Reference : Fructose utilization during exercise in men: rapid conversion of ingested fructose to ci...
Scientific journals : Article
Human health sciences : Endocrinology, metabolism & nutrition
http://hdl.handle.net/2268/14019
Fructose utilization during exercise in men: rapid conversion of ingested fructose to circulating glucose.
English
Jandrain, Bernard mailto [Centre Hospitalier Universitaire de Liège - CHU > > Diabétologie,nutrition, maladies métaboliques >]
Pallikarakis, N. [> > > >]
Normand, S. [> > > >]
Pirnay, Freddy mailto [Centre Hospitalier Universitaire de Liège - CHU > > Pneumologie-Allergologie >]
Lacroix, M. [> > > >]
Mosora, F. [> > > >]
Pachiaudi, C. [> > > >]
Gautier, J. F. [> > > >]
Scheen, André mailto [Université de Liège - ULg > Département des sciences cliniques > Diabétologie, nutrition et maladie métaboliques - Médecine interne générale >]
Riou, J. P. [> > > >]
1993
Journal of Applied Physiology (Bethesda, Md. : 1985)
American Physiological Society
74
5
2146-54
Yes (verified by ORBi)
8750-7587
1522-1601
Bethesda
MD
[en] Adult ; Blood Glucose/metabolism ; C-Peptide/blood ; Carbon Dioxide/metabolism ; Carbon Isotopes ; Energy Metabolism/physiology ; Exercise/physiology ; Fatty Acids, Nonesterified/blood ; Fructose/blood/pharmacokinetics ; Glucagon/blood ; Glucose/pharmacokinetics ; Glycerol/blood ; Humans ; Insulin/blood ; Lipid Metabolism ; Male ; Proteins/metabolism ; Pulmonary Gas Exchange/physiology ; Respiration/physiology
[en] The aim of the present study was to compare the metabolic fate of repeated doses of fructose or glucose ingested every 30 min during long-duration moderate-intensity exercise in men. Healthy volunteers exercised for 3 h on a treadmill at 45% of their maximal oxygen consumption rate. "Naturally labeled" [13C]glucose or [13C]fructose was given orally at 25-g doses every 30 min (total feeding: 150 g; n = 6 in each group). Substrate utilization was evaluated by indirect calorimetry, and exogenous sugar oxidation was measured by isotope ratio mass spectrometry on expired CO2. Results were corrected for baseline drift in 13C/12C ratio in expired air due to exercise alone. Fructose conversion to plasma glucose was measured combining gas chromatography and isotope ratio mass spectrometry. Most of the ingested glucose was oxidized: 81 +/- 4 vs. 57 +/- 2 g/3 h for fructose (2P < 0.005). Exogenous glucose covered 20.8 +/- 1.4% of the total energy need (+/- 6.7 MJ) compared with 14.0 +/- 0.6% for fructose (2P < 0.005). The contribution of total carbohydrates was significantly higher and that of lipids significantly lower with glucose than with fructose. The blood glucose response was similar in both protocols. From 90 to 180 min, 55-60% of circulating glucose was derived from ingested fructose. In conclusion, when ingested repeatedly during moderate-intensity prolonged exercise, fructose is metabolically less available than glucose, despite a high rate of conversion to circulating glucose.
http://hdl.handle.net/2268/14019

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