08 Články v časopisoch

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Prehliadanie 08 Články v časopisoch podľa Predmet "asymetria"

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  • Obrázok miniatúry
    Položka
    Occurrence of lower limb asymetries during deceleration in soccer players in the U19 category
    (Univerzita Mateja Bela, Filozofická fakulta : Banská Bystrica, 2024) Karabín, Lukáš; Pupiš, Martin; Švantner, Roman
    Objective: The main aim of the study was to identify asymmetries between the dominant and non-dominant lower limb during horizontal deceleration in youth soccer players playing at different playing positions. The research sample consisted of players of the Slovak Football Federation academies in the U19 age category (n=228). We tested the horizontal deceleration of the players by 15-0-5 change-of-direction test, which was performed on a 1080 Sprint adjustable motorized resistance device (1080 Motion, Lidingö, Sweden). For statistical analysis, we used descriptive statistics methods, Shapiro-wilk test for normality of data distribution, one-factor ANOVA test, paired t-test, and Cohen's d to determine the effect size. We did not observe statistically significant asymmetries between players at each player position (forwards, wide midfielders, central midfielders, full backs, central defenders) during deceleration for dominant and non-dominant lower limbs. However, we observed the highest level of deceleration in the full backs, also for dominant (mean = 8.30 m/s² ± 0.82 m/s²) and non-dominant (mean = 8.28 m/s² ± 0.78 m/s²) lower limb. We observed the highest level of deceleration in the full backs, who are characterized by the highest number of decelerations in the game, precisely due to the frequent transition between phases of the game. These findings are directly applicable to the design of individual training programs with an emphasis on reducing injury incidence and increasing movement efficiency during deceleration.
  • Obrázok miniatúry
    Položka
    The incidence of eccentric and isometric hamstring strength asymmetries among U19 youth elite soccer players in Slovakia
    (Univerzita Mateja Bela, Filozofická fakulta : Banská Bystrica, 2024) Sýkora, Jozef
    Physical preparation in soccer is requiring individualization through regular monitoring the physical abilities of players. When it comes to injury prevention, muscle strength and performance asymmetries detection is reliable way to identify increased risk for injury. The primary objective of this study was to analyze the incidence of eccentric and isometric hamstring strength asymmetries among U19 youth elite soccer players in Slovakia and provide the necessary information for physical coaches to improve the injury prevention training protocols. Two hundred eighty-six players (Age 17.29 ± 0.65 years, Height 180.75 ± 12.27 centimeters, Bodyweight 72.97 ± 6.67 kilograms) from 14 Slovakian soccer academies participated in testing their eccentric and isometric hamstring strength during the September 2023. The results showed very high incidence of eccentric as well as isometric hamstring strength asymmetries, when almost 47% of all players scored above 10 % difference between the lower extremities in one or both tests. More than 34 % of all players (p < 0.01, d = 0.3) achieved above 10 % inter-limb difference in eccentric hamstring strength and 26.22 % of all players (p < 0.01, r = 0.36) scored above 10 % inter-limb difference in isometric hamstring strength. Surprisingly, when it comes about players position the results are inconclusive, since some positions showed significant inter-limb differences in eccentric strength, but not in isometric strength and vice versa. Nevertheless, since above 10 % difference in strength testing is considered as a caution for increased chance for injury in any sport, our results suggest that for the players who scored higher asymmetries the physical training intervention for minimizing the inter-limb strength differences might be helpful as a part of injury prevention strategy. Further research needs to be conducted to confirm our findings. It might be interesting to compare the history of players injuries with their strength performance.