Feasibility of an Augmented Two-Day Step Test and Causal Modeling for Post-Exertional Symptom Exacerbation in Post Covid-19 Syndrome

This is a portable mask, which is connected to the SplendoHealth app. The Polar sens 10 heartrate monitor and TrainRed NIRS device are also connected to this app. The three devices (mask, heartrate monitor and NIRS) are measuring respiratory gases, heart rate and muscle tissue oxygenation simultanuously and at the end of the 6 min step test, you get an individual cardiorespiratory fitness report.

Golden standard for measuring PEM: the double cardio-pulmonary exercise test on a bike.