The Respiratory Quotient during Rest and Exercise

FIGURE S.8 Ke piratory quotient during rest after an overnight fast. Redrawn with permission from Leff ct ef., 1987.) 

FIGURE 5-9 Respiratory quotient prior to exercise, during bicycling, and during a subsequent recovery period. The RQ increases with exercise, indicating a shitt from fat oxida-tion to glycogen oxidation. (Reprinted with permission from Murray el ai 1977,) 

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The Respiratory Quotient during Rest and Exercise Fatty Acid Biosynthesis... 

Another goal of the USDA study was to determine whether CLA enhanced energy expenditure, lipolysis, or fat oxidation in humans, similar to the effects observed in animals. Accordingly, measurements of metabolic rate and respiratory quotient were made by indirect calorimetry, and stable isotope tracers of palmitate and glycerol were used to measure the rate of appearance of free fatty acids and glycerol as well as whole body lipolysis and apparent reesterification. CLA supplementation had no effect on metabolic rate or whole-body fat oxidation rate during rest or exercise. Similarly, CLA did not change lipolytic rate, fatty acid release from adipose tissue, or apparent FFA reesterification rates under conditions of rest or exercise (33). 

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