Background

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.

Objective

Thus, we investigated YBT-LQ performance in healthy youth to provide age- and sex-specific reference values.

Methods

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.

Results

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.

Conclusions

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.

中文翻译：

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Y季度下限平衡测试性能：10至17岁健康青年的参考值。

背景

下四季度Y平衡测试（YBT-LQ）已被广泛用于记录儿童和青少年的动态平衡性能。但是，缺少评估针对年龄和性别的规范性数据以评估和分类这些年龄组的YBT-LQ表现的研究。

目的

因此，我们调查了YBT-LQ在健康青年中的表现，以提供针对年龄和性别的参考值。

方法

YBT-LQ的年龄在10-17岁之间，有669例（286名女性，383名男性）左右腿。计算所有三个方向（即前，后外侧，后内侧）的归一化最大到达距离（腿长％）和综合评分。此外，计算并绘制了按年龄和性别划分的百分数值（即第10至90个百分位数）。

结果

在男孩中，年龄最大的年龄段（16-17岁）比年轻人的年龄段（14-15岁，12-13岁和10-11岁）表现更好。在女孩中，最年轻的年龄段（10-11岁）通常比12-13岁的年龄段获得更好的价值。此外，除同等年龄的女孩外，其他年龄段的16-17岁男孩表现出更好的YBT-LQ表现（除了左腿伸入后外侧方向）。对于男女，都检测到曲线形状的曲线以了解到达方向上的百分比值。

结论

从业人员可以使用生成的针对YBT-LQ的特定年龄和性别的参考值来评估10-17岁健康青年的动态平衡表现。