Green Tea, Intermittent Sprinting Exercise, and Fat Oxidation.

Daniel Gahreman,Yati Boutcher,Stephen Boutcher,Rose Wang

doi:10.3390/nu7075245

Daniel Gahreman, Yati Boutcher + Show 2 more

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https://doi.org/10.3390/nu7075245

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Journal: Nutrients	Publication Date: Jul 13, 2015
Citations: 76	License type: CC BY 4.0

Affiliation: Charles Darwin University, UNSW Sydney

Abstract

Fat oxidation has been shown to increase after short term green tea extract (GTE) ingestion and after one bout of intermittent sprinting exercise (ISE). Whether combining the two will result in greater fat oxidation after ISE is undetermined. The aim of the current study was to investigate the combined effect of short term GTE and a single session of ISE upon post-exercise fat oxidation. Fourteen women consumed three GTE or placebo capsules the day before and one capsule 90 min before a 20-min ISE cycling protocol followed by 1 h of resting recovery. Fat oxidation was calculated using indirect calorimetry. There was a significant increase in fat oxidation post-exercise compared to at rest in the placebo condition (p < 0.01). After GTE ingestion, however, at rest and post-exercise, fat oxidation was significantly greater (p < 0.05) than that after placebo. Plasma glycerol levels at rest and 15 min during post-exercise were significantly higher (p < 0.05) after GTE consumption compared to placebo. Compared to placebo, plasma catecholamines increased significantly after GTE consumption and 20 min after ISE (p < 0.05). Acute GTE ingestion significantly increased fat oxidation under resting and post-exercise conditions when compared to placebo.

Highlights

The increasing prevalence of overweight and obesity is associated with numerous cardiovascular and metabolic diseases [1,2,3]
Green tea extract (GTE) is produced from the leaves of camellia sinensis [1] and contains catechins which are the predominant form of polyphenols
green tea extract (GTE) capsules consumed the day before exercise contained a total of 562.5 mg polyphenols and 375 mg, whereas the one GTE capsule consumed on the exercise day, 90 min before exercise, contained 187.5 mg polyphenols and 125 mg epigallocatechin gallate (EGCG)

Summary

Introduction

The increasing prevalence of overweight and obesity is associated with numerous cardiovascular and metabolic diseases [1,2,3]. The minimal long-term effectiveness of these methods has focused attention on other fat loss strategies such as green tea ingestion [7] and participation in intermittent sprinting exercise (ISE) [8]. EGCG is the most pharmacologically active of the catechins which typically accounts for approximately 50% of the catechin content of green tea [9]. Green tea typically contains a small amount of caffeine estimated to be about three to five percent of its dry weight [10]. Short term ingestion of tea catechins, typically one to two days before testing, has been shown to increase fat oxidation, during the postprandial period, as indicated by a reduced respiratory exchange ratio (RER) during indirect calorimetry [4,11,12,13,14]

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