Taking a specific amount of arginine supplement for just three days doesn’t change the levels of nitric oxide in the blood of highly trained male athletes when they do short, intense workouts.

A study where well-trained male athletes receive 6 g/day of arginine or placebo for 3 days in two separate phases (with washout), and plasma nitrate/nitrite levels are measured during standardized intermittent anaerobic exercise sessions. Primary outcome: change in plasma nitrate/nitrite from baseline to post-exercise under each condition.

A study comparing two groups of well-trained male athletes: one receiving 6 g/day arginine for 3 days, the other a placebo, with plasma nitrate/nitrite measured during identical anaerobic exercise sessions. Primary outcome: difference in post-exercise plasma nitrate/nitrite levels between groups.

A study measuring plasma nitrate/nitrite levels in the same group of well-trained male athletes before and after 3 days of 6 g/day arginine supplementation during identical anaerobic exercise.

A study observing naturally occurring arginine intake patterns in well-trained male athletes and correlating them with plasma nitrate/nitrite levels during anaerobic exercise.

A report of plasma nitrate/nitrite responses to 6 g/day arginine for 3 days in a small group of well-trained male athletes during anaerobic exercise, without control group.