Fuel metabolism during severe rowing exercise
Eight elite oarsmen were studied during and after six min of severe ergometer exercise. Power output averaged 380 +/- 28 watts. Serial venous blood samples and gas exchange measurements were obtained during exercise. In 4 of the 8 subjects, a primed periodic oral dose of the tracer (6,6-/sup 2/H/sub 2/)glucose was used to determine the effects of severe exercise on glucose metabolism. During exercise, the levels of lactate progressively increased to 12.2 +/- 1.3 mM (SE). There was little change in isotopic glucose enrichment during exercise (from 2.95 +/- 0.30 to 2.55 +/- 0.23 atom percent excess, APE). During recovery, isotopic glucose enrichment decreased significantly to 1.40 +/- 0.14 APE, indicating a substantial post-exercise plasma glucose flux. There were significant post-exercise increases in plasma glucose accumulation (from 84 +/- 5 to 131 +/- 3 mg/dl) and insulin concentration (0.57 +/- 0.08 to 1.34 +/- 0.15 ng/ml). These results suggest that muscle glycogen is the primary source of fuel during six minutes of maximal rowing exercise.
- Research Organization:
- Univ. of Pennsylvania, Philadelphia
- OSTI ID:
- 5388180
- Report Number(s):
- CONF-8604222-; TRN: 86-030491
- Journal Information:
- Fed. Proc., Fed. Am. Soc. Exp. Biol.; (United States), Vol. 45:3; Conference: 70. annual meeting of the Federation of American Society for Experimental Biology, St. Louis, MO, USA, 13 Apr 1986
- Country of Publication:
- United States
- Language:
- English
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EXERCISE
BIOLOGICAL EFFECTS
GLUCOSE
METABOLISM
BLOOD
DEUTERIUM
GLYCOGEN
INSULIN
LACTIC ACID
MAN
MUSCLES
TRACER TECHNIQUES
ALDEHYDES
ANIMALS
BIOLOGICAL MATERIALS
BODY FLUIDS
CARBOHYDRATES
CARBOXYLIC ACIDS
HEXOSES
HORMONES
HYDROGEN ISOTOPES
HYDROXY ACIDS
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
MAMMALS
MATERIALS
MONOSACCHARIDES
NUCLEI
ODD-ODD NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
PEPTIDE HORMONES
POLYSACCHARIDES
PRIMATES
SACCHARIDES
STABLE ISOTOPES
VERTEBRATES
550501* - Metabolism- Tracer Techniques