As there is a different atmosphere in the chamber (different content of oxygen, carbon dioxide, hydrogen, and, primarily, different pressure) than outside, when you enter a session and end it, you have to spend a few minutes in the lock. This is necessary for the ambient conditions to equalise. This is the only moment during the session, when you might feel some discomfort – the pressure will change, it will be increased when you enter the normobaric chamber, and it will drop when you exit. There are persons that feel no change – just like in case of air travel, however, there are those who will notice the difference. For instance, if you have an inflammation of the sinuses, you might feel discomfort in your ears. Naturally, this is no hindrance against a session in the normobaric chamber, and you can handle the discomfort itself by various means – perhaps you know them from air travel already:
- take along a bottle of water that you will slowly sip, and/ or bubble gum or a piece of favourite hard candy. This should be sufficient in most cases;
- close your mouth, close your nose tightly with your fingers and blow the air out through your nose. Repeat this until you hear the characteristic ‘pop’ sound of your ears becoming unplugged,
- close your nose with your fingers tightly and swallow your saliva. If you have travelled by plane with children, then you definitely know this simple yet effective method. It also works the same for adults;
- mix the above two methods: close your mouth, close your nose, blow air out through it, and at the same time – swallow your saliva.