Green tea polyphenols attenuate resistance exercise-induced increase in pro-inflammatory cytokines in obese men

Document Type : Original Article

Authors

Department of Exercise Physiology, University of Kurdistan, Sanandaj, Iran.

Abstract

Green tea polyphenols have been suggested to exert anti-inflammatory actions in in vivo and in vitro studies. The aim of this study was to investigate the effect of green tea extract (GTE) supplementation on pro-inflammatory cytokines during a single bout of resistance exercise (RE) in obese men. Participants were ten obese men who participated in a randomized, double-blind, placebo-controlled (PL) crossover study, administered 14-day GTE (500 mg/day) supplementation and PL with a 14-day washout period. After the supplementation periods, the participants performed the RE protocol, consisting of three sets of six exercises, to failure at 75% of one repetition maximum (1RM) and 2 min rest between sets. The serum samples were collected pre- and post-RE and analyzed for TNF-α, IL-1α, and IFN-γ. RE significantly increased TNF-α and IL-1α in obese men by 15% (p=0.043) and 18.71% (p=0.003) above the pre-RE values in the PL condition, respectively. However, GTE supplementation inhibited acute RE-induced increases in the TNF-α and IL-1α levels in obese men. Moreover, changes in the IFN-γ level during RE tended to be lower in GTE compared to the PL condition. Based on the findings, it can be concluded that 14-day GTE supplementation offers protection against RE-induced increases in pro-inflammatory cytokines in obese men. These immunomodulatory effects of GTE may be, in part, due to the anti-inflammatory properties of GTE in obese men that can be considered as a potential therapeutic factor to ameliorate obesity-associated inflammation.

What is already known on this subject?

Obesity has been associated with low-grade, chronic inflammation in adipose and liver tissue. Green tea catechins, include epigallocatechin-3-gallate (EGCG), epigallocatechin (EGC), epicatechin-3-gallate (ECG), and epicatechin (EC) have been associated with antioxidant, anti-carcinogenic, anti-inflammatory, antidiabetic and anti-obesity properties.

 

What this study adds?

It was demonstrated that 2 weeks’ green tea polyphenols ingestion may be involved in reduction pro-inflammatory cytokines such as TNF-α, IL-1α, and IFN-γ during RE in obese men.

Keywords

Main Subjects

References

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Journal of Exercise & Organ Cross Talk
Volume 3, Issue 1
March 2023
Pages 8-14

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History

  • Receive Date: 08 January 2023
  • Revise Date: 12 March 2023
  • Accept Date: 13 March 2023
  • First Publish Date: 13 March 2023

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