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Thomas M. Comyns, Eamonn P. Flanagan, Sean Fleming, Evan Fitzgerald and Damian J. Harper

of an athlete’s stretch-shortening cycle (SSC) capabilities, testing and monitoring this strength quality has been of significant interest to researchers and practitioners for some time. 3 Self-regulated repetitive vertical hopping or continuous rebound jump tests provide a simple and controlled way

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Rafael Martín Acero, Miguel Fernández-del Olmo, José Andrés Sánchez, Xosé Luis Otero, Xavier Aguado and Ferrán A. Rodríguez

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).

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Joel M. Garrett, Stuart R. Graham, Roger G. Eston, Darren J. Burgess, Lachlan J. Garrett, John Jakeman and Kevin Norton

apart during a normal microcycle within an ARF in-season period. Methodology Countermovement Jump Test The CMJ test was performed using previously established protocols 1 with an average of 6 CMJs used for analysis. CMJ performance was obtained for analysis via an optical encoder (GymAware Power Tool

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Kim Hébert-Losier, Kurt Jensen and Hans-Christer Holmberg

Purpose:

Jumping and hopping are used to measure lower-body muscle power, stiffness, and stretch-shortening-cycle utilization in sports, with several studies reporting correlations between such measures and sprinting and/or running abilities in athletes. Neither jumping and hopping nor correlations with sprinting and/or running have been examined in orienteering athletes.

Methods:

The authors investigated squat jump (SJ), countermovement jump (CMJ), standing long jump (SLJ), and hopping performed by 8 elite and 8 amateur male foot-orienteering athletes (29 ± 7 y, 183 ± 5 cm, 73 ± 7 kg) and possible correlations to road, path, and forest running and sprinting performance, as well as running economy, velocity at anaerobic threshold, and peak oxygen uptake (VO2peak) from treadmill assessments.

Results:

During SJs and CMJs, elites demonstrated superior relative peak forces, times to peak force, and prestretch augmentation, albeit lower SJ heights and peak powers. Between-groups differences were unclear for CMJ heights, hopping stiffness, and most SLJ parameters. Large pairwise correlations were observed between relative peak and time to peak forces and sprinting velocities; time to peak forces and running velocities; and prestretch augmentation and forest-running velocities. Prestretch augmentation and time to peak forces were moderately correlated to VO2peak. Correlations between running economy and jumping or hopping were small or trivial.

Conclusions:

Overall, the elites exhibited superior stretch-shortening-cycle utilization and rapid generation of high relative maximal forces, especially vertically. These functional measures were more closely related to sprinting and/or running abilities, indicating benefits of lower-body training in orienteering.

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Raúl Reina, Aitor Iturricastillo, Rafael Sabido, Maria Campayo-Piernas and Javier Yanci

palsy (FPCP), 16 – 28 not much is known about VJ capacity, 11 , 16 and we have not found any studies that analyze HJ capacity in this population. FPCP therefore constitute an interesting population for the study of VJ and HJ capacity. It has been reported that in able-bodied football, jump test

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Oliver Gonzalo-Skok, Alejandro Moreno-Azze, José Luis Arjol-Serrano, Julio Tous-Fajardo and Chris Bishop

, such leg was defined as the weaker leg). Tests were performed 2 weeks and 1 week (reliability analysis) before training and 1 week after the training period. Tests included a single-leg horizontal jump test, a triple single-leg horizontal jump test, and unilateral and bilateral CMJ tests. Furthermore

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Filip Sabol, Jozo Grgic and Pavle Mikulic

test of upper-body performance) but not the vertical jump height (a test of lower-body performance). By contrast, Martinez et al 4 reported that a caffeine-containing preworkout supplement did not enhance performance in the medicine ball throw test and the vertical jump test. The caffeine dose in the

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Aaron T. Scanlan, Neal Wen, Joshua H. Guy, Nathan Elsworthy, Michele Lastella, David B. Pyne, Daniele Conte and Vincent J. Dalbo

measures derived from the IMTP with sprinting and jumping tests commonly used in adolescent basketball. There is a paucity of research examining the IMTP in adolescent basketball players. 5 To date, only correlations between dominant:nondominant ratios in normalized peak force production using unilateral

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Jade A.Z. Haycraft, Stephanie Kovalchik, David B. Pyne and Sam Robertson

rank correlation coefficient ( p ). Data are presented with 95% confidence intervals. AAA indicates Athletic Abilities Assessment; AFL, Australian Football League; MSFT, multistage fitness test; U, under; VJ, vertical jump. Jump Tests The relationship between VJ and all match activity measures did not

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Yassine Negra, Helmi Chaabene, Senda Sammoud, Olaf Prieske, Jason Moran, Rodrigo Ramirez-Campillo, Ali Nejmaoui and Urs Granacher

players. However, technical competency must first be attained before the progression to loaded PJT formats. Jumping Tests Jump performance has been shown to be a valid talent identification marker that can discriminate between potential elite and nonelite youth soccer players. 32 In this study, both PJT