Accelerometry and Energy Expenditure in Obese Adults and Normal Weight Controls

作者：Meyer K^*; Pereiro N; Encinas R; Bieber G; Laederach K; Limacher A

来源：Deutsche Zeitschrift fur Sportmedizin, 2013, 64(5): 120-125.

DOI：10.5960/dzsm.2012.070

• Accelerometer
• physical activity
• energy expenditure
• obesity

Objective: To evaluate a new triaxial accelerometer device for prediction of energy expenditure, measured as VO2/kg, in obese adults and normal-weight controls during activities of daily life. Subjects and methods: Thirty-seven obese adults (Body Mass Index (BMI) 37 +/- 5.4) and seventeen controls (BMI 23 +/- 1.8) performed eight activities for 5 to 8 minutes while wearing a triaxial accelerometer on the right thigh. Simultaneously VO2 and VCO2 were measured using a portable metabolic system. The relationship between accelerometer counts (AC) and VO2/kg was analysed using spline regression and linear mixed-effects models. Results: For all activities, VO2/kg was significantly lower in obese participants than in normal-weight controls. A linear relationship between AC and VO2/kg existed only within accelerometer values from 0 to 300 counts/min, with an increase of 3.7 (95%-confidence interval (CI) 3.4-4.1) and 3.9 ml/min (95%-C13.4-4.3) per increase of 100 counts/min in obese and normal-weight adults, respectively Linear modelling of the whole range yields wide prediction intervals for VO2/kg of +/- 6.3 and +/- 7.3 ml/min in both groups. Conclusion: In obese and normal-weight adults, the use of AC for predicting energy expenditure, defined as VO2/kg, from a broad range of physical activities, characterized by varying intensities and types of muscle work, is limited.

• 出版日期2013