Response of the Cardiac Autonomic Control System After Oxygen Therapy 100% in Hyperbaric Environment

Inclusion Criteria: Patients who are scheduled to receive a series of treatments at a pressure cell at Assaf Harofeh Hospital and are willing to participate in the study. Exclusion Criteria: * Patients who received previous hyperbaric oxygen therapy for any reason during the 6 months prior to inclusion. * A history of malignancy during the last year of inclusion. * A pulmonary disease that does not allow the patient to be admitted to a pressure cell (severe emphysema, moderate obstruction) . * patients that unable to sign informed consent form.