McMurray R G, Guion W K, Ainsworth B E, Harrell J S
Department of Physical Education Exercise and Sport Science, University of North Carolina, Chapel Hill 27599-8700, USA.
J Sports Med Phys Fitness. 1998 Sep;38(3):227-33.
To compare the accuracy of two equations for predicting VO2max of children using submaximal cycle ergometry.
Repeated measures comparing treadmill measured maximal aerobic power (VO2max) with two methods of predicting VO2max using cycle ergometry testing.
Thirty-three children (15 boys and 18 girls) aged 7-13 years served as subjects.
Each child completed a treadmill graded exercise test (GXT) to volitional fatigue to assess VO2max. Each child also completed a progressive 9-min, three-stage, submaximal cycle ergometer test. Heart rates obtained during the last minute of each stage of the ergometer test were used to predict VO2max. Predictions were based on a gender-specific modification of the PWC170 (PWCGS) and a modification of the PWC195 using a 1.17 correction factor and an age and gender-adjusted estimate of resting metabolic rate.
The correlations between both submaximal tests and the GXT were significant (p < 0.001); however, the correlation between the GXT and the PWC195 equation (r = 0.807) was higher than the correlation between the GXT and the PWCGS equation (r = 0.658). Analysis indicated that the PWCGS equation significantly underestimated the VO2max compared to either the GXT or PWC195 (GXT = 45.0 +/- 7.1, PWC195 = 44.7 +/- 6.2, PWCGS = 42.7 +/- 5.8 ml/kg/min; p < 0.01).
These results suggest that although the gender-specific PWCGS method is easier to compute and may be acceptable, the modified PWC195 method is a more accurate estimate of VO2max in children.
比较两种通过次极量蹬车运动来预测儿童最大摄氧量（VO2max）的公式的准确性。
采用重复测量设计，将跑步机测量的最大有氧功率（VO2max）与两种通过蹬车运动测试预测VO2max的方法进行比较。
33名7至13岁的儿童（15名男孩和18名女孩）作为研究对象。
每个儿童完成一次跑步机分级运动试验（GXT）直至自愿疲劳，以评估VO2max。每个儿童还完成了一次9分钟的渐进式、三阶段次极量蹬车测力计测试。在测力计测试每个阶段的最后一分钟测得的心率用于预测VO2max。预测基于对PWC170（PWCGS）的性别特异性修正以及使用1.17校正因子和年龄及性别调整后的静息代谢率估计值对PWC195进行的修正。
两次次极量测试与GXT之间的相关性均显著（p < 0.001）；然而，GXT与PWC195公式之间的相关性（r = 0.807）高于GXT与PWCGS公式之间的相关性（r = 0.658）。分析表明，与GXT或PWC195相比，PWCGS公式显著低估了VO2max（GXT = 45.0 +/- 7.1，PWC195 = 44.7 +/- 6.2，PWCGS = 42.7 +/- 5.8 ml/kg/min；p < 0.01）。
这些结果表明，尽管性别特异性PWCGS方法计算更简便且可能可以接受，但修正后的PWC195方法对儿童VO2max的估计更准确。
