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

source extracted confidence: high 2026-04-09
#antioxidants #blood-glucose #cross-over-studies #eating #estradiol

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

Ishikawa et al., 2022 | Nutrients | Rct

Citation

Ishikawa Akira, Matsuda Tomoka, ... Sakamaki-Sunaga Mikako. Effect of Green Tea Extract Ingestion on Fat Oxidation during Exercise in the Menstrual Cycle: A Pilot Study. Nutrients. 2022-Sep-21;14(19). doi:10.3390/nu14193896

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.

Key Findings

Our results suggest that GTE ingestion improves the decrease in fat oxidation in the LP.

Outcomes Measured

  • Requires manual extraction

Population

Field Value
Population See abstract
Sample Size See abstract
Age Range See abstract
Condition See abstract

MeSH Terms

  • Antioxidants
  • Blood Glucose
  • Cross-Over Studies
  • Eating
  • Estradiol
  • Fatty Acids, Nonesterified
  • Female
  • Humans
  • Lactates
  • Menstrual Cycle
  • Norepinephrine
  • Pilot Projects
  • Plant Extracts
  • Progesterone
  • Tea

Evidence Classification

  • Level: Rct
  • Publication Types: Journal Article, Randomized Controlled Trial
  • Vertical: green-tea

Provenance

Source extracted via PubMed E-utilities API on 2026-04-10