Hi, I'm a competitive runner and a few weeks ago decided to start static apnea training to see if it would help increase my running performance. I used to to a little free-diving years ago and had a dry static pb of 5:30. With a couple weeks of starting some CO2 tables I've now done a dry static of 6:15. I've been mostly doing CO2 tables based on 50% of my PB 3 or 4 times a week and recently started doing the O2 table. My question is this. Last night before bed I did the CO2 table and it was fairly challenging as I had eaten dinner only about an hour before. And then this morning at 6 I did the O2 table, which was moderately difficult to complete. However, at 9 I had a challenging running workout to perform. I was wearing a heart monitor and I noticed as I was doing my easy 5k warm-up run my HR was about 15bpm higher than usual. And when I started my workout I was only able to complete 75% of it before my HR went too high and I became exhausted. Besides my HR going out of control I thought I should have been able to have finished the workout without any major issues. Could the consecutive tables I did last night and this morning have been a factor for my apparent lack of cardio in this workout? Am I best not to do apnea training before hard running workouts or races? Thanks for any input, I suspect I will have to respect the static apnea training more though as far as it creating an additional significant training load on my body!