Effect of endurance training supplemented with green tea extract on substrate metabolism during exercise in humans

T. Ichinose, S. Nomura, Y. Someya, S. Akimoto, K. Tachiyashiki, K. Imaizumi

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Endurance training and ingestion of green tea extract (GTE), composed mainly of tea catechins (TC), are well known to enhance fat metabolism. However, their synergistic effects remain to be fully elucidated. We tested the hypothesis that endurance training supplemented with GTE would further accelerate whole-body fat utilization during exercise, compared with training alone, in humans. Twelve healthy male subjects [peak oxygen consumption, 50.7 ± 1.3 (SEM)mL/kg/min] were divided into two groups: GTE and placebo (PLA) groups. Subjects in both groups performed a cycle ergometer exercise at 60% of for 60min/day, 3 days/week, and daily ingested 572.8 or 0mg TC in GTE and PLA groups for 10 weeks, respectively. Before and after training, respiratory gas exchange was measured during 90-min exercise at pre-training ∼55% of After training, the average respiratory exchange ratio during exercise remained unchanged in the PLA group (post-training: 0.834 ± 0.008 vs pre-training: 0.841 ± 0.004), whereas it was lower in the GTE group (post-training: 0.816 ± 0.006 vs pre-training: 0.844 ± 0.005, P<0.05). These results suggest that habitual GTE ingestion, in combination with moderate-intense exercise, was beneficial to increase the proportion of whole-body fat utilization during exercise.

Original languageEnglish
Pages (from-to)598-605
Number of pages8
JournalScandinavian Journal of Medicine and Science in Sports
Volume21
Issue number4
DOIs
Publication statusPublished - 2011 Aug 1

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Keywords

  • Adipose tissue lipolysis
  • Catechin
  • Endurance
  • Metabolic adaptation
  • Training

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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