NCT07150533

Green Tea Extract and Ginger

Synergistic Effects of Green Tea Extract and Ginger Supplementation on Endurance Performance and Thermal Perception in Normal and Cold Environments: A Randomized Crossover Trial

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 16 (actual)
• Sponsor: Erzurum Technical University · Academic / Other
• Sex: Male
• Age: 18 Years – 35 Years
• Healthy volunteers: Accepted

Summary

This study investigates the effects of green tea extract and ginger supplementation, both individually and in combination, on endurance performance, metabolism, thermal comfort, and muscle soreness in recreationally active young men. Participants will complete cycling tests under both normal room temperature (21-24°C) and cold (5-7°C) conditions. The study uses a randomized, double-blind, placebo-controlled, crossover design to compare the outcomes of placebo, green tea, ginger, and combined supplementation. The findings may help to identify nutritional strategies that improve exercise performance and comfort in different environmental conditions.

Detailed description

This randomized, double-blind, placebo-controlled, crossover trial is designed to evaluate the effects of green tea extract and ginger supplementation, both individually and in combination, on endurance performance, metabolic responses, thermal sensation, and muscle soreness in recreationally active men. Sixteen healthy participants will complete eight experimental conditions: placebo, green tea extract (500 mg), ginger (1 g), and a combination of both, tested under normal (21-24°C) and cold (5-7°C) environments. Each condition will be separated by a washout period to avoid carryover effects. Endurance capacity will be measured using a time-to-exhaustion cycling test at 70% of maximal oxygen uptake (VO₂max). Metabolic responses will be assessed by gas analysis to determine respiratory exchange ratio (RER). Perceptual measures will include the Borg Rating of Perceived Exertion (RPE) and a thermal sensation scale, while muscle soreness will be evaluated 24 hours post-exercise using a visual analog scale (VAS). The study aims to determine whether the combined intake of green tea and ginger provides synergistic benefits over individual supplementation, particularly in cold environments where thermoregulation and endurance capacity are challenged. Findings may contribute to practical nutritional strategies that enhance exercise performance, comfort, and recovery under environmental stress conditions.

Conditions

• Nutritional Supplementation
• Exercise Physiology

Interventions

Type	Name	Description
DIETARY_SUPPLEMENT	Placebo Arm	Participants receive a placebo consisting of maltodextrin in capsule form, matched in appearance and taste to the active supplements.
DIETARY_SUPPLEMENT	Green Tea Extract	Participants receive 500 mg of standardized green tea extract in capsule form.
DIETARY_SUPPLEMENT	Ginger	Participants receive 1 g of ginger supplement in capsule form.
DIETARY_SUPPLEMENT	Combined Supplement (Green Tea + Ginger)	Participants receive a combination of 500 mg green tea extract and 1 g ginger, both administered in capsule form.

Timeline

• Start date: 2025-03-01
• Primary completion: 2025-07-01
• Completion: 2025-07-30
• First posted: 2025-09-02
• Last updated: 2025-09-02

Locations

1 site across 1 country: Turkey (Türkiye)