Green Tea Extract: Enhances Fat Oxidation During Exercise?

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Presentation transcript:

Green Tea Extract: Enhances Fat Oxidation During Exercise? Nicole Wirth NUT 3200-002 Fall 2013

Green tea extract: isolate of epigallocatechin-3-gallate + caffeine (varies per supplement). EGCG is classified as a flavonoid phytochemical which have antioxidant properties in the body, and has shown to decrease or shrink cancer cells. 1

Does EGCG Enhance Fat Oxidation During Exercise? Eight male competitive cyclists in New Zealand Teavigo supplementation (90% EGCG, 0.1% caffeine) 5x/day for 6 days Required to refrain from additional green tea Daily caffeine limited to 2 drinks/day 2 Eight male competitive cyclists in New Zealand (similar ht, wt, & build) Teavigo supplementation (90% EGCG, 0.1% caffeine) Placebo: 270 mg glucose powder capsules 5x/day for 6 days Required to refrain from additional green tea Daily caffeine limited to 2 drinks/day

Does EGCG Enhance Fat Oxidation During Exercise? 60 minute ride at 60% of VO2 Max 40K time trial at maximum effort RER and blood samples before & during exercise Study conducted 3x 2 60 minute ride at 60% of VO2 Max 40K time trial at maximum effort RER and blood samples before & during Study conducted 3x

Conclusion EGCG did not significantly affect fat oxidation: At rest During steady state exercise During maximal effort exercise 2 Can possibly take for slight increase in Central Nervous System activity during endurance / high intensity activities (up to 20 minutes) 3 Not the best choice

References 1. Bhagwat S, Haytowitz DB, Holden JM. USDA Database for the Flavonoid Content of Selected Foods. September 2011, Release 3: 14, 23-24, 91. Available at: http://www.ars.usda.gov/nutrientdata. Accessed September 4, 2013. 2. Dean S, Braakhuis A, Paton C. The Effects of EGCG on Fat Oxidation and Endurance Performance in Male Cyclists. International Journal of Sport Nutrition and Exercise Metabolism. 2209; 20: 624-644. 3. Dunford M, Doyle JA. Nutrition for Sport and Exercise. Belmont, CA: Wadsworth, Cengage Learning; 2012: 20.