Having decided to train properly this winter I have changed my diet (loads more protein), upped my sleeping (just by being disciplined) and have a written training plan.
I have also noted that many people recommend recording HR first thing in the morning and using it to assess freshness, etc. I did not want to buy a heart rate monitor but found that there a multitude of apps on the iPhone which use the flash and the camera as a simple pulse oximeter.
So I have been doing this for the last 3-4 mornings with reasonably steady HR. This morning I noticed it was about 8 beats higher than normal.
Got through to do my workout and the legs just did not want to work. Abandoned after the first set. The I thought about my raised HR?
Pure chance association or useful adjunct to training with a useful predictive role? I don't know . Anybody else any experience with early morning HR recording?