Livingstone M B, Robson P J, Totton M
Northern Ireland Centre for Diet and Health, University of Ulster, Coleraine, Co. Londonderry.
Med Sci Sports Exerc. 2000 Aug;32(8):1513-9. doi: 10.1097/00005768-200008000-00022.
To evaluate the impact of applying seven calibration equations (CE) in the estimation of free-living total energy expenditure (TEE) over 2-3 d in seven boys (mean +/- SD age 9.4+/-0.4 yr) by the Flex heart rate (HR) method.
HR and oxygen consumption were measured simultaneously for eight activities (lying, sitting, standing, arm-reaching exercise, a stooping-and-twisting exercise, stepping, treadmill walking/running, and cycle ergometry) carried out in sequence. CE were derived from various combinations of activities. Flex HRs were identified for each CE.
There were no significant differences in TEE estimates [range (mean +/- SD); 6.65+/-0.72 to 7.27+/-0.89 MJ x d(-1)] derived from any of the CE. Mean daytime HR ranged from 86+/-4 to 122+/-15 beats x min(-1), and 82-98% of recorded daytime HR was < or = 140 beats x min(-1). As a result, within-subject CV in TEE from each of the CE ranged from 2.2% to 8.9%. Mean between-subject Flex HR ranged from 94+/-8 to 111+/-8 beats x min(-1). No significant differences were observed in corresponding TEE estimates. However, mean activity energy expenditure (AEE) ranged from 2.10+/-1.18 MJ x d(-1) (based on Flex HR 111+/-8 beats-min(-1)) to 3.55+/-1.44 MJ x d(-1) (based on Flex HR 94+/-8 beats x min(-1); NS). The corresponding estimates of resting energy expenditure (REE) were 1.89+/-0.82 MJ x d(-1) (Flex HR 111+/-8 beats-min(-1)) and 1.05+/-0.60 MJ x d(-1) (Flex HR 94+/-8 beats x min(-1)). Only the differences between the minimum and maximum estimates of REE were significant (P < 0.05).
Unduly lengthy and complex calibration procedures for the estimation of Flex HR TEE may not be justified in most cases, particularly in sedentary children.
通过Flex心率（HR）法评估应用7种校准方程（CE）对7名男孩（平均±标准差年龄9.4±0.4岁）2 - 3天自由生活总能量消耗（TEE）估计值的影响。
依次对8种活动（躺、坐、站、伸手运动、弯腰扭转运动、踏步、跑步机行走/跑步和自行车测力计运动）同时测量HR和耗氧量。CE由活动的各种组合得出。为每个CE确定Flex HR。
源自任何CE的TEE估计值[范围（平均±标准差）；6.65±0.72至7.27±0.89 MJ×d⁻¹]无显著差异。白天平均HR范围为86±4至122±15次/分钟，记录的白天HR的82 - 98%≤140次/分钟。因此，每个CE的TEE受试者内变异系数范围为2.2%至8.9%。受试者间平均Flex HR范围为94±8至111±8次/分钟。相应的TEE估计值未观察到显著差异。然而，平均活动能量消耗（AEE）范围为2.10±1.18 MJ×d⁻¹（基于Flex HR 111±8次/分钟）至3.55±1.44 MJ×d⁻¹（基于Flex HR 94±8次/分钟；无显著性差异）。相应的静息能量消耗（REE）估计值为1.89±0.82 MJ×d⁻¹（Flex HR 111±8次/分钟）和1.05±0.60 MJ×d⁻¹（Flex HR 94±8次/分钟）。仅REE的最小值和最大值估计值之间的差异具有显著性（P < 0.05）。
在大多数情况下，尤其是对久坐不动的儿童，用于估计Flex HR TEE的校准程序过长且复杂可能不合理。
