Lazzer S, Busti C, Galli R, Boniello S, Agosti F, Lafortuna C, Sartorio A
Istituto Auxologico Italiano, IRCCS, Laboratorio Sperimentale Ricerche Auxo-Endocrinologiche, Milan and Verbania, Italy.
J Endocrinol Invest. 2009 Jan;32(1):79-82. doi: 10.1007/BF03345684.
The physical activity ratio (PAR) values are commonly used to convert subjects' physical activity recalls into estimates of daily energy expenditure (DEE). A PAR is defined as the ratio between energy expenditure corresponding to a sedentary or a physical activity (kJ/min) and basal metabolic rate [(BMR) kJ/min]. The objective of the present study was to determine the PAR for different sedentary and physical activities in obese adolescents. Thirty-three obese adolescents [mean body mass index: 35.1 kg/m2; 40.3 % fat mass] aged 11 to 17 yr participated in this study. BMR was assessed by indirect calorimetry after an overnight fast by means of an open-circuit, indirect computerised calorimetry with a rigid, transparent, ventilated canopy. Energy expenditures corresponding to various sedentary and physical activities in free-living conditions were determined using a portable metabolic unit, and body composition by bioelectrical impedance analysis (BIA). The PAR of each activity was obtained by dividing the assessed energy expenditure by BMR. In this study, the PAR of various sedentary and physical activities did not vary significantly with sex, age, and body mass. Thus, the data for boys and girls were combined and the PAR for 27 sedentary and physical activities were determined. The PAR values can be applied to determine the mean DEE (kJ) using the specific equation considering BMR (kJ/min), PAR, and duration (min) of each activity performed by the subject during the 24 h. This information will be useful to health-care professionals because estimation of DEE in obese adolescents is necessary in order to prescribe an adequate dietary therapy to induce a desired level of energy deficit.
体力活动比率（PAR）值通常用于将受试者的体力活动回忆转化为每日能量消耗（DEE）的估计值。PAR被定义为与久坐或体力活动相对应的能量消耗（千焦/分钟）与基础代谢率[（BMR）千焦/分钟]之间的比率。本研究的目的是确定肥胖青少年不同久坐和体力活动的PAR。33名年龄在11至17岁的肥胖青少年[平均体重指数：35.1kg/m²；体脂率40.3%]参与了本研究。禁食过夜后，通过带有刚性、透明、通风罩的开路间接计算机量热法，采用间接量热法评估基础代谢率。使用便携式代谢装置测定自由生活条件下各种久坐和体力活动对应的能量消耗，并通过生物电阻抗分析（BIA）测定身体成分。每项活动的PAR通过将评估的能量消耗除以基础代谢率获得。在本研究中，各种久坐和体力活动的PAR在性别、年龄和体重方面没有显著差异。因此，将男孩和女孩的数据合并，确定了27种久坐和体力活动的PAR。PAR值可用于使用特定方程确定平均DEE（千焦），该方程考虑了受试者在24小时内进行的每项活动的基础代谢率（千焦/分钟）、PAR和持续时间（分钟）。这些信息对医疗保健专业人员将很有用，因为为了开出适当的饮食疗法以诱导所需的能量赤字水平，有必要估计肥胖青少年的DEE。
