Fig. 1From: Psychosocial stress induction in vivo vs. in virtuo and the influence of a health app on the acute stress reaction in youths: a study protocol for a randomized controlled trialOverview of study design. HCE, Heart Coherence Exercise; NR, Natural Relaxation; TSST, Trier Social Stress Test; TSST-IV, Trier Social Stress Test in vivo; TSST-VR, Trier Social Stress Test in virtual realityBack to article page