Abstract:

Introduction: There are still gaps in relation to caffeine and creatine supplementation and high intensity intermittent performance. Objective: To measure and compare the acute effects of using creatine, caffeine or placebo supplementation during 6 days onintermittent physical performance in sedentary women. Materials and methods: 32 healthy women, aged between 19 and 30 years, were allocated to a control group, and three other experimental groups: i) caffeine (CAF, 6mg/kg-day); ii) creatine (CRE, 20g/day)andplacebo (PLA, 6mg/kg-day of starch). Pre and post 6 days of supplementation, they were subjected to an intermittent high intensity test (HIT-test). Values of systolic (SBP) and diastolic (DBP) blood pressure and blood lactate concentration ([LAC]) were collected. During the test, power data were recorded (maximum: PMAX, average: PMED, and minimum: PMIN). At the end of the HIT-test, the rate of perceived exertion (RPE) was collected. Results: In SBP, significant differences were observed between the pre and post HIT-test moments (p <0,01) in all conditions, both pre and post intervention. In relation to [LAC], there were significant interactions between moment and supplement (p 0,026), identifying that PLA was superior to CAF in the 5th minute after HIT-test. The CAF group showed lower RPE values in the post-intervention moment (p=0,024). After the intervention, the CRE group showed improvement in PMINand PMED(p=0,008). Conclusion: Supplementation with caffeine for 6 consecutive days can generate attenuation of PSE. Creatine supplementation can improve power production in HIT-test.

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