Effects of infused sodium acetate, sodium lactate, and sodium beta-hydroxybutyrate on energy expenditure and substrate oxidation rates in lean humans - PubMed (original) (raw)
Effects of infused sodium acetate, sodium lactate, and sodium beta-hydroxybutyrate on energy expenditure and substrate oxidation rates in lean humans
R Chioléro et al. Am J Clin Nutr. 1993 Nov.
Abstract
Infusion of sodium acetate in lean humans results in a decrease in respiratory exchange ratio, which may be advantageous in patients with respiratory failure. However, this potential decrease in respiratory work was observed to be offset by significant thermogenesis. The metabolic effects of sodium acetate, sodium lactate, and sodium beta-hydroxybutyrate, infused at a rate of 20 mumol.kg-1.min-1 for 3 h, was monitored in six healthy human volunteers. Respiratory exchange ratio decreased from 0.85 +/- 0.02 at baseline to 0.75 +/- 0.02, 0.75 +/- 0.02, and 0.80 +/- 0.02, after acetate, lactate, or beta-hydroxybutyrate, respectively (P < 0.05 for each). Acetate produced a larger thermic effect (22.7% of energy infused) than did lactate (16.3%) or beta-hydroxybutyrate (13.6%). Thus, sodium salts of organic acids may potentially decrease the respiratory requirements by decreasing the respiratory exchange ratio. However, this effect is partially offset by the thermic effect of these substrates. The maximal doses and safety of these anions during larger infusion periods remain to be determined.
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