Peter, quick question, on your 20 point swing, did you show green on your web app as well as your phone app? Also, what is your normal HRV range?
It would make sense that your HRV was high as you were still recovering from your shift. I would have guessed it would have at least been an amber for your readiness. Remember, HRV is just one tool to help manage your training. You know that on 3 hours sleep, even if it's a good 3 hours, you should still heed caution in regards to your training.
HRV is still valid with irregular sleep cycles, as long as you are taking your reading as close to the same time each day. There's also a good chance that your ability to handle stress is pretty high, hence the high HRV score.
I work shift work as a Police officer - I wanted to use the HRV as a recovery monitoring tool.
I've just had three hours sleep and my reading is 20 points higher than yesterdays (84>104) - my readiness to train shows a green light.
I would have thought that 3 hours sleep is NOT optimal to train at maximal load / intensity....
Does shift work (with irregular sleep cycles - nothing like working consistent shift work patterns) make the HRV readings invalid?
Feedback from Howie, Joel or any who's also had this issue would be great!