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. 2015 Nov 24;10(11):e0143323.
doi: 10.1371/journal.pone.0143323. eCollection 2015.

Analysis of Jumping-Landing Manoeuvers after Different Speed Performances in Soccer Players

Abdolhamid Daneshjoo  1 , Noor Azuan Abu Osman  2 , Mansour Sahebozamani  1 , Ashril Yusof  3
Affiliations

Analysis of Jumping-Landing Manoeuvers after Different Speed Performances in Soccer Players

Abdolhamid Daneshjoo et al. PLoS One. .

Erratum in

Abstract

Purpose: Running at high speed and sudden change in direction or activity stresses the knee. Surprisingly, not many studies have investigated the effects of sprinting on knee's kinetics and kinematics of soccer players. Hence, this study is aimed to investigate indices of injury risk factors of jumping-landing maneuvers performed immediately after sprinting in male soccer players.

Methods: Twenty-three collegiate male soccer players (22.1±1.7 years) were tested in four conditions; vertical jump (VJ), vertical jump immediately after slow running (VJSR), vertical jump immediately after sprinting (VJFR) and double horizontal jump immediately after sprinting (HJFR). The kinematics and kinetics data were measured using Vicon motion analyzer (100Hz) and two Kistler force platforms (1000Hz), respectively.

Results: For knee flexion joint angle, (p = 0.014, η = 0.15) and knee valgus moment (p = 0.001, η = 0.71) differences between condition in the landing phase were found. For knee valgus joint angle, a main effect between legs in the jumping phase was found (p = 0.006, η = 0.31), which suggests bilateral deficit existed between the right and left lower limbs.

Conclusion: In brief, the important findings were greater knee valgus moment and less knee flexion joint angle proceeding sprint (HJFR & VJFR) rather than no sprint condition (VJ) present an increased risk for knee injuries. These results seem to suggest that running and sudden subsequent jumping-landing activity experienced during playing soccer may negatively change the knee valgus moment. Thus, sprinting preceding a jump task may increase knee risk factors such as moment and knee flexion joint angle.

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Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Fig 1
Fig 1. Vertical jumping and landing after 10 m slow and fast run.
The subjects run 10m at speed below (VJSR) and above their average speed (VJFR) and perform a vertical jumping and landing while was on the force plate.
Fig 2
Fig 2. Double horizontal jump after 10m run (HJFR).
The subjects run 10m and carried out double horizontal jump before reaching the force plate and landed on the force plates.
See this image and copyright information in PMC

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