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Relationships Between Vertical Jump and Full Squat Power Outputs With Sprint Times in U21 Soccer Players

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López-Segovia M., Marques M., van den Tillaar R., González-Badillo J.

Journal of Human Kinetics

2011

vol. 30

135-144

The aim of this study was to assess the relationship between power variables in the vertical jump and full squat with the sprint performance in soccer players. Fourteen under-21 soccer players were evaluated in two testing sessions separated by 7 days. In the first testing session, vertical jump height in countermovement was assessed, and power output for both loaded countermovement jump (CMJL) and full squat (FS) exercises in two progressive load tests. The second testing session included sprinting at 10, 20, and 30m (T10, T20, T30, T10-20, T10-30, T20-30). Power variables obtained in the loaded vertical jump with 20kg and full squat exercise with 70kg showed significant relationships with all split times (r=-0.56/-0.79; p≤ 0.01/0.01). The results suggest that power produced either with vertical jump or full squat exercises is an important factor to explain short sprint performance in soccer players. These findings might suggest that certain levels of neuromuscular activation are more related with sprint performance reflecting the greater suitability of loads against others for the improvement of short sprint ability in under-21 soccer players.

Importance of Muscle Power Variables in Repeated and Single Sprint Performance in Soccer Players

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López-Segovia M., Dellal A., Chamari K., González-Badillo J. J.

Journal of Human Kinetics

2014

vol. 40

issue 1

201-211

This study examined the relationship between lower body power and repeated as well as single sprint performance in soccer players. The performance of nineteen male soccer players was examined. The first testing session included the countermovement jump (CMJL) and the progressive full squat (FSL), both with external loads. Power in the CMJL and FSL was measured with each load that was lifted. The second session included a protocol of 40-m repeated sprints with a long recovery period (2 min). The number of sprints executed until there was a 3% decrease in performance for the best 40-m sprint time was recorded as a repeated sprint index (RSI). The RSI was moderately associated with power output relative to body mass in the CMJL and FSL (r = 0.53/0.54, p ≤ 0.05). The most and least powerful players (determined by FSL) showed significant differences in the RSI (9.1 ± 4.2 vs. 6.5 ± 1.6) and 10 m sprint time (p [...] 0.01). Repeated and single sprints are associated with relatively lower body power in soccer players.

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2 Journal of Human Kinetics

1 2014

1 2011

2 López-Segovia M.

1 Chamari K.

1 Dellal A.

1 González-Badillo J.

1 González-Badillo J. J.

1 Marques M.

1 van den Tillaar R.

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Relationships Between Vertical Jump and Full Squat Power Outputs With Sprint Times in U21 Soccer Players

Importance of Muscle Power Variables in Repeated and Single Sprint Performance in Soccer Players