Heat Production from Human Erythrocytes in Relation to their Metabolism of Glucose and Amino Acids

1974 ◽  
Vol 34 (2) ◽  
pp. 141-148 ◽  
Author(s):  
K. Levin ◽  
P. Furst ◽  
R. Harris ◽  
E. Hultman
Keyword(s):  
Amino Acids ◽  
Heat Production ◽  
Human Erythrocytes

scholarly journals Thermic effect of glucose and amino acids in man studied by direct and indirect calorimetry

1974 ◽  
Vol 31 (3) ◽  
pp. 343-349 ◽  
Author(s):  
Ph. Pittet ◽  
P. H. Gygax ◽  
E. Jéquier
Keyword(s):  
Amino Acids ◽  
Energy Balance ◽  
Metabolic Rate ◽  
Heat Production ◽  
Indirect Calorimetry ◽  
Control Period ◽  
Essential Amino Acids ◽  
Specific Dynamic Action ◽  
Heat Losses ◽  
Thermic Effect

1. In order to reinvestigate the classical concept of specific dynamic action of food, the thermic effect of ingested glucose (50 g) or essential amino acids (50 g) or both was measured in seven healthy male subjects dressed in shorts, by using both direct and indirect calorimetry simultaneously. Experiments were performed under conditions of thermal comfort at 28°.2. Energy ‘balance’ (heat production minus heat losses) was negative during the control period (mean heat deficit: −16.0 ± 0.8 kJ/m2 per h.3. Metabolic rate increased 13.6 ± 1.8% after the glucose load, 17.2 ± 1.4% after amino acids, and 17.3 ± 2.9% after both glucose and amino acids: thus there was no additive thermic effect when both nutrients were given together.4. In contrast to the metabolic rate, heat losses were not significantly altered after nutrient ingestion; consequently, the energy ‘balance’ became rapidly positive.5. These results show that: (a) the food-induced thermogenesis, for a moderate energy intake, is less dependent on the nature of the nutrients than was classically admitted; (b) this increased heat production mainly induces changes in heat storage rather than in heat losses during the first hours following ingestion of a meal.

Renal oxygen consumption, thermogenesis, and amino acid utilization during i.v. infusion of amino acids in man

1994 ◽  
Vol 267 (5) ◽  
pp. E648-E655 ◽  
Author(s):  
T. Brundin ◽  
J. Wahren
Keyword(s):  
Amino Acids ◽  
Blood Flow ◽  
Oxygen Consumption ◽  
Amino Acid ◽  
Oxygen Uptake ◽  
Heat Production ◽  
Whole Body ◽  
Arterial Blood ◽  
Renal Oxygen Consumption ◽  
Renal Oxygen

The renal contribution to the amino acid-induced whole body thermogenesis was examined. Using indirect calorimetry and catheter techniques, pulmonary and renal oxygen uptake and blood flow, blood temperatures, and net renal exchange of amino acids, glucose and lactate were measured in eight healthy men before and during 3 h of intravenous infusion of 720 kJ of an amino acid solution. During the infusion, the pulmonary oxygen uptake increased from 252 +/- 12 to 310 +/- 8 ml/min, cardiac output increased from 5.9 +/- 0.3 to 6.8 +/- 0.3 l/min, and the arterial blood temperature increased from 36.34 +/- 0.04 to 36.68 +/- 0.07 degrees C. Renal oxygen consumption, heat production, blood flow, and net glucose exchange remained unchanged during the infusion. The net renal uptake of amino acid energy from the blood rose from 2 +/- 2 to 11 +/- 4 W. The total renal energy expenditure was 9-10 W throughout the study period. It is concluded that intravenous amino acid infusion greatly augments the uptake and utilization of amino acids in the kidneys but does not stimulate the renal oxygen consumption, heat production, blood flow, or glucose release.

Effects of N-phosphorylated amino acids on membrane phospholipid of human erythrocytes

1993 ◽  
Vol 19 (2) ◽  
pp. 85-94 ◽  
Author(s):  
Yanmei Li ◽  
Xiuhong Wang ◽  
Yufen Zhao ◽  
Jianyuan Yu ◽  
Mingqiu Wan ◽  
...  
Keyword(s):  
Amino Acids ◽  
Human Erythrocytes ◽  
Membrane Phospholipid
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