The goal of this observational study is to learn about heart rate variability and physical activity in inpatients with stress-related disorder. The main questions to answer are: * whether heart rate variability shows the severity of certain symptoms. * whether physical activity has an influence on heart rate variability and symptoms of stress-related disorder. Participants will be asked to take part in 5 examinations during their up to 8-week inpatient treatment: * Participate in an interview * Measurement of heart rate variability, blood pressure and health of the arteries (pulse wave velocity) * Tests of endurance, strength, balance and cognitive abilities * Completion of two additional short questionnaires * Wearing a 24-hour electrocardiogram * Wearing a fitness watch and daily self-assessment of fatigue, mood and tension via an app on participant's mobile phone during their stay.
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Change from Baseline Orthostatic Test Heart Rate Variability (HRV) at 8 weeks.
Timeframe: Orthostatic Test HRV will be measured in the first and last week of up to 8-week inpatient treatment.
Change from Baseline 24-hour Heart Rate Variability (HRV) at 8 weeks.
Timeframe: 24-hour HRV will be measured in the first and last week of up to 8-week inpatient treatment.
Change from Baseline Exercise Test Heart Rate Variability (HRV) at 8 weeks.
Timeframe: Exercise Test HRV will be measured in the first and last week of up to 8-week inpatient treatment.