I commuted to Purdue today by bike, and man is my fitness down. Total of 18 miles today (I had to also go get a CT scan on my chest, following up on my pneumonia episodes), and I am absolutely trashed tonight. Now, I did do it on my fixed gear, so I have to work, even on the downhills to manage my speed.
On the uphill, though, I did have a concern......I wound up punching the ol HR up to about 190, and I can't do that anymore, it seems. I thought I was going to have an issue.....I could literally feel the Atrial Fibrillation starting in.....3 beats-skip, 3 beats-skip.
It did settle back into a normal rhythm, as far as I can tell from the pulse, though,, it's back to steady, and a reasonable rate.