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Energy expenditure of ‘cafeteria’‐fed rats determined from measurements of energy balance and indirect calorimetry.
Author(s) -
Rothwell N J,
Stock M J
Publication year - 1982
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.1982.sp014270
Subject(s) - cafeteria , energy expenditure , energy balance , thermogenesis , endocrinology , zoology , medicine , body weight , chemistry , calorimetry , biology , adipose tissue , ecology , pathology , physics , thermodynamics
1. Energy expenditure was determined in rats fed a standard laboratory diet or a varied and palatable ‘cafeteria’ diet, from metabolizable energy intake and body energy gain over a 15 d experiment. This was compared with measurements of oxygen consumption (Vo2) made over 24 h during the first and second weeks of the experiment. 2. Metabolizable energy intake was elevated by 50% in ‘cafeteria’‐fed rats and these animals gained more weight and had a higher body fat content than stock‐fed controls. Energy expenditure derived from these measurements was 45% higher in the ‘cafeteria’ group, and the net efficiency for energy gain was significantly reduced. 3. Vo2 was increased by 45% in the ‘cafeteria’ group and the daily energy expenditure, estimated from Vo2, was identical to that derived from the energy balance for controls, and differed by only 3% for the ‘cafeteria’ group. 4. These results confirm the high levels of diet‐induced thermogenesis previously seen in hyperphagic, ‘cafeteria’‐fed rats and reaffirm the validity of the carcass balance method for estimating energy expenditure.