The aim of the project is to experimentally determine the effect of the choice of finger for the placement of a pulse oximeter sensor on the results of measuring peripheral blood oxygen saturation (SpO2) in a healthy person with short-term hypoxia and hypercapnia.

The aim of the project is to experimentally determine the effect of the choice of finger for the placement of a pulse oximeter sensor on the results of measuring peripheral blood oxygen saturation (SpO2) in a healthy person with short-term hypoxia and hypercapnia. This is an intervention prospective study that will take place at the Faculty of Biomedical Engineering, especially on FBMI students. The experiment consists of two phases, in which in the first phase, the volunteers will inhale the hypoxic mixture for five minutes after the stabilization phase. In the second phase, volunteers inhale a hypoxic and hypercapnic mixture. During the experiment, non-invasive SpO2 measurements will be performed continuously on individual fingers of both volunteer hands.

Inclusion Criteria:

• Passing the initial examination, which will determine the following data: finger circumference, heart rate, blood pressure and blood oxygen saturation

Exclusion Criteria:

• post-traumatic conditions of the upper limbs affecting the perfusion of the fingers or injuries or skin diseases on the fingers.
• pneumothorax or a condition after cardiovascular surgery.
• anemia, bradycardia, hemoglobinopathy or other diseases of the cardiovascular system, pregnancy, diabetes, hypotension or hypertension.

The participant undergoes two phases of the experiment and the participant does not know which one