Reliability of Squat and Countermovement Jump Tests in Children 6 to 8 Years of Age

Abstract

The aim of this study was to determine the reliability of the squat jump test (SJ) and countermovement jump test (CMJ), in fifty-six children (30 girls and 26 boys) with ages ranging from 6 to 8 years. Each subject performed two evaluation sessions (T1, T2) with seven days between tests. The results show that the CMJ test has a high intratrial reproducibility in T1 and T2 measured through intraclass correlation coefficient (ICC ≥ 0.95). The ICC for the SJ test had a high value (0.99) only in T1. The variability for both tests among children under 9 years of age is higher than those reported for adult subjects in other studies. The intersession reliability was questionable with a high methodical error (ME= 9.86-15.1%, for the SJ and CMJ, respectively) and a significant worsening of the results of CMJ in T2 (p < .05).

Role of Vertical Jumps and Anthropometric Variables in Maximal Kicking Ball Velocities in Elite Soccer Players

“…No familiarization sessions were conducted in previous studies (Juárez et al, 2008, 2010; Sousa et al, 2003). It is possible that the lack of familiarization sessions could increase the intra-subject variability (Acero et al, 2011), affecting the correlation analysis. In addition, the sample used in previous studies was very small, the soccer players were non-elite and under 15 years old (Juárez et al, 2008).…”

“…Four familiarization sessions were conducted where subjects practiced maximal kicking and jump tests, in order to minimize any learning or habituation effects. For vertical jumps we followed the procedure described by Acero et al (2011). To avoid inter-observer variability, the same experienced investigator tested all subjects.…”

Effects of Ramadan on physical capacities of North African boys fasting for the first time

“…At the end of the 6MWT, the 6MWD in meters (m) was noted and expressed as a percentage of the predicted local reference values (14): 6MWD (m)=4.63×height (cm) − 3.53×BM (kg)+10.42×age (years)+56.32. All tests have been shown to be valid and reproducible (24–27). …”

“…Prior to actual measurements, boys were familiarised with all the study tests to optimise their performance while minimising the learning effect (24–27). Furthermore, they did not perform any strenuous physical activity (sport session at school, nor any other intense effort), 24 h before each testing period.…”

The validity and reliability of an iPhone app for measuring vertical jump performance

“…Vertical jump tests are amongst the most common means of evaluating physical fitness in various populations (Buchheit, Spencer, & Ahmaidi, 2010;de Villarreal, Izquierdo, & Gonzalez-Badillo, 2011;Rodacki, Fowler, & Bennett, 2002;Taipale, Mikkola, Vesterinen, Nummela, & Häkkinen, 2013). Though principally used to evaluate leg power in sports such as basketball and football (Argus, Gill, Keogh, Hopkins, & Beaven, 2009;Duncan, Lyons, & Nevill, 2008;Hartman, Clark, Bemben, Kilgore, & Bemben, 2007), vertical jump tests have also been used to evaluate non-athletic populations (including children (Acero et al, 2011) and elderly people (Pereira et al, 2012)), particularly since vertical jump training has been reported to improve bonemineral density (Allison, Folland, Rennie, Summers, & Brooke-Wavell, 2013).…”