1. unable or unwilling to give informed consent

2. daily use of a motorized cart

3. impairment of cognition or communication

4. history of drug or alcohol treatment within the past 6 months

5. poor peripheral blood flow to the finger rendering oxygen saturation by pulse oximetry unreliable

6. Recent acute medical events (chest pain, discomfort, etc) that would suggest a contraindication to participate at the scheduled time

AMBULATORY OXIMETRY MONITORING (AOM): a New Approach to Quantify Oxygen Desaturation in Ambulatory COPD Patients