Validity of the jump-and-reach test in subelite adolescent handball players

The primary purpose of this study was to examine concurrent validity of the jump-and-reach (JaR) test using the Vertec system and a criterion device (i.e., Optojump system). In separate subanalyses, we investigated the influence of gym floor condition and athletes' sex on the validity of vertical jump height. Four hundred forty subelite adolescent female (n = 222, mean age: 14 ± 1 year, age range: 13–15 years) and male (n = 218, mean age: 15 ± 1 year, age range: 14–16 years) handball players performed the JaR test in gyms with region or point elastic floors. Maximal vertical jump height was simultaneously assessed using the Vertec and the Optojump systems. In general, significantly higher jump heights were obtained for the Vertec compared with the Optojump system (11.2 cm, 1%, Cohen's d = 2.58). The subanalyses revealed significantly larger jump heights for the Vertec compared with the Optojump system irrespective of gym floor condition and players' sex. The association between Optojump- and Vertec-derived vertical jump heights amounted to rP = 0.84, with a coefficient of determination (R2) of 0.71. The subanalyses indicated significantly larger correlations in males (rP = 0.75, R2 = 0.56) than in females (rP = 0.63, R2 = 0.40). Yet, correlations were not significantly different between region (rP = 0.83, R2 = 0.69) as opposed to point elastic floor (rP = 0.87, R2 = 0.76). Our findings indicate that the 2 apparatuses cannot be used interchangeably. Consequently, gym floor and sex-specific regression equations were provided to estimate true (Optojump system) vertical jump height from Vertec-derived data.
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Subjects: handball youth junior elite sport test measuring and information system
Notations: sport games
DOI: 10.1519/JSC.0000000000001607
Published in: The Journal of Strength and Conditioning Research
Published: 2017
Volume: 31
Issue: 5
Pages: 1282–1289
Document types: article
Language: English
Level: advanced