Track and Field can require athletes to perform at high levels early in the morning. Because there is evidence that the time of day can affect human performance, coaches and athletes should arm themselves with strategies to improve psycho-motor performance. PURPOSE: To examine the effects of low-dose caffeine as a method of improving early morning psycho-motor performance and physical performance in athletes involved in the shot put event. METHODS: Participants were 9 inter-collegiate track athletes (age: 20.33+1.58yrs, ht: 1.77+0.11cm, wt: 106.26+ 2.34kg, bmi: 33.72+ 5.23). A double-blind, randomized, within subjects design was used to investigate the effects of buccal caffeine supplementation on psycho-motor and athletic performance in the shot put. Participants reported for testing at 6:00 am and received one 100 mg caffeine chewing gum supplement (CAF) treatment or a similar placebo (PLAC). Participants then completed a series of 5 warm-up throws followed by 6 attempts with a shot put (16lbs for males, 4kg for females) measured for distance. A psychomotor vigilance test (PVT) was administered 5 minutes subsequent to the caffeine administration. Following the 6th attempt the PVT was re-administered. The effects of the treatment on PVT were evaluated with an ANCOVA (treatment*time with weight/gender) An ANOVA (treatment*time) was performed to compare performance between the CAFF and PLAC treatments. RESULTS: A significant treatment x time interaction was revealed for PVT performance (F1,2= 11.163, hp2=0.650, p=0.016). The caffeine treatment resulted in a faster mean reaction time (pre: 0.306±0.013 vs 0.317±.021, post: 0.316±.018 vs 0.323±0.021); however, the different pre to post was greatest in the caffeine group (0.01 vs 0.06). A significant difference (treatment* throw) was found (F1,5=2.795, hp2= 0.259, p=0.030) indicating that the CAFF treatment produced better performance over the course of the six attempts. Paired samples t-test revealed that the first attempt between the CAFF treatment (9.62m±1.71) and the PLAC treatment (9.05m±1.69) was significantly different (p=0.017, ES=0.996, 95%CI 1.02m to 0.13m). CONCLUSION: These findings suggest that low-dose caffeine is an effective ergogenic aid and can have a positive effect on psycho-motor performance in early morning shot put performance.