Completed

The Influence of Caffeine Supplementation on Discipline-Specific Performance and Training Activities in Combat Sports and Speed-Strength Disciplines

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What is being tested

Caffeine supplementation

+ Placebo treatment

Dietary Supplement
Who is being recruted

From 18 to 40 Years
See all eligibility criteria
How is the trial designed

Treatment Study

Placebo-ControlledPhase 3
Interventional
Study Start: May 2017
See protocol details

Summary

Principal SponsorPoznan University of Physical Education
Last updated: January 18, 2026
Sourced from a government-validated database.Claim as a partner

Study start date: May 15, 2017

Actual date on which the first participant was enrolled.

Caffeine (CAF) is often proposed as an ergogenic agent, especially during high-intensity efforts. CAF supplementation may reduce effort-induced multi-faceted symptoms of fatigue and can improve psychomotor functions (like agility or decision-making processes), which is required during the intermittent high-intensity efforts in combat sports and speed-strength disciplines. Moreover, it is suggested that CAF treatment is associated with increased glycolytic activity during simulated or real training/competition bouts, which results in performance and physical capacity improvement. However, there are hardly any data on the individual CAF-induced and dose-dependent changes in physical capacity and discipline-specific performance in combat sports and speed-strength disciplines. Therefore, the study aims to examine the effect of acute, different-dose CAF ingestion on physical capacity and discipline-specific performance in combat sports and speed-strength athletes, in a randomized, double-blind, placebo-controlled crossover trial.

Official TitleThe Influence of Caffeine Supplementation on Discipline-Specific Performance and Training Activities in Combat Sports and Speed-Strength Disciplines 
NCT03822663
Principal SponsorPoznan University of Physical Education
Last updated: January 18, 2026
Sourced from a government-validated database.Claim as a partner

Protocol

This section provides details of the study plan, including how the study is designed and what the study is measuring.
Design Details

26 patients to be enrolled

Total number of participants that the clinical trial aims to recruit.

Treatment Study

These studies test new ways to treat a disease, condition, or health issue. The goal is to see if a new drug, therapy, or approach works better or has fewer side effects than existing options.



Eligibility

Researchers look for people who fit a certain description, called eligibility criteria: person's general health condition or prior treatments.
Criteria

Any sex

Biological sex of participants that are eligible to enroll.

From 18 to 40 Years

Range of ages for which participants are eligible to join.

Healthy volunteers allowed

If individuals who are healthy and do not have the condition being studied can participate.

Criteria

Inclusion Criteria: * written consent to participate, * a current medical clearance to practice sports, * training experience: at least 2 years, * minimum of 4 workout sessions (in the discipline covered by the study) a week. Exclusion Criteria: * current injury, * any health-related contraindication, * declared general feeling of being unwell, * unwilling to follow the study protocol.

Study Plan

Find out more about all the medication administered in this study, their detailed description and what they involve.
Treatment Groups
Study Objectives

2 intervention groups are designated in this study

50% chance of being blinded to the placebo group

Treatment Groups

Group I

Experimental
Group taking oral CAF (Caffeine) supplementation in a different-dose crossover regimen.

Group II

Placebo
Group taking oral supplementation with placebo.

Study Objectives

Primary Objectives

Secondary Objectives

Study Centers

These are the hospitals, clinics, or research facilities where the trial is being conducted. You can find the location closest to you and its status.

This study has 1 location

Suspended

Department of Sports Dietetics, Poznan University of Physical Education

Poznań, PolandSee the location
CompletedOne Study Center