摘要：Activity energy expenditure (AEE) during free-living conditions can be assessed using devices based on different principles. To make proper comparisons of different devices' capacities to assess AEE, they should be evaluated in the same population. Thus, in the present study we evaluated, in the same group of subjects, the ability of three devices to assess AEE in groups and individuals during free-living conditions. In twenty women, AEE was assessed using RT3 (three-axial accelerometry) (AEERT3), Actiheart (a combination of heart rate and accelerometry) (AEEActi) and IDEEA (a multi-accelerometer system) (AEEIDEEA). Reference AEE (AEEref) was assessed using the doubly labelled water method and indirect calorimetry. Average AEEActi was 5760 kJ per 24 h and not significantly different from AEEref (5020 kJ per 24 h). On average, AEERT3 and AEEIDEEA were 2010 and 1750 kJ per 24 h lower than AEEref, respectively (P sd) were 2940 (Actiheart), 1820 (RT3) and 2650 (IDEEA) kJ per 24 h. The variance for AEERT3 was lower than for AEEActi (P = 0·006). The RT3 classified 60 % of the women in the correct activity category while the corresponding value for IDEEA and Actiheart was 30 %. In conclusion, the Actiheart may be useful for groups and the RT3 for individuals while the IDEEA requires further development. The results are likely to be relevant for a large proportion of Western women of reproductive age and demonstrate that the procedure selected to assess physical activity can greatly influence the possibilities to uncover important aspects regarding interactions between physical activity, diet and health.
关键词：Activity energy expenditure; Accuracy; Activity monitors; Doubly labelled water; Abbreviations AEE activity energy expenditure AEE5dresult total energy expenditure, measured using the doubly labelled water method during days 1–5 minus BMR measured using indirect calorimetry AEEActi activity energy expenditure assessed using Actiheart AEEIDEEA activity energy expenditure assessed using IDEEA AEEref activity energy expenditure assessed using the doubly labelled water method and indirect calorimetry AEERT3 activity energy expenditure assessed using RT3 CountsActi counts using Actiheart CountsIDEEA counts using IDEEA CountsRT3 counts using RT3 DIT dietary induced thermogenesis HRaR heart rate above resting heart rate MET metabolic equivalent TEE total energy expenditure TEE5dresult TEE during days 1–5 TEEIDEEA total energy expenditure measured using IDEEA TEEref total energy expenditure measured using the doubly labelled water method
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