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Science Forum Index » Life Extension Forum » Green tea extract ingestion, fat oxidation, and...
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| Olafur Pall Olafsson... |
 Posted: Tue May 06, 2008 9:19 pm |
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Am J Clin Nutr. 2008 Mar;87(3):778-84.
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Green tea extract ingestion, fat oxidation, and glucose tolerance
in healthy humans.
Venables MC, Hulston CJ, Cox HR, Jeukendrup AE.
Human Performance Laboratory, School of Sport and Exercise
Sciences, The University of Birmingham, Birmingham, United Kingdom.
BACKGROUND: Green tea consumption is reportedly associated with
various health-promoting properties. For example, it has been shown to
promote fat oxidation in humans at rest and to prevent obesity and
improve insulin sensitivity in mice. OBJECTIVE: We investigated the
effects of acute ingestion of green tea extract (GTE) on glucose
tolerance and fat oxidation during moderate-intensity exercise in
humans. DESIGN: Two studies were performed, both with a counter-
balanced crossover design. In study A, 12 healthy men performed a 30-
min cycling exercise at 60% of maximal oxygen consumption (VO2max)
before and after supplementation. In study B, 11 healthy men took an
oral-glucose-tolerance test before and after supplementation. In the
24-h period before the experimental trials, participants ingested 3
capsules containing either GTE (total: 890 +/- 13 mg polyphenols and
366 +/- 5 mg EGCG) or a corn-flour placebo (total: 1729 +/- 22 mg).
RESULTS: Average fat oxidation rates were 17% higher after ingestion
of GTE than after ingestion of placebo (0.41 +/- 0.03 and 0.35 +/-
0.03 g/min, respectively; P < 0.05). Moreover, the contribution of fat
oxidation to total energy expenditure was also significantly higher,
by a similar percentage, after GTE supplementation. The insulin area
under the curve decreased in both the GTE and placebo trials (3612 +/-
301 and 4280 +/- 309 microIU/dL . 120 min, respectively; P < 0.01),
and there was a concomitant increase of 13% in insulin sensitivity.
CONCLUSIONS: Acute GTE ingestion can increase fat oxidation during
moderate-intensity exercise and can improve insulin sensitivity and
glucose tolerance in healthy young men.
Publication Types:
* Randomized Controlled Trial
PMID: 18326618 [PubMed - indexed for MEDLINE]
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