Effects of L-Tyrosine and Caffeine on Performance in Elite Boxers

Participants will complete six sessions, including one familiarization and baseline session followed by five experimental conditions: control (no supplementation), placebo, L-tyrosine, caffeine, and combined L-tyrosine plus caffeine. The experimental conditions will be performed in a randomized, counterbalanced crossover design with a washout period of at least 72 hours between sessions. Resting physiological and cognitive assessments will be performed during the familiarization session, while biochemical, cognitive, and boxing-specific performance assessments will be conducted before and after each experimental session.

NCT Number	NCT07530185
Lead Sponsor	Inonu University Collaborators: Ataturk University
Conditions	Sports Performance
Enrollment	18 participants
Start Date	2026-09
Primary Completion	2026-12 (estimated)
Study Completion	2027-03 (estimated)
Updated on ClinicalTrials.gov	2026-07-08