Figure 1

Salivary cortisol (ng/mL) and salivary alpha-amylase (U/mL) among men administered no caffeine, 200 mg or 400 mg of caffeine at baseline (before caffeine administration) and recovery (15 min following cessation of air traffic controller) (unadjusted means + SEM). (A) Mean salivary cortisol levels (B) mean salivary alpha-amylase levels.