Heat production and substrate oxidation in rats fed at maintenance level and during fasting

被引:15
作者
Chwalibog, A
Jakobsen, K
Tauson, AH
Thorbek, G
机构
[1] Royal Vet & Agr Univ, Dept Anim Sci & Anim Hlth, DK-1870 Frederiksberg, Denmark
[2] Danish Inst Agr Sci, Res Ctr Foulum, DK-8830 Tjele, Denmark
来源
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR AND INTEGRATIVE PHYSIOLOGY | 1998年 / 121卷 / 04期
关键词
carbohydrate oxidation; fasting; fat oxidation; heat production; indirect calorimetry; maintenance; protein oxidation; rat;
D O I
10.1016/S1095-6433(98)10153-8
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
A total of 36 Wistar rats were fed a commercial diet to a stipulated live weight of 75 g (Group A), 100 g (Group B) and 225 g (Group C). All rats were measured in energy balance experiments, in which the animals were fed near maintenance level, followed by a period of fasting with measurements of the gas exchange. The rats in Group A, B and C were fasted for 2, 3 and 4 days, respectively. The minimum heat production on the last day of fasting for all groups was proportional to metabolic body weight (kg(0.75)) with a regression: heat production, kJ day(-1) = 321 x kg(0.75) (R-2 = 0.994). In rats fed near maintenance level, heat production was provided by oxidation of carbohydrates in 80-85%, oxidation of protein was 10-15%, while oxidation of fat contributed less than 10%,. It is suggested that in the fasting period, the contribution to the total heat production front oxidized carbohydrate and fat depended on the size of the fat depots, a large fat depot giving rise to fat or;oxidation. On the last day of fasting, 24, 51 and 90% of the total heat originated from fat oxidation in Group A, B and C, respectively. (C) 1998 Elsevier Science Inc. All rights reserved.
引用
收藏
页码:423 / 429
页数:7
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