Resting energy expenditure, activity energy expenditure and total energy expenditure at age 91-96 years

E.M. Rothenberg*, I.G. Bosaeus, K.R. Westerterp, B.C. Steen

*Corresponding author for this work

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Abstract

There is a limited knowledge concerning energy requirements of the elderly, especially the oldest old (> 80 years). Energy requirements should be estimated from measurements of energy expenditure. For this purpose twenty-one free-living individuals (eight males, thirteen females) aged 91-96 years living in Goteborg, Sweden were studied. Total body water (TBW) measured by the doubly labelled-water (DLW) technique was 29 . 5 (SD 5 . 4) kg in females and 35 . 6 (SD 4 . 3) kg in males. TBW measured using bioelectric impedance (BLA) was 31 . 6 (SD 6 . 4) kg in females and 42 . 0 (SD 7 . 4) kg in males. The mean difference between TBW measured by BIA and that measured by DLW was 3 . 54 (sD 3 . 6) kg ( P = 0 . 0002). Resting metabolic rate (RMR) was measured using a ventilated-hood system and averaged 5 . 36 (SD 0 . 71) MJ/d in females (n 12) and 6 . 09 (SD 0 . 91) MJ/d in males (n 8). Difference between measured RMR and predicted BMR (n 20) was 0 . 015 (SD 0 . 86) MJ/d (NS). Total energy expenditure (TEE) measured by DLW averaged 6 . 3 (SD 0 . 81) MJ/d in females and 8 . 1 (SD 0 . 73) MJ/d in males. Activity energy expenditure (TEE-RMR), thus including diet-induced thermogenesis (DIT), averaged 0 . 95 (SD 0 . 95) MJ/d in females (n 12) and 2 . 02 (SD 1 . 13) MJ/d in males. Physical activity level (TEE/ BMR) averaged 1 . 19 (SD 0 . 19) in females and 1 . 36 (SD 0 . 21) (P = 0 . 08) in males. If DIT is assumed to be 10% of the TEE, energy spent on physical activity will be very low in this population.
Original languageEnglish
Pages (from-to)319-324
Number of pages6
JournalBritish Journal of Nutrition
Volume84
Issue number3
DOIs
Publication statusPublished - 1 Jan 2000

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