Abstract：
BACKGROUND/OBJECTIVES:To test the association between physical activity measured using accelerometer counts (Actigraph) and energy expenditure (EE) measured using the doubly labelled water (DLW) method in free-living children in India. The aim of this study was to explore the usefulness of Actigraphs in estimating EE. SUBJECTS/METHODS:Total EE (TEE) was measured in 58 children aged 8-9 years over a period of 2 weeks using the DLW technique. Physical activity level (PAL) was estimated from TEE, and the basal metabolic rate was predicted from weight. Physical activity was measured simultaneously using the Actigraph accelerometers (MTI AM7164 and GT1M). TEE was also calculated from the Actigraph counts using a published equation. RESULTS:TEE (mean: 6.6 vs 5.7 MJ, P=0.04) and Actigraph counts (counts/minute: 557 vs 465, P=0.02; total counts: 445 534 vs 354 748, P=0.004) were higher in boys than in girls. There were no significant correlations between either total Actigraph counts (r=0.15, P=0.3) or counts/minute (r=0.18, P=0.2), and TEE estimated using DLW. Similarly, there were no significant correlations between Actigraph counts and PAL (r=0.10, P=0.5; r=0.17, P=0.2, respectively). The Bland-Altman analysis showed poor agreement between TEE estimated using the DLW method and TEE derived from the Actigraph equation. CONCLUSIONS:Activity measured using Actigraph accelerometers was not related to TEE and PAL derived using the DLW technique in children in Mysore. Actigraphs may not be useful in predicting EE in this setting, but may be better used for judging activity patterns.
journal_name
Eur J Clin Nutrjournal_title
European journal of clinical nutritionauthors
Krishnaveni GV,Veena SR,Kuriyan R,Kishore RP,Wills AK,Nalinakshi M,Kehoe S,Fall CH,Kurpad AVdoi
10.1038/ejcn.2009.95subject
Has Abstractpub_date
2009-11-01 00:00:00pages
1313-9issue
11eissn
0954-3007issn
1476-5640pii
ejcn200995journal_volume
63pub_type
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