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Original article
Estimation of the energy cost of physical activity in infancy
  1. Jonathan C K Wellsa,b,
  2. Peter S W Daviesc
  1. aDunn Nutrition Unit, Cambridge, bChildhood Nutrition Research Centre, Institute of Child Health, London, cQueensland University of Technology Red Hill, Australia
  1. Dr J C K Wells, Dunn Nutrition Unit, Downham’s Lane, Milton Road, Cambridge CB4 1XJ.

Abstract

OBJECTIVE To estimate physical activity energy expenditure (AEE) in groups of free living infants in the first year of life.

DESIGN Mixed longitudinal study of 124 healthy infants, using 232 estimations of AEE made between 1.5 and 12 months. Infants studied at more than one time point were treated as new cross sectional data points. Total energy expenditure and body composition were estimated using doubly labelled water. Sleeping metabolic rate was predicted from weight.

RESULTS AEE increased from 5% of energy intake at 1.5 months to 34% at 12 months. Growth costs declined by 90%, but metabolisable intake by only 20%, over the same period.

CONCLUSIONS Energy is increasingly diverted from growth to activity during infancy. Values for AEE may aid in estimating energy requirements of groups factorially. Further work is required, however, on individual variability in AEE, and on the effects of disease, hospitalisation, surgery, and malnutrition.

  • energy requirements
  • energy expenditure
  • doubly labelled water

https://doi.org/10.1136/adc.78.2.131

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