Lee Eun-Young, Barnes Joel D, Lang Justin J, Silva Diego A S, Tomkinson Grant R, Tremblay Mark S
School of Kinesiology and Health Studies, Queen's University, Kingston, ON K7L2N9, Canada.
Healthy Active Living and Obesity (HALO) Research Group, CHEO Research Institute, Ottawa, ON K1H 8L1, Canada.
J Exerc Sci Fit. 2020 Sep;18(3):129-135. doi: 10.1016/j.jesf.2020.04.002. Epub 2020 May 10.
This study examined the validity of the FitnessGram® criterion-reference cut-points for cardiorespiratory fitness (CRF) based on two samples of US adolescents (aged 12-15 years). This study also established the CRF cut-points for metabolically healthy weight status based on a recent national fitness survey for the purposes of cross-validating with pre-existing cut-points including FitnessGram.
Two cross-sectional data from the 2003-2004 National Health and Nutrition Examination Survey (NHANES) (n = 378) and 2012 NHANES National Youth Fitness Survey (NNYFS) (n = 451) were used. CRF (estimated O in mL/kg/min) was estimated from a submaximal exercise test. CRF categories based on FitnessGram cut-points, a clustered cardiometabolic risk factors score and weight status were used. A series of Receiver Operating Characteristic (ROC) curve analyses were conducted to identify age- and sex-specific CRF cut-points that were optimal for metabolically healthy weight status.
Based on FitnessGram cut-points, having high risk CRF, but not low risk CRF, was associated with high cardiometabolic risk (OR = 3.17, 95% CI = 1.14-8.79) and unhealthy weight status (OR = 5.81, 95% CI = 3.49-9.68). The optimal CRF cut-points for 12-13-year-olds and 14-15-year-olds were 40 and 43 mL/kg/min in males and 39 and 34 mL/kg/min in females, respectively. Compared to meeting new CRF cut-points, not meeting new CRF cut-points was associated with higher odds of showing high cardiometabolic risk (OR = 2.91, 95% CI = 1.47-5.77) and metabolically unhealthy weight status (OR = 4.47, 95% CI = 2.83-7.05).
FitnessGram CRF cut-point itself has rarely been scrutinized in previous literature. Our findings provide partial support for FitnessGram based on two samples of US adolescents. CRF cut-points established in this study supports international criterion-referenced cut-points as well as FitnessGram cut-points only for males. FitnessGram should be continuously monitored and scrutinized using different samples.
本研究基于美国青少年（12 - 15岁）的两个样本，检验了FitnessGram®心肺适能（CRF）标准参照切点的有效性。本研究还基于最近的一项全国健身调查，确定了代谢健康体重状况的CRF切点，以便与包括FitnessGram在内的现有切点进行交叉验证。
使用了2003 - 2004年国家健康与营养检查调查（NHANES）（n = 378）和2012年NHANES全国青少年健身调查（NNYFS）（n = 451）的两个横断面数据。CRF（以毫升/千克/分钟估算）通过次极量运动试验估算。使用基于FitnessGram切点、聚集性心脏代谢风险因素评分和体重状况的CRF类别。进行了一系列受试者工作特征（ROC）曲线分析，以确定对代谢健康体重状况最优的年龄和性别特异性CRF切点。
基于FitnessGram切点，具有高风险CRF而非低风险CRF，与高心脏代谢风险（OR = 3.17，95%CI = 1.14 - 8.79）和不健康体重状况（OR = 5.81，95%CI = 3.49 - 9.68）相关。12 - 13岁男性和14 - 15岁男性的最优CRF切点分别为40和43毫升/千克/分钟，12 - 13岁女性和14 - 15岁女性的最优CRF切点分别为39和34毫升/千克/分钟。与达到新的CRF切点相比未达到新的CRF切点，与显示高心脏代谢风险（OR = 2.91，95%CI = 1.47 - 5.77）和代谢不健康体重状况（OR = 4.47，95%CI = 2.83 - 7.05）的较高几率相关。
FitnessGram CRF切点本身在以往文献中很少受到审视。我们的研究结果基于美国青少年的两个样本为FitnessGram提供了部分支持。本研究确定的CRF切点支持国际标准参照切点以及仅针对男性的FitnessGram切点。应使用不同样本持续监测和审视FitnessGram。
