well there are a lot of things that could cause this to happen. in fact when people who are really out of shape exercise vigorously and get extremely winded they probably are experiencing exactly the symptoms you describe. it would not necessarily be abnormal. many heart conditions can cause the symptoms you describe. when i say "heart conditions " i'm including a broad range of diagnoses from heart failure to arteriosclerosis. related conditions such as morbid obesity probably could cause heart rate acceleration and oxygen desaturation on exertion too. if you're experiencing these symptoms on a regular basis you should check with a health care professional to get a work-up. it would be a good idea to make sure your ticker's in good shape. wishing you well!
what would cause oxygen saturation to drop and heart rate to spike with very mild exertion?