I do a long exercise walk about every other day, wearing my Band 1. Sometimes my bpm shoots up to 150 and beyond during a normal walk. Of course when the band shows 150 + the calorie burn increases exponentially. How accurate can that be? I could understand running or jogging and getting those kind of heart rate readings but i want an accurate calorie burn display when I walk. So I guess I really want to know if my calorie burn readings are accurate after a long walk in excess of an hour and a half. Sometimes it reads in excess of 1700 calories burned!