Data collection
RPE
This was a double-blinded, randomized, placebo-controlled crossover study design in which the effect of CAF supplementation was investigated on subsequent taekwondo-specific agility test (TSAT), 10 s frequency speed of kick test (FSKT-10s), multiple frequency speed of kick test (FSKT-multi) performances and the rating of perceived exertion (RPE) in elite and sub-elite male and female taekwondo athletes. After familiarization with the testing procedures (72 h before the experiments), athletes were subjected to 3 different conditions: (1) Control—no treatment (CON), (2) CAF—caffeine ingestion (3 mg kg