Eligible subjects will be randomised, in a double-blind crossover design, to receive treatment with either nitrate rich beetroot juice (70 ml containing approximately 8 mmol nitrate - active comparator) or nitrate depleted beetroot juice (70 ml - placebo) twice daily for 7 days (treatment period 1) followed by a 7 day washout period followed by treatment twice daily with the active comparator or placebo depending on initial treatment for another 7 days (treatment period 2) .

Eligible subjects will be randomised, in a double-blind crossover design, to receive treatment with either nitrate rich beetroot juice (70 ml containing approximately 8 mmol nitrate - active comparator) or nitrate depleted beetroot juice (70 ml - placebo)twice daily for 7 days (treatment period 1) followed by a 7 day washout period followed by treatment twice daily with the active comparator or placebo depending on initial treatment for another 7 days (treatment period 2) .