title: ENERGY EXPENDITURE AND INTAKE COMPARISONS IN CHILEAN CHILDREN 4-5 YEARS ATTENDING DAY-CARE CENTRES.
abstract: BACKGROUND
  the doubly labelled water (DLW) method has an accuracy of 1% and within-subject precision of 5-8%, depending on subject's age and environments issues. Energy intake assessment is prone to errors (>15- 20%) depending in the method utilized.
  
  
  OBJECTIVE
  to quantify DLW methodology errors in four to five year olds that could affect the comparison with energy intake.
  
  
  METHODS
  energy expenditure (TEE, by DLW), was assessed during 14 days in 18 preschool children, who attended eight hours daily to day-care centres. Energy intake was determined by a combined method: food weighing during weekdays and recall after leaving the Centre (17h to sleep time) plus 24 h recall, during the weekend. Several assumptions affecting DLW total error were assessed to determine their influence in the comparison to energy intake (i.e. background variability, space ratio, proportion of water subject to fractionation, food quotient value).
  
  
  RESULTS
  the individual mean energy expenditure was 1 373 ± 177 kcal and the energy intake (1 409 ± 161 kcal). The overall difference between intake and expenditure was 42.9 kcal/day (limits of agreement + 259.1 to -112.3 kcal/day). TEE measurement error only explained a minor quantity (2.4%), between both measurements, and the observed mean isotope dilution space was 1.030 ± 0.010 confirming the value utilized in adults studies.
  
  
  CONCLUSIONS
  energy expenditure data is similar to other studies in preschool children. The small difference found between energy intake and expenditure may be attributed to the applied energy intake methodology, the homogeneous diet at care centres during the week-days and the lower DLW methodology error.
authors: Institute of Nutrition and Food Technology (INTA), University of Chile, Santiago (Chile).. gsalazar@inta.uchile.cl.
authors: Gabriela
authors: G
authors: Salazar
authors: Institute of Nutrition and Food Technology (INTA), University of Chile, Santiago (Chile).. gsalazar@inta.uchile.cl.
authors: Fabián
authors: F
authors: Vásquez
authors: Institute of Nutrition and Food Technology (INTA), University of Chile, Santiago (Chile).. gsalazar@inta.uchile.cl.
authors: Maria P
authors: MP
authors: Rodríguez
authors: Institute of Nutrition and Food Technology (INTA), University of Chile, Santiago (Chile).. gsalazar@inta.uchile.cl.
authors: Ana M
authors: AM
authors: Andrade
authors: Institute of Nutrition and Food Technology (INTA), University of Chile, Santiago (Chile).. gsalazar@inta.uchile.cl.
authors: Maria A
authors: MA
authors: Anziani
authors: Institute of Nutrition and Food Technology (INTA), University of Chile, Santiago (Chile).. gsalazar@inta.uchile.cl.
authors: Fernando
authors: F
authors: Vio
authors: MRC Human Nutrition Research, Cambridge, United Kingdom.. gsalazar@inta.uchile.cl.
authors: Williams
authors: W
authors: Coward
mesh_terms: D001837:Body Weights and Measures; D002656:Child Day Care Centers; D002675:Child, Preschool; D002677:Chile / Q000453:epidemiology; D002149:Energy Intake; D004734:Energy Metabolism; D005260:Female; D006801:Humans; D008297:Male; D009749:Nutrition Surveys; D062486:Public Health Surveillance; D012129:Respiratory Function Tests