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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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Lee N. Burkett, Joana Ziuraitis and Wayne T. Phillips

The effectiveness of two specific and two non-specific warm-ups on the vertical jump test for female athletes was the focus of this research. The four warm-up procedures were: (a) weighted jumping (WT), (b) submaximal vertical jumping (SUB), (c) stretching (ST), and (d) no warm-up (NW). To control for learning and fatigue, a counter-balanced design was used to test all participants over four different days. Thus all groups were tested in a predetermined order. Participants were 15 university female athletes (age 18 to 23 years). After warming up using one of the four warm-up procedures, three vertical jumps were measured and the best score was used for analysis. A single factors repeated measure analysis of variance and LSD post hoc tests revealed that the weighted jump warm-up procedure was statistically superior (p<0.01) to all other warm-up procedures. No warm-up was statistically inferior to all other warm-ups and submaximal vertical jumping was not statistically different than stretching. It was concluded; (a) performing a warmup is better than no warm-up, and (b) utilizing a weighted resistance-jumping warm-up will produce the highest scores when performing the vertical jump test for female athletes.

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

Purpose:

The purpose of this study was to determine the typical variation of variables from a countermovement jump (CMJ) test and a submaximal run test (SRT), along with comparing the sensitivity of each test for the detection of practically important changes within high-performance Australian rules football (ARF) players.

Methods:

23 professional and semi-professional ARF players, performed six CMJs and three, eight-second 50-meter runs every 30 s (SRT), seven days apart. Absolute and trial-to-trial reliability was represented as a coefficient of variation (CV) ± 90% confidence intervals (CI). Test-retest reliability was examined using the magnitude of the difference (effect size (ES) ± 90% CI) from week 1 to week 2. The smallest worthwhile change (SWC) was calculated as 0.25 x SD.

Results:

Good reliability (CVs = 6.6 – 9.3%) was determined for all variables except eccentric displacement (CV = 12.8%), with no clear changes observed in any variables between week 1 and week 2. All variables from the SRT possessed a CV < SWC, indicating an ability to detect practically important changes in performance. Only peak velocity from the CMJ test possessed a CV < SWC, exhibiting a limitation of this test in detecting practically meaningful changes within this environment.

Conclusions:

The results suggest that while all variables possess acceptable reliability, a SRT might offer to be a more sensitive monitoring tool than a CMJ test within high-performance ARF, due to its greater ability for detecting practically important changes in performance.

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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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Haley Bookbinder, Lindsay V. Slater, Austin Simpson, Jay Hertel and Joseph M. Hart

exercise for both the single-leg hop for distance as well as jump height and ground contact time during the 4-jump test. Methods Participants A total of 52 individuals volunteered for this study consisting of 27 patients with ACLR and 25 matched healthy, uninjured controls (Table  1 ). Based on an a priori

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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