Acute Effects of Tribulus Terrestris on Anaerobic Power and Sprint Performance in Combat Sport Athletes

Overview

This study aims to investigate the acute effects of Tribulus terrestris supplementation on anaerobic performance and sprint times in trained male combat sport athletes. A total of 28 athletes from kickboxing, Muay Thai, and taekwondo disciplines will participate in a randomized, double-blind, placebo-controlled, crossover trial. Participants will ingest either a single oral dose of 625 mg Tribulus terrestris (40% saponins) or a placebo 60 minutes before performing performance tests. The performance assessments will include a 30-second Wingate anaerobic cycling test and 20 m and 100 m sprint tests using photocell timing gates. After a wash-out period, participants will cross over to the alternate condition. The primary outcomes are peak power and mean power from the Wingate test and sprint times over 20 m and 100 m.

This trial is designed to evaluate the acute ergogenic potential of Tribulus terrestris supplementation in combat sport athletes. Tribulus terrestris has traditionally been marketed as a natural testosterone booster and performance enhancer, yet its acute effects on high-intensity exercise performance remain unclear. Design and Methods Participants: 28 trained male athletes (Kickboxing n=12, Muay Thai n=10, Taekwondo n=6), aged 18-30 years, with at least 2 years of competitive training experience. Design: Randomized, double-blind, placebo-controlled, crossover. Intervention: A single dose of 625 mg Tribulus terrestris (40% saponins) or matched placebo (cellulose). Supplements will be ingested 60 minutes before testing. Procedures: After a standardized warm-up, participants will complete a 30-second Wingate test on a Monark cycle ergometer (resistance = 10% body mass) to measure peak power, mean power, and fatigue index. Following 10 minutes of recovery, participants will perform 20 m and 100 m sprint tests using double-beam photocells (Witty timing system). Each participant will perform both supplementation conditions with a ≥72 h wash-out. Outcomes Primary outcomes: Wingate peak power (W, W/kg), mean power (W, W/kg). Secondary outcomes: 20 m and 100 m sprint times (s). Ethics: Approved by the Ethics Committee of Atatürk University (Protocol No: E-70400699-000-2500104927). Written informed consent will be obtained from all participants.