Agreement Between 5 Different Pulse Oximeters Used Simultaneously During a Six-minute Walk Test

This study aims to compare the results obtained during a standardised 6-minute walk test with five different pulse oximeters, in adults admitted to an outpatient pulmonary rehabilitation program, to determine the agreement between devices of current use for measuring oxygen saturation (SpO2) and identifying subjects with desaturation during the test.

Inclusion Criteria: * All patients referred to our Cardiorespiratory Unit for a pulmonary rehabilitation programme * Aged over 18, no maximum age limit * Absence of language barriers or cognitive impairments that would make it impossible to explain the protocol * Resting SpO2 \> 90% * Signing the informed consent form after receiving detailed information about the study. Exclusion Criteria: * Any clinical condition that makes it impossible or compromises the performance of a walking test: unstable heart disease, acute myocarditis and/or pericarditis, acute arrhythmia, severe pulmonary hypertension, deep vein thrombosis, severe asthma, acute orthopaedic or rheumatic condition * Unstable clinical condition (patient hospitalised or less than 4 weeks after an exacerbation leading to hospitalisation) * Oxygen therapy at rest and/or during walking * Uncontrolled arterial hypertension (AHT) at rest * Known cardiac rhythm disorder * Unexplained chest pain at rest * Mechanical interference with the possibility of placing pulse oximeters: skin lesions, bandages, plaster casts, etc. * Withdrawal of consent during the study * Systemic scleroderma, sclerodactyly, history of any type of vasculitis * Symptomatic Raynaud's phenomenon * Marked clubbing * Known haemoglobinopathy * Refusal to remove nail polish