Intersession and Intrasession Reliability and Validity of the My Jump App for Measuring Different Jump Actions in Trained Male and Female Athletes.
Gallardo-Fuentes, F, Gallardo-Fuentes, J, Ramírez-Campillo, R, Balsalobre-Fernández, C, Martínez, C, Caniuqueo, A, Cañas, R, Banzer, W, Loturco, I, Nakamura, FY, and Izquierdo, M. Intersession and intrasession reliability and validity of the My Jump app for measuring different jump actions in trained male and female athletes. J Strength Cond Res 30(7): 2049-2056, 2016-The purpose of this study was to analyze the concurrent validity and reliability of the iPhone app named My Jump for measuring jump height in 40-cm drop jumps (DJs), countermovement jumps (CMJs), and squat jumps (SJs). To do this, 21 male and female athletes (age, 22.1 ± 3.6 years) completed 5 maximal DJs, CMJs, and SJs on 2 separate days, which were evaluated using a contact platform and the app My Jump, developed to calculate jump height from flight time using the high-speed video recording facility on the iPhone. A total of 630 jumps were compared using the intraclass correlation coefficient (ICC), Bland-Altman plots, Pearson's product moment correlation coefficient (r), Cronbach's alpha (α), and coefficient of variation (CV). There was almost perfect agreement between the measurement instruments for all jump height values (ICC = 0.97-0.99), with no differences between the instruments (p > 0.05; mean difference of 0.2 cm). Almost perfect correlation was observed between the measurement instruments for SJs, CMJs, and DJs (r = 0.96-0.99). My Jump showed very good within-subject reliability (α = 0.94-0.99; CV = 3.8-7.6) and interday reliability (r = 0.86-0.95) for SJs, CMJs, and DJs in all subjects. Therefore, the iPhone app named My Jump provides reliable intersession and intrasession data, as well as valid measurements for maximal jump height during fast (i.e., DJs) and slow (i.e., CMJs) stretch-shortening cycle muscle actions, and during concentric-only explosive muscle actions (i.e., SJs), in both male and female athletes in comparison with a professional contact platform.
1Department of Physical Activity Sciences, University of Los Lagos, Osorno, Chile; 2Department of Physical Education, Sport and Human Movement, Autonomous University of Madrid, Madrid, Spain; 3Department of Physical Education, Sport and Recreation, University of La Frontera, Temuco, Chile; 4Laboratory of Physiology and Biomechanics, University Autónoma de Chile, Temuco, Chile; 5Laboratory of Physiology, Department of Biological Sciences, Faculty of Biological Sciences, Andrés Bello University, Viña del Mar, Chile; 6School of Kinesiology, Faculty of Medicine, Diego Portales University, Viña del Mar, Chile; 7Department of Sports Medicine, Goethe-University, Frankfurt am Main, Germany; 8Nucleus of High Performance in Sport-NAR, São Paulo, Brazil; 9State University of Londrina, Londrina, Brazil; and 10Department of Health Sciences, Public University of Navarre, Pamplone, Spain.
Francisco
F
Gallardo-Fuentes
Jorge
J
Gallardo-Fuentes
Rodrigo
R
Ramírez-Campillo
Carlos
C
Balsalobre-Fernández
Cristian
C
Martínez
Alexis
A
Caniuqueo
Rodrigo
R
Cañas
Winfried
W
Banzer
Irineu
I
Loturco
Fabio Y
FY
Nakamura
Mikel
M
Izquierdo
D000328:Adult; D054874:Athletic Performance / Q000502:physiology*; D005080:Exercise Test / Q000295:instrumentation / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D063731:Mobile Applications; D015203:Reproducibility of Results; D000068997:Smartphone; D014741:Video Recording; D055815:Young Adult