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Salivary nitrite (a) and nitrate (b) before beetroot juice ingestion and preexercise on different supplementation trials. *Different from Pre-Ing in the same treatment; P ≤ 0.002. PLA: placebo; PLA+C: placebo plus caffeine; BR: beetroot juice; BR+C: beetroot juice plus caffeine; Pre-Ing: before ingestion; Pre-Ex: before exercise. Data are expressed as mean ± SD.
