ISSN:
1432-2013
Keywords:
RQ
;
C14O2
;
Lactate
;
Pyruvate
;
Carbohydrate Utilization
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary Four well-trained male subjects worked for periods of 6 h on bicycle ergometers at work loads requiring about 47% of their maximal aerobic capacity. In one series of studies they received only water; in a second series they received 100 g of sucrose containing 100 μc U-C14-labelled sucrose at the beginning of the fourth hour of work. In a third series of experiments, the same subjects received 100 g of non-labelled sucrose at the beginning of the fourth hour. During the experiment without U-C14-labelled sucrose, blood samples were withdrawn and analysed for glucose, lactate and pyruvate content. Data from C14O2 recovery in expired air showed a good correlation with the amount of carbohydrate oxidized during the sucrose experiment. Peak values for the respiratory exchange ratio showed the same time response as those observed for the C14O2 in the expired air. It is concluded that the observed rise in RQ after sucrose ingestion, under the conditions studied, is of metabolic origin, resulting from a complete conversion of pyruvate to CO2.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00591368
Permalink
