Goss et al. (1993) Amino acid arterial concentration and muscle exchange during submaximal arm and leg exercise: the effect of dihydroxyacetone and pyruvate

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Amino acid arterial concentration and muscle exchange during submaximal arm and leg exercise: the effect of dihydroxyacetone and pyruvate

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CONTRIBUTORS:

	Author:	Stanko, R. T.
	Author:	Diven, W. F.
	Author:	Robertson, R. J.
	Author:	Spina, R. J.
	Author:	Galbreath, R. W.
	Author:	Reilly, J. J.
	Author:	Goss, F. L.

JOURNAL:

Journal of Sports Sciences (JSS), 11(1), ?? - ??.

YEAR:

1993

PUB TYPE:

Journal Article

SUBJECT(S):

EXERCISE; AMINO-ACID; ADAPTATION; NON-ATHLETE; YOUNG-ADULT; MAN; MUSCLE; ARM; LEG; PYRUVATE

DISCIPLINE:

No discipline assigned

HTTP:

LANGUAGE:

English

PUB ID:

103-366-389 (Last edited on 2002/02/27 18:45:08 US/Mountain)

SPONSOR(S):

ABSTRACT:
The mixture of dihydroxyacetone and pyruvate (DHAP) is an ergogenic aid that enhances muscle glucose extraction during prolonged aerobic exercise. In order to evaluate the effect of DHAP on muscle amino acid extraction during exercise, we measured arterial concentration and muscle exchange of amino acids in 18 untrained healthy male subjects (aged 20-30 years) performing dynamic arm (60 percent VO2max, n=9) or leg (70 percent VO2max, n=9) exercise to exhaustion with and without dietary supplementation of DHAP. The subjects consumed diets (146 kJ kg body weight-1 day-1) containing either 100 g polyglucose, Polycose (placebo, P) or DHAP (3:1, treatment) substituted for a portion of carbohydrate. The two diets were administered in a double-blind, random, crossover order for a 7-day period. At least 7 days separated the dietary protocols. Blood samples were drawn through radial artery and axillary or femoral vein catheters at rest, during exercise and at exhaustion. Arterial alanine with exercise but remained elevated after leg exercise. Despite changes in arterial concentrations of alanine with exercise, muscle exchange of alanine was not altered with exercise. Exercise did not alter muscle exchange or any amino acid. Arterial amino acid concentrations and muscle exchange of amino acids with exercise were similar with or without DHAP feeding. We conclude that consumption of DHAP does not alter arterial concentration or muscle exchange of amino acids during submaximal arm and leg exercise.

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