Thanks Randy.
One thing I forgot to put in the blog (I'll go back and edit it) is the unexpected impact on my max Heart Rate.
Those who have seen me race know that my heart rate is relatively low - I had it pegged as a max of 158 BPM and I rarely even managed to get to that level.
Since coming back from my enforced time off the bike (or any training really) my max HR now on the bike is 165BPM - and I've not really stressed it quite to 100%.
Prof Louis Passfield mentioned that his HR was higher (he's also recovering) and I asked him why. He said..
" Your heart rate is determined in part by the extent to which your heart fills between each beat. If your blood volume increases, your heart fills more effectively and your heart rate decreases. The opposite also applies and a decreased blood volume can lead to an increased heart rate response. If you haven’t trained for a while your blood volume is likely to decrease, and your heart rate increase. This is a brief answer as there are lots of other factors at play here too. When you resume training your blood volume can increase quite rapidly and you can see a drop of 3 to 5 bpm in max heart rate within days before it stabilises."
I had always thought that max HR was find of a fixed thing and as your blood volume increased this provided the performance boost as more oxygen is available.
I am hoping that the new max HR stays available to me as my blood volumes increase with training, but we'll see.