Dynamics of the salivary cortisol concentration (nmol/l) over a two-hour period (T0–T5) in the control group and both stress subgroups.

<p>Group S1 showed no significant increase in salivary cortisol concentration. Group S2 showed a significant increase in salivary cortisol concentration at T1, T2, T3 and T4 compared to the control group (T0: F = 2.01; p = 0.142; T1: F = 10.23; p<0.001; T2: F = 19.77; p<0.001; T3: F = 42.15; p<0.001; T4: F = 19.16; p<0.001; T5: F = 0.189; p = 0.829 ANOVA group interaction). For further description, see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0051323#pone-0051323-g001" target="_blank">Fig. 1</a>.