I have recently started a marathon training program using heart rate zones. I've been surprised at some of the heart rates displayed on the watch as they didn't tally with how I felt, but I could not tell if they were correct or not.
Today I wore the watch on a treadmill with HRM in the handles. This confirmed that the watch was seriously wrong for much of the run. My first 15 minutes was a warm up - easy pace and little effort. Treadmill said HR of 110-115 bpm. Watch said 145-155!!
After about 15 minutes the watch then matched the treadmill - and how I felt!
So, the questions are:
- Is there anything I can do to ensure better accuracy of the watch
- Is it best to buy a chest strap to pair with the watch?
Thanks in advance.