Skip to main content
. Author manuscript; available in PMC: 2008 Feb 22.
Published in final edited form as: Pharmacol Biochem Behav. 2006 May 2;83(3):441–447. doi: 10.1016/j.pbb.2006.03.005

Fig. 1.

Fig. 1

Cortisol concentrations in saliva. Cortisol concentrations in saliva collected from women and men on days when they were administered capsules containing caffeine (250 mg × 3) or placebo, shown by arrows, and underwent either mental stress testing or bicycle exercise before consuming a noon meal. Stress refers to the time of mental stress or exercise. Meal refers to time of midday meal. Axis labels refer to protocol timepoints when saliva was collected: C60=60 min following morning placebo or caffeine intake. PostStress = immediately at the end of mental stress or exercise. Post+40=40 min after end of stress. PostMeal = immediately following midday meal. 6 p.m. = 6:00 p.m. at home. C+60=60 min following third caffeine administration of the day. Asterisks indicate significant differences between placebo and caffeine based on 1-tailed, paired Student's t test with Bonferroni correction and significance set at p<.05.