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25The aim of the study was to determine whether caffeine mouth rinse would improve 30 26 minutes self-paced cycling trial. Twelve healthy active males (age 20.5 ±0.7 yrs, mass 87.4 27 ±18.3 kg) volunteered for the study. They attended the laboratory on 3 separate occasions 28 performing a 30 minute self-paced cycling trial. On one occasion water was given as a 29 mouth rinse for 5 s (PLA), on another occasion a 6.4% CHO solution was given for 5 s and 30 finally a caffeine solution (containing 32 mg of caffeine dissolved in 125ml water; CAF) was 31 given for 5s. Distance cycled, heart rate, ratings of perceived exertion, cadence, speed and 32 power output were recorded throughout all trials. Distance cycled during the CAF mouth 33 rinse trial (16.2 ±2.8 km) was significantly greater compared to PLA trial (14.9 ±2.6km). 34There was no difference between CHO and CAF trials (P=0.89). Cadence, power and