Competitive swimmers may find hope in research that found regularly taking green tea extract (GTE) could boost exercise endurance. According to a study, mice that regularly took 0.5 percent GTE supplementation (over a 10-week period) experienced a nearly 25 percent boost in endurance exercise performance, and an 8 percent increase with 0.2 percent (by weight) addition to food.
Researchers translated these mice results to humans: It was estimated that an athlete weighing 165 pounds would have to drink about four cups (0.8 liter) of green tea a day to match the effects found in mice.
The results further indicated that GTE is beneficial for improving endurance capacity (i.e. time to exhaustion) and that stimulation of fatty acid utilization is a promising strategy for improving endurance capacity. However, the positive effect of GTE supplementation is seen only over a long period of time, rather than a single high-dose.
Burning Fat With GTE
Another positive effect researchers uncovered during the study was that green tea has fat-burning properties, which are related to a class of polyphenols called catechins. Catechins have been reported to have various physiological and pharmacological properties over the years and consist mainly of:
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Epigallocatechin gallate (EGCG) -- the main active component of tea polyphenol's biological activity, found to prevent and postpone the occurrence of Alzheimer dementia, prevent and cure high blood lipid, arterisclerosis and cerebral thrombus
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Epicatechin gallate
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Gallocatechin gallate
Researchers discovered the long-term consumption of tea catechins was beneficial in offsetting the obesity-inducing effects of a high-fat diet, and that the effects could be attributed, partly, to the activation of hepatic lipid catabolism, involving the release of energy and resulting in the breakdown of complex materials.
Further, while green tea does contain caffeine, evidence shows that the performance enhancement seen through green tea consumption comes from catechins and not caffeine.
The American Journal of Physiology-Regulatory and Comparative Physiology November 24, 2004
Medical News Today January 27, 2005
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