I just started using this heart rate monitor, with the strap around the chest and the watch that you wear. I cant help suspecting that its just following my strides on the treadmill though, and also, if this is possible? How accurate are these monitors anyway, and how do they work? The treadmill speed was exactly 4mph just an average walking speed. I was doing roughly 2 steps per second at this speed, and then I noticed that my heart rate was consistently reading about 110-115bmp, --roughly the same number as my steps per min. Wouldnt a step cause the same amount of vibration that the strap picks up?