Wells J C, Davies P S
Dunn Nutrition Unit, Cambridge.
Arch Dis Child. 1998 Feb;78(2):131-6. doi: 10.1136/adc.78.2.131.
To estimate physical activity energy expenditure (AEE) in groups of free living infants in the first year of life.
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.
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.
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.
估算一岁以内自由生活婴儿群体的身体活动能量消耗（AEE）。
对124名健康婴儿进行混合纵向研究，在1.5至12个月期间进行了232次AEE估算。在多个时间点进行研究的婴儿被视为新的横断面数据点。使用双标记水估算总能量消耗和身体成分。根据体重预测睡眠代谢率。
AEE从1.5个月时能量摄入的5%增加到12个月时的34%。在同一时期，生长所需能量成本下降了90%，但可代谢摄入量仅下降了20%。
婴儿期能量越来越多地从生长转向活动。AEE值可能有助于从因素上估算群体的能量需求。然而，还需要进一步研究AEE的个体变异性，以及疾病、住院、手术和营养不良的影响。
