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Beetroot juice is a naturally rich source of inorganic nitrate (NO ₃ ⁻ ), a compound hypothesized to enhance endurance performance by improving exercise efficiency.

To investigate the effect of different doses of beetroot juice on 2000-m ergometer-rowing performance in highly trained athletes.

Ten highly trained male rowers volunteered to participate in a placebo-controlled, double-blinded crossover study. Two hours before undertaking a 2000-m rowing-ergometer test, subjects consumed beetroot juice containing 0 mmol (placebo), 4.2 mmol (SINGLE), or 8.4 mmol (DOUBLE) NO ₃ ⁻ . Blood samples were taken before supplement ingestion and immediately before the rowing test for analysis of plasma [NO ₃ ⁻ ] and [nitrite (NO …