Daily Energy-Expenditure in Free-Living Children - Comparisonof Heart-Rate Monitoring with the Doubly Labelled Water ((H-2O)-H-2-O-18) Method

Barbara Livingstone, WA Coward, AM Prentice, PSW Davies, JJ Strain, PG McKenna, CA Mahoney, JA White, CM Stewart, MJJ Kerr

Research output: Contribution to journalArticle

Abstract

Total energy expenditure (TEE) was measured simultaneously in 36 free-living children aged 7, 9, 12, and 15 y over 10-15 d by the doubly labeled water (DLW) method and for 2-3 separate days by heart-rate (HR) monitoring. The 95% confidence limits of agreement (mean difference +/- 2SD) were -1.99 to +1.44 MJ/d. HR TEE discrepancies ranged from -16.7% to +18.8% with 23 values lying within +/- 10% of DLW TEE estimates. Boys and girls spent 462 +/- 108 and 318 +/- 120 min/d, respectively, in total physical activity (P < 0.0 1). Time spent in moderate and vigorous physical activity (MVPA) was 68 +/- 37 min/d by younger children (7-9 y) and 34 +/- 24 min/d by older children (12-15 y) (P < 0.001). Younger boys engaged in MVPA (91 +/- 33 min/d) and vigorous physical activity (VPA) (35 +/- 15 min/d) significantly longer than younger girls (MVPA, 39 +/- 16 min/d, P < 0.001; VPA, 10 +/- 4 min/d, P < 0.01) as did older boys (MVPA, 52 +/- 21 min/d; VPA, 30 +/- 18 min/d) compared with older girls (MVPA, 15 +/- 10 min/d; VPA, 8 +/- 5 min/d). HR monitoring provides a close estimation of the TEE of population groups and objective assessment of associated patterns of physical activity.
Original languageEnglish
Pages (from-to)343-352
JournalAmerican Journal of Clinical Nutrition
Volume56
Issue number2
Publication statusPublished - Aug 1992

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