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Abstract
The aim of this study was to test the validity and reliability of the inertial device WIMU (Realtrack Systems SL, Almería, Spain) for the assessment of the vertical jump, counter movement jump (CMJ) and squat jump (SJ). Fifteen soccer players were evaluated in two identical sessions separated by one week. In each session, participants performed three jumps of each type. The flight time was quantified by the inertial device WIMU and by a force platform (Twin Plates; Globus Sport and Health Technologies LLC, Codogné, Italy) at the same time. For the analysis of reliability of the flight time of the CMJ and the SJ, the intraclass correlation coefficient was used. The calculation of the concurrent validity was performed by using the Pearson correlation coefficient (r). This analysis was complemented with the realization of the Bland–Altman plots. For the analysis of reliability, the coefficient of variation and the standard error of the means were calculated. The analysis presented a high validity and reliability of the device. The results show the inertial device WIMU (Realtrack Systems SL, Almería, Spain) as a useful tool for measuring the jump capacity of the athletes, presenting immediate results in real time, on any type of surface and in a simple way since it does not need cables.
Highlights
One of the most commonly used indicators to assess physical fitness in different in both the general population and high performance sports, and for identifying young talents (Balsalobre-Fernandez, Glaister & Lockey, 2015) is the vertical jump
The descriptive analysis showed that the flight time registered by the inertial device WIMUTM was almost identical than the one registered by the plate (Table 1), but there
The results show the high concurrent validity and reliability that the WIMUTM device presents compared with a force plate
Summary
One of the most commonly used indicators to assess physical fitness in different in both the general population and high performance sports, and for identifying young talents (Balsalobre-Fernandez, Glaister & Lockey, 2015) is the vertical jump. Jump performance plays a crucial role in both the predominantly anaerobic and aerobic disciplines, as well as in the mixed disciplines (Brumitt et al, 2014; Hartman et al, 2007). This can be measured by different tools or systems (force plates, video analysis, photoelectric cells, contact mat, video cameras, etc.) (Bui et al, 2015; Casartelli, Muller & Maffiuletti, 2010; Dias et al, 2011) and more recently with phone apps as My Jump (Balsalobre-Fernandez, Glaister & Lockey, 2015).
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