Estimation of the energy cost of physical activity in infancy
a Dunn
Nutrition Unit, Cambridge, b Childhood Nutrition Research Centre, Institute of
Child Health, London, c Queensland University
of Technology Red Hill, Australia
Correspondence to: Dr J C K Wells, Dunn Nutrition Unit, Downham's Lane, Milton Road, Cambridge CB4 1XJ.
Accepted 21 July 1997
OBJECTIVE
To estimate physical activity energy
expenditure (AEE) in groups of free living infants in the first year of life.
DESIGNMixed 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.
RESULTSAEE 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.
CONCLUSIONSEnergy 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.
© 1998 by Archives of Disease in Childhood
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