Differences in energy metabolism between normal weight 'large-eating' and 'small-eating' women.
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.
Clark
D
D
CSIRO, Division of Human Nutrition, Adelaide, Australia.
Tomas
F
F
Withers
R T
RT
Brinkman
M
M
Chandler
C
C
Phillips
J
J
Ballard
F J
FJ
Berry
M N
MN
Nestel
P
P
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
D009124:Muscle Proteins