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. 1998 Feb;78(2):131–136. doi: 10.1136/adc.78.2.131

Estimation of the energy cost of physical activity in infancy

J Wells 1, P Davies 1
PMCID: PMC1717472  PMID: 9579154

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.



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Selected References

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