Pfeiffer Karin A, Schmitz Kathryn H, McMurray Robert G, Treuth Margarita S, Murray David M, Pate Russell R
Department of Exercise Science, Arnold School of Public Health, University of South Carolina, Columbia, South Carolina 29208, USA.
Am J Prev Med. 2006 Oct;31(4):328-31. doi: 10.1016/j.amepre.2006.06.002. Epub 2006 Aug 28.
Understanding interindividual variability of energy expended in common activities is important for determining precise estimates of energy expenditure in surveillance studies and clinical trials. The purpose of this study was to describe the variability in energy expenditure for selected physical activities among adolescent girls.
Seventy-four adolescent girls (aged 13 to 14 years) participated in this cross-sectional investigation. Data were collected in 2001 and analyzed in 2004. Energy expenditure was measured by indirect calorimetry for ten activities and during a submaximal cycle ergometer test, which was used to estimate cardiorespiratory fitness. Variability in energy expended for the various activities was expressed by standard deviation, coefficient of variation, and range for three different energy expenditure variables: relative VO2 (milliliters per kilogram per minute), absolute VO2 (liters per minute(-1)), and calculated metabolic rate (kilojoules per minute).
Depending on the expression of energy expenditure, coefficients of variation ranged from a low of 13.2% for climbing stairs to a high of 38.4% for playing a computer game. Some lower-intensity activities were associated with greater variability in energy expenditure. Bicycling showed consistently higher coefficients of variation across expressions of energy expenditure (29.1%, 37.7%, and 33.5% for relative VO2, absolute VO2, and calculated metabolic rate, respectively).
Energy expenditure for common activities is highly variable in adolescent girls. The coefficient of variation was higher in some activities of lower intensity, regardless of energy expenditure expression. This variance may influence the evaluation of physical activity interventions, particularly with regard to issues such as a prescribed dose of activity and the statistical power to detect change.
了解日常活动中能量消耗的个体间差异对于在监测研究和临床试验中准确估计能量消耗至关重要。本研究的目的是描述青春期女孩特定体育活动中能量消耗的变异性。
74名13至14岁的青春期女孩参与了这项横断面调查。数据于2001年收集，并于2004年进行分析。通过间接测热法测量了10项活动以及次极量自行车测力计测试期间的能量消耗，该测试用于估计心肺适能。通过标准差、变异系数和范围来表示不同活动的能量消耗变异性，这三个不同的能量消耗变量分别为：相对耗氧量（毫升/千克/分钟）、绝对耗氧量（升/分钟）和计算得出的代谢率（千焦/分钟）。
根据能量消耗的表达方式，变异系数范围从爬楼梯时的低至13.2%到玩电脑游戏时的高至38.4%。一些低强度活动的能量消耗变异性更大。在不同能量消耗表达方式中，骑自行车的变异系数始终较高（相对耗氧量、绝对耗氧量和计算得出的代谢率的变异系数分别为29.1%、37.7%和33.5%）。
青春期女孩日常活动的能量消耗具有高度变异性。无论能量消耗表达方式如何，一些低强度活动的变异系数更高。这种变异性可能会影响对体育活动干预措施的评估，特别是在规定活动剂量和检测变化的统计效力等问题上。
