I have been monitoring my resting Heart Rate almost every morning for a few months now and the results seem a bit unusual. There has been a general downward trend (down to 42 on a low day), but the results vary dramatically between 42 and 53. I know that a higher than average resting heart rate can be a sign of over training, but there does not seen to be a correlation between hard riding days and increased Heart Rates.
Any Ideas?