成熟段階は若いサッカー選手の方向転換の非対称性に影響しない

Maturation Stage Does Not Affect Change of Direction Asymmetries in Young Soccer Players.

抄録

Asimakidis, ND, Dalamitros, AA, Ribeiro, J, Lola, AC, and Manou, V. Μaturation stage does not affect change of direction asymmetries in young soccer players.J Strength Cond Res 36(12)：3440-3445, 2022-本研究では、生物学的成熟段階が方向転換（COD）テスト中の手足間の非対称性に影響を与えるかどうかを検討した。76名の若年サッカー選手を、ピーク身長速度段階（PHV）に応じて2群に分けた：PHV前（n＝45、年齢＝11.8±1.2歳、身長＝149.8±9.3cm、体重＝43.9±11.2kg）とポストPHV（n＝31、年齢＝14.4±0.9歳、身長＝170.0±4.9cm、体重＝61.5±8.9kg）である。被験者は、両方向の完走時間を測定する505テストと20m最大スプリントテストを行った。方向転換欠損（CODD）は、COD能力を分離するための指標として用いられた。独立標本t検定の結果、PHV前群とPHV後群を比較した場合、505テスト完了時間の非対称性指標値に有意差は認められなかった（-3.49±2.49％ vs -3.45±2.47％、効果量[ES]=0.02、p=0.923）。同様に、CODD非対称性指数も2群間に差はなかった（-8.21±5.95％ vs -7.37±5.12％、ES = 0.15、p = 0.457）。対の標本t検定の結果、CODD非対称性指数の値は505非対称性指数の値よりも大きかった（-7.88±5.61％対-3.49±2.46％、ES＝1.09、p＜0.001）。これらの結果から、成熟度はCOD能力の手足間非対称性に影響を与えないことがわかった。さらに、CODDの非対称性の値は、505回のテスト完了時間と比較してより大きく、CODの非対称性の評価はCODDに基づくべきであることが補強された。手足間の非対称性は成熟過程では変化しないため、練習者はアスリートの成長過程の早い段階でCOD非対称性の異常に対処すべきである。

Asimakidis, ND, Dalamitros, AA, Ribeiro, J, Lola, AC, and Manou, V. Μaturation stage does not affect change of direction asymmetries in young soccer players. J Strength Cond Res 36(12): 3440-3445, 2022-This study examined whether the stage of biological maturation can affect interlimb asymmetries during a change of direction (COD) test. Seventy-six young soccer players were divided into 2 different groups according to their peak height velocity stage (PHV): pre-PHV (n = 45, age = 11.8 ± 1.2 years, height = 149.8 ± 9.3 cm, body mass = 43.9 ± 11.2 kg) and post-PHV (n = 31, age = 14.4 ± 0.9 years, height = 170.0 ± 4.9 cm, body mass = 61.5 ± 8.9 kg). Subjects performed a 505 test to measure the completion time in both directions and a 20-m maximum sprint test. Change of direction deficit (CODD) was used as a measure for isolating COD ability. An independent sample t-test detected no significant differences between the asymmetry index values for the 505 test completion time when the pre-PHV group and the post-PHV group were compared (-3.49 ± 2.49% vs. -3.45 ± 2.47%, effect size [ES] = 0.02, p = 0.923). Similarly, the CODD asymmetry index indicated no differences between the 2 groups (-8.21 ± 5.95% vs. -7.37 ± 5.12%, ES = 0.15, p = 0.457). A paired sample t-test revealed that the values of the CODD asymmetry index were larger than those of the 505 asymmetry index (-7.88 ± 5.61% vs. -3.49 ± 2.46%, ES = 1.09, p < 0.001). According to these results, maturational status has no influence on the interlimb asymmetries of COD ability. Furthermore, subjects showed greater asymmetry values in CODD compared with the 505 test completion time, reinforcing that the evaluation of COD asymmetries should be based on CODD. As interlimb asymmetries are not altered during the maturation process, practitioners should address abnormal COD asymmetries early on during athletes' development processes.