONCLUSIONS: The results of the present study show that the My Jump 2 app is a valid and reliable tool for assessing drop jump performance.


KEY WORDS: Physical performance - Drop jumps - Plyometrics - Testing

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Publication History

Article first published online: March 27, 2018
Manuscript accepted: February 8, 2018
Manuscript revised: January 29, 2018
Manuscript received: September 21, 2017

Per citare questo articolo

Haynes T, Bishop C, Antrobus M, Brazier J. The validity and reliability of the my jump 2 app for measuring the reactive strength index and drop jump performance. J Sports Med Phys Fitness 2018 Mar 27. DOI: 10.23736/S0022-4707.18.08195-1

Corresponding author e-mail

Jonnybrazier@hotmail.com