Unilateral and Bilateral Muscular Dysbalances of Knee Joint in Junior Tennis Players – Boys and Girls

Kód výsledku v IS VaVaI

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Unilateral and Bilateral Muscular Dysbalances of Knee Joint in Junior Tennis Players – Boys and Girls

Popis výsledku v původním jazyce

Tennis game is typical for high intensity, sudden changes of directions, rapid slow down, acceleration and running for the ball. These movements lead to intensive strain to lower extremities, which is connected with selective activation of muscle groups and their further adaptation. During the muscle adaptation, muscular dysbalances might occur, which can result in an increased incidence of injuries and can be the cause for the reduced ability to maintain a balanced body posture during the game. With regard to this fact, the aim of this study was to establish, the strength level of knee extensors and flexors and assessment of their unilateral and bilateral differences, further to examine the strength level in tennis players group - boys (TEN_M, n=10, aged 13.23 ± 0.51), girls (TEN_F, n=10, aged 13.34 ± 0.69) in comparison with groups of boys (CS_M, n=10, aged 13.04 ± 0.61) and girls (CS_F, n=10, aged 13.21 ± 0.55 let) who do not perform any sport activity. Diagnostics of knee joints strength was carried out by isokinetic dynamometry (Humac Norm CSMI, Stoughton, USA) under two angular velocities (180°/s and 300°/s). Significance of differences in mean values was assessed by using Cohen´s d. Data analysis proved that differences between TEN and CS groups concerning age, body height and weight were insignificant. Comparison of isokinetic strength level (180°/s) between TEN_M and CS_M group proved significantly higher strength level of knee extensors (d=0.75) and flexors (d=1.27) in tennis players dominant extremity. Also for non-dominant leg in TEN_M group, was found significantly higher strength level of extensors (d=0.68) and flexors (d=1.05). Assessment of bilateral differences in strength of knee extensors (d=0.11) and flexors (d=0.05) of dominant and non-dominant extremity in TEN_M group did not prove their significance. Neither in CS_M group was found significant bilateral strength differences between knee extensors (d=0.07) and flexors (d=0.15) of dominant and non-dominant extremity. Comparison of isokinetic strength level (300°/s) between TEN_M and CS_M groups proved significantly higher strength level of knee extensors (d=0.91) and flexors (d=1.48) of dominant extremity in tennis players group. Also in knee extensors (d=0.85) and flexors (d=1.05) of non-dominant extremity, was proved significantly higher strength level in tennis players group. Assessment of bilateral differences in strength of knee extensors (d=0.11) and flexors (d=0.01) of dominant and non-dominant extremity in TEN_M group did not prove their significance. Neither in CS_M group was found significant bilateral strength differences between knee extensors (d=0.10) and flexors (d=0.21) of dominant and non-dominant extremity. Comparison of isokinetic strength level (180°/s) of dominant extremity between TEN_F and CS_F groups did not prove significant differences in the strength of extensors (d=0.46) and flexors (d=0.45). Significant lateral differences in strength level in favour of TEN_F group were however proved in knee extensors (d=0.56) and flexors (d=0.73) on non-dominant extremity. Assessment of bilateral differences in strength of knee extensors (d=0.04) and flexors (d=0.24) of dominant and non-dominant extremity in TEN_F group did not prove their significance. Neither in CS_F group was found significant bilateral strength differences between knee extensors (d=0.12) and flexors (d=0.05) of dominant and non-dominant extremity. Comparison of isokinetic strength level (300°/s) between TEN_F and CS_F group proved significantly higher strength level of knee extensors (d=0.63) of dominant extremity in tennis players group, while the significance of difference was not proved in flexors (d=0.48).

Název v anglickém jazyce

Unilateral and Bilateral Muscular Dysbalances of Knee Joint in Junior Tennis Players – Boys and Girls

Popis výsledku anglicky

Tennis game is typical for high intensity, sudden changes of directions, rapid slow down, acceleration and running for the ball. These movements lead to intensive strain to lower extremities, which is connected with selective activation of muscle groups and their further adaptation. During the muscle adaptation, muscular dysbalances might occur, which can result in an increased incidence of injuries and can be the cause for the reduced ability to maintain a balanced body posture during the game. With regard to this fact, the aim of this study was to establish, the strength level of knee extensors and flexors and assessment of their unilateral and bilateral differences, further to examine the strength level in tennis players group - boys (TEN_M, n=10, aged 13.23 ± 0.51), girls (TEN_F, n=10, aged 13.34 ± 0.69) in comparison with groups of boys (CS_M, n=10, aged 13.04 ± 0.61) and girls (CS_F, n=10, aged 13.21 ± 0.55 let) who do not perform any sport activity. Diagnostics of knee joints strength was carried out by isokinetic dynamometry (Humac Norm CSMI, Stoughton, USA) under two angular velocities (180°/s and 300°/s). Significance of differences in mean values was assessed by using Cohen´s d. Data analysis proved that differences between TEN and CS groups concerning age, body height and weight were insignificant. Comparison of isokinetic strength level (180°/s) between TEN_M and CS_M group proved significantly higher strength level of knee extensors (d=0.75) and flexors (d=1.27) in tennis players dominant extremity. Also for non-dominant leg in TEN_M group, was found significantly higher strength level of extensors (d=0.68) and flexors (d=1.05). Assessment of bilateral differences in strength of knee extensors (d=0.11) and flexors (d=0.05) of dominant and non-dominant extremity in TEN_M group did not prove their significance. Neither in CS_M group was found significant bilateral strength differences between knee extensors (d=0.07) and flexors (d=0.15) of dominant and non-dominant extremity. Comparison of isokinetic strength level (300°/s) between TEN_M and CS_M groups proved significantly higher strength level of knee extensors (d=0.91) and flexors (d=1.48) of dominant extremity in tennis players group. Also in knee extensors (d=0.85) and flexors (d=1.05) of non-dominant extremity, was proved significantly higher strength level in tennis players group. Assessment of bilateral differences in strength of knee extensors (d=0.11) and flexors (d=0.01) of dominant and non-dominant extremity in TEN_M group did not prove their significance. Neither in CS_M group was found significant bilateral strength differences between knee extensors (d=0.10) and flexors (d=0.21) of dominant and non-dominant extremity. Comparison of isokinetic strength level (180°/s) of dominant extremity between TEN_F and CS_F groups did not prove significant differences in the strength of extensors (d=0.46) and flexors (d=0.45). Significant lateral differences in strength level in favour of TEN_F group were however proved in knee extensors (d=0.56) and flexors (d=0.73) on non-dominant extremity. Assessment of bilateral differences in strength of knee extensors (d=0.04) and flexors (d=0.24) of dominant and non-dominant extremity in TEN_F group did not prove their significance. Neither in CS_F group was found significant bilateral strength differences between knee extensors (d=0.12) and flexors (d=0.05) of dominant and non-dominant extremity. Comparison of isokinetic strength level (300°/s) between TEN_F and CS_F group proved significantly higher strength level of knee extensors (d=0.63) of dominant extremity in tennis players group, while the significance of difference was not proved in flexors (d=0.48).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

30306 - Sport and fitness sciences

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

BRAIN. BROAD RESEARCH IN ARTIFICIAL INTELLIGENCE AND NEUROSCIENCE

ISSN

2067-3957

e-ISSN

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Svazek periodika

9

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

RO - Rumunsko

Počet stran výsledku

13

Strana od-do

141-153

Kód UT WoS článku

000451862700013

EID výsledku v databázi Scopus

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