Effects of moderate-to-heavy sled training using different magnitudes of velocity loss in professional soccer players

Document Type

Journal Article

Publication Title

Journal of strength and conditioning research

PubMed ID

33009351

Publisher

National Strength and Conditioning Association

School

Exercise Medicine Research Institute / School of Medical and Health Sciences

RAS ID

56509

Comments

Grazioli, R., Loturco, I., Lopez, P., Setuain, I., Goulart, J., Veeck, F., ... & Cadore, E. L. (2020). Effects of moderate-to-heavy sled training using different magnitudes of velocity loss in professional soccer players. Journal of Strength and Conditioning Research, 37(3), 629-635. https://doi.org/10.1519/JSC.0000000000003813

Abstract

This study investigated the effects of a 11-week moderate-to-heavy sled training intervention with different magnitudes of velocity loss on sprint and jump performance, mechanical muscle function, and body composition in professional soccer players. Seventeen players (age 25.8 ± 4.3 years; height 180.0 ± 8.6 cm; weight 77.7 ± 9.7 kg) were randomly allocated into 2 groups, based on different magnitudes of velocity loss: 10% of velocity decrease (G10, n = 8) and 20% of velocity decrease (G20, n = 9). The velocity-based sled training consisted of 20-m resisted sprints with a progressive loading increase from 45 to 65% of body-mass throughout the intervention. Pre-intervention and postintervention sprint and jump performance, hamstring and quadriceps peak torque and isometric rate of torque development, and lower-limb lean mass measured by dual X-ray absorptiometry were assessed and compared. Two-way repeated measures analysis of variance revealed a significant time-effect for decreases in 10- and 20-m sprint times (p = 0.018 and p = 0.033, respectively), but without a time-group interaction. The G10 showed greater beneficial effects than G20 for both 10-m (-5.5 ± 3.3%, magnitude-based inference [MBI]: possibly vs. -1.7 ± 5.9%, MBI: possibly trivial) and 20-m (-2.5 ± 2.1%, MBI: possibly vs. -1.4 ± 3.7%, MBI: likely trivial) sprint times. Moreover, there was a significant time effect for countermovement jump height and quadriceps isometric peak torque, which decreased significantly after training (p = 0.019 and p = 0.010, respectively), with no within-group effect of time vs. group interaction for these respective outcomes. The novel velocity-based sled model proposed here, especially under lower magnitudes of velocity loss, was able to significantly improve linear sprint performance in professional soccer players.

DOI

10.1519/JSC.0000000000003813

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