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Randomized Controlled Trial
. 2022 Sep 21;14(19):3896.
doi: 10.3390/nu14193896.

Effect of Green Tea Extract Ingestion on Fat Oxidation during Exercise in the Menstrual Cycle: A Pilot Study

Akira Ishikawa  1 , Tomoka Matsuda  1   2 , Hyunjun Gam  1 , Moe Kanno  1 , Mizuki Yamada  1 , Nodoka Ikegami  3 , Akiko Funaki  1   4 , Hazuki Ogata  3 , Kayoko Kamemoto  5 , Takashi Ichihara  6 , Mikako Sakamaki-Sunaga  3
Affiliations
Randomized Controlled Trial

Effect of Green Tea Extract Ingestion on Fat Oxidation during Exercise in the Menstrual Cycle: A Pilot Study

Akira Ishikawa et al. Nutrients. .

Abstract

In women, fat oxidation during exercise changes with the menstrual cycle. This study aimed to investigate the effect of green tea extract (GTE) ingestion on fat oxidation during exercise depending on the menstrual cycle phase. Ten women with regular menstrual cycles participated in this randomized, double-blind, crossover study. GTE or placebo was administered during the menstrual cycle’s follicular phase (FP) and luteal phase (LP). Participants cycled for 30 min at 50% maximal workload, and a respiratory gas analysis was performed. Serum estradiol, progesterone, free fatty acid, plasma noradrenaline, blood glucose, and lactate concentrations were assessed before, during, and after the exercise. Fat oxidation, carbohydrate oxidation, and the respiratory exchange ratio (RER) were calculated using respiratory gas. Fat oxidation during the exercise was significantly higher in the FP than in the LP with the placebo (p < 0.05) but did not differ between the phases with GTE. Carbohydrate oxidation, serum-free fatty acid, plasma noradrenaline, blood glucose, and lactate concentrations were not significantly different between the phases in either trial. Our results suggest that GTE ingestion improves the decrease in fat oxidation in the LP.

Keywords: catechin; estrogen to progesterone ratio; fat oxidation; green tea extract; indirect calorimetry.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
The schematic representation of the protocol. RPE, rating of perceived exertion; Pre, before exercise; Ex, 15 min during exercise; Post, immediately after exercise.
Figure 2
Figure 2
Carbohydrate oxidation for GTE (A) and PLA (B) trials. FP, follicular phase; LP, luteal phase; Pre, before exercise; Ex, 15 min during exercise; Post, immediately after exercise. * p < 0.05, ** p < 0.01.
Figure 3
Figure 3
Fat oxidation for GTE (A) and PLA (B) trials. FP, follicular phase; LP, luteal phase; Pre, before exercise; Ex, 15 min during exercise; Post, immediately after exercise. * p < 0.05, ** p < 0.01.
Figure 4
Figure 4
RER for GTE (A) and PLA (B) trials. FP, follicular phase; LP, luteal phase; RER, the respiratory exchange ratio; Pre, before exercise; Ex, 15 min during exercise; Post, immediately after exercise. * p < 0.05, ** p < 0.01.
See this image and copyright information in PMC

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