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1 Trends in Sport Sciences

1 2019

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The influence of unilateral jumping asymmetry on acceleration and speed performance, in U10 and U15 groups of youth soccer players

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Michailidis Y. , Pirounakis V. , Savvakis C. , Margonis K. , Metaxas T.

nr 4

Introduction. Soccer players perform many actions with one limb, like stop and turn and kicking a ball. A large number of repetitions could create limb asymmetries. Aim of Study. The aims of the present study were to quantify limb asymmetries from unilateral three kinds of jumps (single-leg countermovement jump – SLCMJ, single-leg long jump – SLLJ, and single-leg triple jump – SLTJ) and examine their effects on acceleration (10 m sprint test) and on speed (20 m sprint test) in two different age groups. Material and Methods. Two groups (U10 (9.9 ± 0.3 yrs) and U15 (14.6 ± 0.8 yrs)) of nineteen youth male soccer players each, performed an SLCMJ, SLLJ, SLTJ, and a 20 m sprint test. A paired samples T-test was used to compare the two limbs. Pearson’s correlations were used to investigate the relationships between limb asymmetries and performance on acceleration and speed. Results. In U10 group, SLCMJ height asymmetry (p < 0.05) showed no association with acceleration and speed. However, SLTJ (p < 0.05) asymmetries were associated with slower acceleration times (p < 0.05). Also, SLLJ asymmetries correlated with a lower speed at the 20 m sprint test (p < 0.05). In U15 group, SLCMJ height asymmetry (p < 0.05) showed no association with acceleration and speed. Conclusions. The results from this study highlight that the SLTJ and SLCMJ could be used for identifying limb asymmetries in U10 and U15, respectively.