Welsman Jo, Armstrong Neil
Children's Health and Exercise Research Centre, University of Exeter, Exeter, Devon, UK.
BMJ Open Sport Exerc Med. 2019 Dec 22;5(1):e000627. doi: 10.1136/bmjsem-2019-000627. eCollection 2019.
The 20 m shuttle run test (20mSRT) is used to estimate cardiorespiratory fitness (CRF) through the prediction of peak oxygen uptake ( ), but its validity as a measure of CRF during childhood and adolescence is questionable. This study examined the validity of the 20mSRT to predict peak .
Peak was measured during treadmill running. Log-linear regression was used to correct peak for body mass and sum of skinfolds plus age. Boys completed the 20mSRT under standardised conditions. Maximum speed (km/h) was used with age to predict peak using the equation developed by Léger . Validity was examined from linear regression methods and limits of agreement (LoA). Relationships between 20mSRT performance and allometrically adjusted peak , and predicted per cent fat were examined.
The sample comprised 76 boys aged 11-14 years. Predicted and measured mass-related peak (mL/kg/min) shared common variance of 32%. LoA revealed that measured peak ranged from 15% below to 25% above predicted peak . There were no significant relationships (p>0.05) between predicted peak and measured peak adjusted for mass, age and skinfold thicknesses. Adjusted for body mass and age, peak was not significantly related (p>0.05) to 20mSRT final speed but a weak, statistically significant (r=0.24, p<0.05) relationship was found with peak adjusted for mass and fatness. Predicted per cent fat was negatively correlated with 20mSRT speed (r=-0.61, p<0.001).
The 20mSRT reflects fatness rather than CRF and has poor validity grounded in its flawed estimation and interpretation of peak in mL/kg/min.
20米穿梭跑测试（20mSRT）通过预测最大摄氧量（ ）来评估心肺适能（CRF），但其作为儿童和青少年时期CRF测量指标的有效性存在疑问。本研究检验了20mSRT预测最大 的有效性。
在跑步机跑步过程中测量最大 。采用对数线性回归对最大 进行体重、皮褶厚度总和与年龄的校正。男孩们在标准化条件下完成20mSRT。使用勒热尔（Léger）开发的公式，将最大速度（千米/小时）与年龄相结合来预测最大 。通过线性回归方法和一致性界限（LoA）检验有效性。研究了20mSRT表现与经异速生长调整的最大 以及预测体脂百分比之间的关系。
样本包括76名11 - 14岁的男孩。预测的和测量的与体重相关的最大 （毫升/千克/分钟）的共同方差为32%。LoA显示，测量的最大 比预测的最大 低15%至高25%。经体重、年龄和皮褶厚度调整后，预测的最大 与测量的最大 之间无显著关系（p>0.05）。经体重和年龄调整后，最大 与20mSRT最终速度无显著关系（p>0.05），但与经体重和肥胖调整后的最大 存在微弱的统计学显著关系（r = 0.24，p<0.05）。预测的体脂百分比与20mSRT速度呈负相关（r = -0.61，p<0.001）。
20mSRT反映的是肥胖程度而非CRF，并且由于其对以毫升/千克/分钟为单位的最大 的估计和解释存在缺陷，其有效性较差。
