Screening for Individual Susceptibility Factors to Immersion Pulmonary Edema

"At visit 1 (Day 0), an exercise test will be performed (maximal incremental test), followed by a 30-minute submaximal exercise at constant load.~During this exercise, continuous data collection will be performed:~* Continuous 12-lead electrocardiogram~* Continuous monitoring of blood pressure and ventilation."

"At visit 2 (Day 7), the subjects will perform a swimming exercise in the experimental pool equipped with a turbine to create a counter-current. The water speed will be constant (4 min per 100 m, i.e. 1.5 km/h). The duration of the exercise will be 30 minutes. Each diver will breathe with the help of a snorkel.~During this exercise, continuous data collection will be performed:~* Continuous 12-lead electrocardiogram~* Continuous monitoring of blood pressure and ventilation."

The participants will have a transthoracic cardiac ultrasound to measure the dilatations of the cardiac cavities at visit 1 and 2.

The participants will have a transthoracic pulmonary ultrasound to quantify the presence of signs of pulmonary vascular overload (comet tails) at visit 1 and 2.

Several blood samples will be collected at visit 1 and 2.