Analysis of Muscle Oxygen Saturation and Functional Variables During Physical Capacity Assessments in Patients With COPD

This experimental pre-post study investigates the effects of a combined respiratory physiotherapy and physical training program on muscle oxygen saturation and functional capacity in patients diagnosed with Chronic Obstructive Pulmonary Disease (COPD). COPD is a highly prevalent condition with a progressive impact on functional capacity, muscle performance, and quality of life. It is associated with systemic repercussions, including skeletal muscle dysfunction and oxygen transport limitations, which impair tolerance to physical activity.

The study will evaluate the acute and cumulative effects of a structured, supervised intervention including respiratory physiotherapy techniques, cardiovascular training, and progressive resistance training. Measurements will be taken before and after the intervention period to assess changes in muscle oxygen saturation-measured using near-infrared spectroscopy (NIRS) devices (Moxy Monitor)-in key muscle groups (intercostal, quadriceps, and triceps surae).

Functional capacity will be assessed using the 6-Minute Walk Test (6MWT) and the 30-Second Chair Stand Test (30CST). Additional variables including inspiratory and expiratory pressures, pulmonary function (FEV1/FEV6), heart rate variability, dyspnea, lower limb fatigue, and quality of life (COPD Assessment Test) will also be recorded.

The intervention consists of 20 hospital-based sessions over four weeks (five sessions per week). The protocol is designed to reflect real clinical settings and aims to provide evidence for the feasibility, safety, and functional relevance of combining respiratory and musculoskeletal rehabilitation strategies in COPD patients.

Inclusion criteria

• Age ≥18 years
• Clinical diagnosis of COPD
• Medically cleared for physical exercise

Exclusion criteria

• Decompensated heart failure or exercise-limiting comorbidities
• Cognitive impairment or legal incapacity to consent
• Inability to perform physical tasks