COPD exacerbation.

Active cancer or a history of cancer within the past five years.

Musculoskeletal disorders preventing independent movement and participation in exercise tests and training included in the study protocol.

Recent (within six months) surgical procedure or trauma to the chest, abdomen, skull, brain, or eye area.

Severe valvular heart disease.

Implanted cardioverter-defibrillator.

Diagnosed arrhythmias posing a risk of loss of consciousness.

Acute coronary artery disease.

Epilepsy.

Uncontrolled arterial hypertension despite medication.

Primary or secondary immunodeficiencies.

Respiratory failure requiring chronic or intermittent oxygen therapy.

Infectious diseases with fever during the experiment or within two weeks before the study.

Claustrophobia.

Pregnancy.

Simultaneous participation in another rehabilitation program.

Significant changes in pharmacological treatment during the study.

Pulmonary Rehabilitation in Salt Chambers for Patients With COPD