University of North Carolina at Greensboro, Department of Exercise and Sport Science, 250 Health and Human Performance Building, Greensboro, NC 27402, USA.
J Athl Train. 2009 Jan-Feb;44(1):26-32. doi: 10.4085/1062-6050-44.1.26.
Sex differences in dynamic measures have been established in physically mature populations. Gaining information on maturation's effect on dynamic performance measures implicated in injury risk may enable us to better design injury prevention programs.
To examine sex differences in dynamic valgus alignment and triple-hop distance measures across maturational stages in males and females. A secondary purpose was to determine if a field test of strength and power predicts dynamic valgus alignment.
Cross-sectional study.
Laboratory.
157 young athletes (78 females, 79 males) aged 9 to 18 years.
INTERVENTION(S): Subjects performed drop-jump landings and single-leg triple-hop tests as part of a broader injury screening.
MAIN OUTCOME MEASURE(S): Maturational status was ascertained from self-report questionnaires and grouped according to Tanner stages 1 and 2 (MatGrp1), 3 and 4 (MatGrp2), and 5 (MatGrp3). Frontal-plane knee valgus displacement, which served as a measure of dynamic valgus alignment, and single-leg triple-hop distance were assessed.
Males demonstrated less dynamic valgus alignment during drop jumps in the latter maturational stages (MatGrp1 = 13.1 degrees +/- 8.7 degrees , MatGrp2 = 9.0 degrees +/- 6.2 degrees , MatGrp3 = 9.2 degrees +/- 9.4 degrees ), whereas females increased dynamic valgus alignment throughout maturation (MatGrp1 = 11.5 degrees +/- 6.9 degrees , MatGrp2 = 12.8 degrees +/- 8.8 degrees , MatGrp3 = 15.5 degrees +/- 8.7 degrees ). Thus, in the more mature groups, males had less dynamic valgus alignment than females. Both males (MatGrp1 = 393.5 +/- 63.7 cm, MatGrp2 = 491.8 +/- 95.1 cm, MatGrp3 = 559.3 +/- 76.3 cm) and females (MatGrp1 = 360.3 +/- 37.1 cm, MatGrp2 = 380.1 +/- 44.3 cm, MatGrp3 = 440.0 +/- 66.2 cm) increased triple-hop distance, but males increased more. Within each subgroup of MatGrp and sex, triple-hop distance had no predictive ability for dynamic malalignment.
When dynamic valgus alignment and strength were assessed, sex and maturational status displayed an interaction. However, functional strength did not predict degree of dynamic valgus alignment.
在身体成熟的人群中已经确定了动态测量的性别差异。了解成熟对与受伤风险相关的动态表现测量的影响，可能使我们能够更好地设计伤害预防计划。
研究男性和女性在不同成熟阶段的动态外翻对齐和三联跳距离测量中的性别差异。次要目的是确定力量和力量的现场测试是否可以预测动态外翻对齐。
横断面研究。
实验室。
157 名年轻运动员（女性 78 名，男性 79 名），年龄 9 至 18 岁。
受试者进行了跳落式着陆和单腿三联跳测试，作为更广泛的伤害筛查的一部分。
成熟度是通过自我报告问卷确定的，并根据 Tanner 阶段 1 和 2（MatGrp1）、3 和 4（MatGrp2）和 5（MatGrp3）分组。评估了前平面膝关节外翻位移，作为动态外翻对齐的测量指标，以及单腿三联跳距离。
在后期成熟阶段，男性在跳落式着陆时表现出较小的动态外翻对齐（MatGrp1=13.1°±8.7°，MatGrp2=9.0°±6.2°，MatGrp3=9.2°±9.4°），而女性则在整个成熟过程中增加了动态外翻对齐（MatGrp1=11.5°±6.9°，MatGrp2=12.8°±8.8°，MatGrp3=15.5°±8.7°）。因此，在更成熟的组别中，男性的动态外翻对齐程度低于女性。男性（MatGrp1=393.5±63.7cm，MatGrp2=491.8±95.1cm，MatGrp3=559.3±76.3cm）和女性（MatGrp1=360.3±37.1cm，MatGrp2=380.1±44.3cm，MatGrp3=440.0±66.2cm）都增加了三联跳距离，但男性增加的更多。在每个 MatGrp 和性别的亚组中，三联跳距离对动态偏斜均无预测能力。
当评估动态外翻对齐和力量时，性别和成熟状态显示出相互作用。然而，功能力量并不能预测动态外翻对齐的程度。
