Disease-related Fatigue Monitoring Based on Body Signals Measured on the Skin

Respiratory training will be included in the rehabilitation program of a subgroup of post-COVID-19 patients. The intervention group will train twice daily for the length of their rehabilitation stay using an incentive spirometer (Voldyne 5000 R, Sherwood Medical, St. Louis, USA). Subjects will be instructed to first completely exhale slowly. Then inspire slowly up to 70% of their vital capacity, producing a constant flow controlled via feedback from the device. This procedure will be repeated every 30 s (paced by a metronome) for 15 min. The training will be conducted twice a day, resulting in a total of 60 inspirations per day.