COPD (Chronic Obstructive Pulmonary Disease) is a disease of the respiratory system characterised by irreversible airway obstruction of varying severity. The disease (known as COPD, Chronic Obstructive Pulmonary Disease) is progressive and is associated with a state of chronic inflammation of the lung tissue, which leads to a real remodelling of the bronchi causing a significant reduction in airway flow. Among the possible treatments, while the placebo is considered as an inert treatment, lacking any intrinsic therapeutic properties, there is evidence in the literature that not all placebos are equivalent and some are more effective than others, as for example in the case of migraine or osteoarthritis. The differences found between different types of placebos (e.g. oral, subcutaneous, intra-articular...) indicate that placebos are not inert but rather consist of multiple psychosocial elements that are part of the ritual of the therapeutic act. This is also the context for the studies by Lacasse et al. (for the International Nocturnal Oxygen (INOX) Research Group et al., 2017) and Jarosh et al., who investigated the effects of oxygen therapy both during sleep and during the course of daily life, studying its influences through the use of placebo in patients suffering from hypoxemia. However, in the literature, there are no studies investigating the role of oxygen (O2) during the performance of a test such as the Walking Test, otherwise known as the 6 Minute Walking Test (6MWT) compared with a placebo in patients with Chronic Obstructive Pulmonary Disease (COPD), nor whether the use of the latter would lead to comparable results.

Inclusion Criteria:

• Subjects who voluntarily agree to participate in the study;
• Subjects with moderate-grade Chronic Obstructive Pulmonary Disease (COPD) (GOLD 2-50% ≤ FEV1 <80% of predicted) according to GOLD criteria;
• Subjects undergoing treatment with oxygen therapy and non-smokers;
• Ex-smokers
• Outpatients and inpatients

Exclusion Criteria:

• Refusal of Informed Consent
• Severe cognitive impairment, detected by administration of the Mini Mental Status Examination Test (MMSE)
• Pregnancy
• Patients with oncological or psychiatric pathologies
• Main immunodepression

It is foreseen that the professional (Psychologist other than the one involved in the administration of the tests inherent to the assessment), once the patient has been identified, proposed the study and the readiness to manage the eventual episode of acute respiratory infection, and obtained his consent, will use the results of the above-mentioned system to assign the participant to one of the two groups and therefore to the order of conditions. In this way, the physiotherapist performing the planned treatment, the psychologist involved in administering the psychological assessment and the physician performing the respiratory function tests will be excluded from the randomisation process and blinded to the treatment.