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HR only goes up when I start an activity

Hi,

This is weird. When I'm doing a workout I use a chest strap that gives me an accurate reading of my HR. As I progress my hr goes up as it supposed to be. At the same time the hr on my Venu barely changes. For example, my chest strap gives me a hr of 125 while my Venu is still at 80-90. The second I also start an activity on the Venu it steadily increases to the actual value and within a minute or two the strap and the Venu are on par. 

What is this? Apparently the Venu has no problem reading my actual hr when the activity is started. Without starting an actual activity on the watch is it completely off. What's going on here? Why is not going up without the activity running?