title: Differences in energy metabolism between normal weight 'large-eating' and 'small-eating' women.
abstract: Nine 'large-eating' (approximately 12 MJ/d) and nine 'small-eating' (approximately 5.3 MJ/d) women were selected from the population on the basis of diet and activity diaries. At rest and in the post-absorptive state the rate of oxygen consumption (VO2)/kg fat-free mass (FFM) and rate of carbon dioxide production (VCO2)/kg FFM were 9-17% higher (P < 0.05) in the 'large-eaters' than in the 'small-eaters'. As energy expenditure was increased by walking at 2.4, 3.9 and 5.4 km/h the differences between the two experimental groups for both VO2/kg FFM and VCO2/kg FFM were decreased to negligible values, but energy expended on a body-weight basis (MJ/kg per min) remained significantly higher (5-10%) in 'large-eaters'. Oral temperature was also consistently higher (up to 0.5 degrees) in this group both at rest and during sitting, standing and walking activities. Although the average thermic effect of a standardized liquid meal tended to be higher (27%; not significant) in the 'small-eaters', the other results demonstrate that the 'large-eating' females had a markedly higher rate of energy expenditure at rest and during light physical activities.
authors.affiliation: CSIRO, Division of Human Nutrition, Adelaide, Australia.
authors.forename: D
authors.initials: D
authors.lastname: Clark
authors.forename: F
authors.initials: F
authors.lastname: Tomas
authors.forename: R T
authors.initials: RT
authors.lastname: Withers
authors.forename: M
authors.initials: M
authors.lastname: Brinkman
authors.forename: C
authors.initials: C
authors.lastname: Chandler
authors.forename: J
authors.initials: J
authors.lastname: Phillips
authors.forename: F J
authors.initials: FJ
authors.lastname: Ballard
authors.forename: M N
authors.initials: MN
authors.lastname: Berry
authors.forename: P
authors.initials: P
authors.lastname: Nestel
mesh_terms: D000328:Adult; D001835:Body Weight; D002153:Calorimetry, Indirect / Q000379:methods; D003720:Densitometry / Q000379:methods; D004435:Eating / Q000502:physiology*; D004734:Energy Metabolism / Q000502:physiology*; D005260:Female; D006801:Humans; D008875:Middle Aged; D009124:Muscle Proteins / Q000378:metabolism
chemical_list: D009124:Muscle Proteins