Objective. To compare total daily energy expenditure (TDEE) from accelerometry models and combined heart rate with motion sensor.
Methods. Twenty male subjects were involved in this study (25.5 5.3 years; 73.2 9.9 kg). TDEE was measured using a combined heart rate (HR) monitor with a motion sensor (Actiheart), and the corresponding equations for the Actigraph uniaxial accelerometer. Paired-Samples T-Tests, regression models, and agreement between methods were used.
Results. At a group level analysis, there were significant differences between TDEE from Actiheart and all accelerometry models (p<0.05). The regressions between Actiheart and all accelerometry models did not differ from the line of identity, and the Pearson coefficient of correlation among these methods ranged from 0.72 to 0.82. Individual results demonstrated large limits of agreement, particularly in the Freedson and Crouter regressions presenting values below Actiheart of 1832 kcal/d and 1422 kcal/d, respectively. Swartz (p=0.005) was the only model to present no association between the difference and the mean of the methods (TDEE from accelerometry models – TDEE from Actiheart).
Conclusions. Our data indicate that on a group level all four models had moderate Pearson coefficient correlation values (R > 0.76). However on an individual level accelerometer did not present an expected accuracy in estimating TDEE from Actiheart.

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Journal: 2nd International Conference on Recent Advances and Controversies in Measuring Energy Metabolism; Maastricht Holland November 2-4th 2011

Keywords: ActiGraph, comparison, energy expenditure, Free living, Physical Activity, validity,

Applications: Energy Expenditure,

CamNtech Reference: AH11008

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