Division of Movement and Training Sciences/Biomechanics of Sport, University of Duisburg-Essen, Essen, Germany.
Department of Health and Social Affairs, FHM Bielefeld - University of Applied Sciences, Bielefeld, Germany.
Gait Posture. 2020 Jul;80:148-154. doi: 10.1016/j.gaitpost.2020.05.041. Epub 2020 Jun 1.
The Lower Quarter Y Balance Test (YBT-LQ) has been widely used to register dynamic balance performance in children and adolescents. However, studies evaluating age- and sex-specific normative data to assess and classify YBT-LQ performance for these age-cohorts are missing.
Thus, we investigated YBT-LQ performance in healthy youth to provide age- and sex-specific reference values.
Six-hundred and sixty-nine individuals (286 female, 383 male) aged 10-17 years performed the YBT-LQ with their left and right leg. Normalized maximal reach distances (% leg length) for all three directions (i.e., anterior, posterolateral, posteromedial) and the composite score were calculated. Further, age- and sex-specific percentile values (i.e., 10th to 90th percentile) were computed and plotted.
In boys, the oldest age group (16-17 years) performed better than the younger ones (14-15, 12-13, and 10-11 years). In girls, the youngest age group (10-11 years) often achieved better values compared to the 12-13-year olds. Further, 16-17-year old boys compared to the same aged girls showed better YBT-LQ performance in all but one measure (except left leg reach in posterolateral direction). For both sexes, curvilinear shaped curves were detected for percentile values across the reach directions.
The generated age- and sex-specific reference values for the YBT-LQ can be used by practitioners to evaluate dynamic balance performance in healthy youth aged 10-17 years.
下四分位 Y 平衡测试（YBT-LQ）已广泛用于记录儿童和青少年的动态平衡表现。然而，评估这些年龄组的特定年龄和性别正常数据以评估和分类 YBT-LQ 表现的研究仍然缺乏。
因此，我们调查了健康青少年的 YBT-LQ 表现，以提供特定年龄和性别的参考值。
669 名年龄在 10-17 岁的个体（286 名女性，383 名男性）分别用左腿和右腿进行 YBT-LQ 测试。计算所有三个方向（前、后外侧、后内侧）的最大伸展距离（% 腿长）的归一化值和综合得分。此外，还计算并绘制了特定年龄和性别的百分位数值（即第 10 至第 90 百分位）。
在男孩中，年龄最大的组（16-17 岁）的表现优于年龄较小的组（14-15 岁、12-13 岁和 10-11 岁）。在女孩中，年龄最小的组（10-11 岁）通常比 12-13 岁的女孩表现出更好的 YBT-LQ 成绩。此外，16-17 岁的男孩与同龄女孩相比，除了左腿在后外侧方向的伸展距离外，在所有其他测试中都表现出更好的 YBT-LQ 成绩。对于两性而言，在所有伸展方向上，百分位数值都呈现出曲线形状。
为 YBT-LQ 生成的特定年龄和性别参考值可由从业者用于评估 10-17 岁健康青少年的动态平衡表现。
