Abstract: Objective  To analyze the correlation between resting energy expenditure (REE) and body composition in overweight and obese people. Methods  A retrospective analysis was performed on overweight and obese people who underwent metabolic vehicle and body composition examination in Fuxing Hospital Affiliated to Capital Medical University from May 2021 to June 2022. REE was measured by indirect calorimetry, and body composition was measured by body composition analyzer. The measured REE values were compared with calculated body composition values, and the correlation between REE and body composition was analyzed. Results  A total of 332 subjects were included, including 82 males, with an average age of 37.72±9.82 years (20－62 years). Among them, 13 (15.9%) were overweight and 69 (84.1%) were obese. There were 250 females with an average age of  37.42± 9.60  years (19－65 years), among whom 50 (20%) were overweight and 200 (80%) were obese. The measured REE values of overweight and obese men and women were significantly higher than the calculated body composition values P<0.05. There was no significant correlation between REE measurement and all indexes in male overweight subjects P>0.05, while REE measurement in female overweight subjects was significantly positively correlated with height, weight, skeletal muscle and fat-free body weight P<0.05. The results of REE were positively correlated with skeletal muscle, body fat, percentage of body fat, degree of abdominal obesity and body mass index in height, weight and body composition P<0.05. There was a significant negative correlation with age. P <0.05. Conclusion  The calculated value of population composition in overweight and obese people is lower than the measured value of REE, and REE in obese people is positively correlated with height, weight, body mass index, fat mass, muscle mass and fat free weight. 

Key words: overweight, obesity, resting energy expenditure, indirect calorimetry,  , body composition