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Tea catechin intake enhances fat utilization during prolonged exercise after endurance training in humans
Author(s) -
Ichinose Takashi,
Nomura Sachiko,
Someya Yui,
Ishida Sanshi,
Akimoto Shunta,
Kobayashi Kyoko,
Tachiyashiki Kaoru,
Imaizumi Kazuhiko
Publication year - 2007
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.21.5.a577
Subject(s) - catechin , respiratory exchange ratio , chemistry , medicine , endocrinology , placebo , endurance training , lipolysis , zoology , heart rate , polyphenol , antioxidant , biochemistry , biology , adipose tissue , blood pressure , alternative medicine , pathology
We examined whether tea catechin intake enhances fat utilization during prolonged exercise (EX) after endurance training (ET) in humans. Fourteen male subjects (23 ± 0 yr (mean ± SE)) were divided into two groups: tea catechin intake (C; Vo 2peak in ml/min/kg, 51.4 ± 1.3) and placebo (P; 49.1 ± 1.9). Subjects in C and P performed cycle ergometer EX at 60% Vo 2peak for 1 h/day, 3 days/wk, and daily ingested 584 mg or 0 mg of tea catechin for 10 wk, respectively. Before and after ET, espiratory gas exchange was measured during 90‐min EX at pretraining ~55% Vo 2peak , and respiratory exchange ratio (RER) and whole body fat oxidation rate were determined by indirect calorimetry. After ET, Vo 2peak in C and P increased by 16.0% and 15.7%, respectively ( P < 0.05). RER during 60–90 min of EX decreased in C (0.809 ± 0.008 vs. 0.789 ± 0.004, P < 0.05), but did not in P (0.802 ± 0.005 vs. 0.801 ± 0.011). ET‐induced increase in whole body fat oxidation rate during its period was 6.8% in C, which was higher than 0.6% in P ( P < 0.05). Plasma glycerol concentration at 90 min of EX decreased in C and P after ET ( P < 0.05) with no significant difference in the decrease between them. Serum free fatty acid (FA) concentration similarly decreased in C and P ( P < 0.05). These results suggest that tea catechin intake enhances fat utilization during prolonged EX after ET not by increasing lipolysis in adipose tissue but by increasing nonplasma FA uptake in skeletal muscle.