Faculty of Kinesiology, University of Zagreb, Zagreb, Croatia.
Research Unit, Motus Melior Ltd., Zagreb, Croatia.
J Strength Cond Res. 2020 Mar;34(3):800-807. doi: 10.1519/JSC.0000000000002800.
Markovic, G, Sarabon, N, Boban, F, Zoric, I, Jelcic, M, Sos, K, and Scappaticci, M. Nordic hamstring strength of highly trained youth football players and its relation to sprint performance. J Strength Cond Res 34(3): 800-807, 2020-We aimed to characterize Nordic hamstring (NH) strength and bilateral NH strength asymmetry in highly trained youth footballers and to investigate the relationship between NH strength and sprint performance. Twenty-two adult and 133 highly trained youth footballers in the age groups U12-U18 participated in this study. Eccentric hamstring strength was assessed using the NH device. Youth footballers (n = 119) also performed 20-m sprint test. Age-related changes in absolute and relative NH strength, and bilateral NH strength asymmetry were analyzed using 1-way analysis of variance. The linear relationship between relative NH strength and sprint performance was established using a Pearson correlation analysis. Significant age-related increases (F = 3.6-18.9; all p < 0.01) in NH strength were reported for all units except N·kg (F = 1.9; p = 0.08). The largest differences in absolute NH strength were seen between U15 and U16 groups. Bilateral NH strength asymmetry varied from 8 to 16% (F = 1.8; p = 0.09) across all age groups. A large correlation between NH strength and sprint performance was observed (r = -0.52; p < 0.01). Our results indicate that NH strength increases nonlinearly with players' age, with the highest values observed in U16 group. Furthermore, bilateral NH strength asymmetry varied nonsignificantly between 8 and 16%. Finally, 27% of variance of sprint performance of youth footballers could be explained by relative NH strength. The reported NH strength data could be used as normative standards during testing and training of youth football players. Present results also suggest that coaches should pay close attention to eccentric hamstring function in youth footballers.
马尔科维奇、G、萨拉邦、N、博班、F、佐里奇、I、耶尔西奇、M、索斯、K 和斯卡拉皮奇、M. 高度训练的青年足球运动员的北欧腘绳肌力量及其与冲刺表现的关系。J 力量与条件研究 34(3):800-807,2020-我们旨在描述高度训练的青年足球运动员的北欧腘绳肌(NH)力量和双侧 NH 力量不对称，并探讨 NH 力量与冲刺表现之间的关系。22 名成年和 133 名年龄在 U12-U18 组的高度训练的青年足球运动员参加了这项研究。使用 NH 装置评估离心腘绳肌力量。青年足球运动员(n = 119)还进行了 20 米冲刺测试。使用单向方差分析分析绝对和相对 NH 力量以及双侧 NH 力量不对称的年龄相关变化。使用皮尔逊相关分析建立相对 NH 力量与冲刺表现之间的线性关系。报告称，所有单位(除 N·kg 外，F = 1.9;p = 0.08)的 NH 强度均与年龄相关显著增加(F = 3.6-18.9;均 p < 0.01)。绝对 NH 强度的最大差异见于 U15 和 U16 组之间。双侧 NH 力量不对称在所有年龄组之间变化 8-16%(F = 1.8;p = 0.09)。NH 力量与冲刺表现之间存在很强的相关性(r = -0.52;p < 0.01)。我们的结果表明，NH 强度随运动员年龄呈非线性增加，U16 组的数值最高。此外，双侧 NH 力量不对称在 8-16%之间变化不显著。最后，青年足球运动员冲刺表现的 27%可以用相对 NH 力量来解释。报告的 NH 强度数据可在对青年足球运动员进行测试和训练时用作参考标准。目前的结果还表明，教练应密切关注青年足球运动员的离心腘绳肌功能。
