This is part three of a three-part article. Click here for part 1: "Altitude & Oxygen Levels." Click here for part 2: "Using Your Own Oximeter." To read the entire article on PERF's main website, click here. By Mary Burns, RN, BS PERF Executive Vice President Those of you with restrictive disease will find that your oxygen saturations may plummet with activity if you don't carefully pace yourself and practice good breathing techniques.