Three-min Step Test and Exercise Desaturation Detection in Chronic Respiratory Insufficiency Patients

Ability of the 3-minute Step Test Protocol for Detecting Exercise Desaturation Episodes in Chronic Respiratory Insufficiency: Protocol STEPSAT: Three-min Step Test and Exercise Desaturation Detection in Chronic Respiratory Insufficiency Patients

The study project will aim at the evaluation of the occurrence of exercise desaturation phenomenon during two different modalities of exercise (walking and stepping condition). This study will allow determining the sensibility of the 3-minute step test to detect exercise desaturation, in comparison with the gold standard (6-minute walking test). The 3-minute step test could therefore appear as a complementary tool for the evaluation of oxygen desaturation in chronic respiratory disease.

The 6-minute walking test is currently the gold standard for the evaluation of oxygen desaturation phenomenon during exercise and for the adjustment of O2 flow rate. But, due to spatial constraints, this test remains difficult to apply in ecological conditions and the 3-minute step test could be a complementary method to the walking test for the evaluation of chronic respiratory diseases. For this study, patients will perform, during 2 visits, a maximal graded test and two field tests (6-min walking test and 3-min step test) under identical conditions. During these tests, pulsed oxygen saturation and psycho-physiological adaptations to exercise will be monitored.

Inclusion Criteria:

• Patients aged by 18 and more ;
• Patient with an chronic obstructive respiratory insufficiency, confirmed by clinical and functional criteria ;
• Patient with exercise-induced oxygen desaturation ;
• Patient clinical ly stable, with no exacerbation period within the last 2 months before inclusion ;
• Consent form signed by the patient.

Exclusion Criteria:

• Patient in exacerbation period at the inclusion time ;
• Pregnant and breastfeeding women ;
• Patient with orthopedic disorder that could limit the ability of stair climbing;
• Any other disease that could influence exercise capacity of the patient or that could impair exercise test realization ;
• Patient with law protection (guardianship or protection of vulnerable adults)