Fig. 2From: Acute effects of coffee consumption on self-reported gastrointestinal symptoms, blood pressure and stress indices in healthy individualsSalivary cortisol (a) and salivary alpha-amylase (b) concentrations per time and per type of coffee in healthy participants under non-stressful condition (n = 40). Data are means ± SEM. An asterisk indicates a statistically significant difference between the test coffee groups (P < 0.05)Back to article page