Wickel E E, Eisenmann J C
Department of Health and Human Performance, Iowa State University, Ames, IA 50010, USA.
Eur J Clin Nutr. 2006 Apr;60(4):538-44. doi: 10.1038/sj.ejcn.1602348.
To examine the within- and between-individual variability in the estimated total energy expenditure (TEE) and habitual physical activity (PA) in free-living young adults. We were specifically interested in the day-to-day variation.
Cross-sectional.
University.
A total of 277 (125 males, 152 females) participants aged 18-24 years.
None.
Subjects recorded their daily PA with the Bouchard 3-day diary. Descriptive statistics for TEE, moderate-to-vigorous physical activity (MVPA), inactivity (IA), and activity energy expenditure (AEE) were calculated and presented as a frequency distribution. Within- and between-individual variability were tested by RMANOVA and also presented as the coefficient of variation (CV).
Mean values for TEE, MVPA, AEE, and IA were comparable between males and females; however, considerable between-individual variability existed. Only MVPA showed a significant difference between sexes (P<0.05), due to slightly greater vigorous PA in males compared to females (8.0 and 6.8 kcal/kg/day, respectively; P=0.12). Results from the RMANOVA revealed no significant day-to-day variability in any TEE or PA variable and the CVs were not significantly different between males and females. TEE and IA displayed mean CVs of approximately 12% while mean CVs for AEE and MVPA approximated 32 and 84%, respectively.
Results from this study suggest (1) a limited day-to-day variability in TEE and (2) a large degree of between-individual variation for TEE and PA exist. This study highlights the importance of understanding the variability associated with TEE, which is important for PA measurement and proper PA and nutritional recommendations.
None.
研究自由生活的年轻成年人估计的总能量消耗（TEE）和习惯性身体活动（PA）的个体内及个体间变异性。我们特别关注日常变化情况。
横断面研究。
大学。
共有277名年龄在18 - 24岁的参与者（125名男性，152名女性）。
无。
受试者使用布沙尔3天日记记录其每日的身体活动。计算TEE、中度至剧烈身体活动（MVPA）、不活动时间（IA）和活动能量消耗（AEE）的描述性统计数据，并以频率分布形式呈现。通过重复测量方差分析（RMANOVA）检验个体内及个体间变异性，并以变异系数（CV）表示。
男性和女性在TEE、MVPA、AEE和IA的平均值上具有可比性；然而，个体间存在相当大的变异性。只有MVPA在性别之间显示出显著差异（P<0.05），这是由于男性的剧烈身体活动略多于女性（分别为8.0和6.8千卡/千克/天；P = 0.12）。重复测量方差分析的结果显示，任何TEE或PA变量均无显著的日常变异性，且男性和女性之间的变异系数无显著差异。TEE和IA的平均变异系数约为12%，而AEE和MVPA的平均变异系数分别约为32%和84%。
本研究结果表明：（1）TEE的日常变异性有限；（2）TEE和PA存在很大程度的个体间差异。本研究强调了理解与TEE相关变异性的重要性，这对于身体活动测量以及适当的身体活动和营养建议至关重要。
无。
