I'm in my second week of my marathon training and today I had my second threshold training.
So where my normal workouts are mostly of moderate intensity, these threshold training's have a high intensity interval. I was able to go above it during my Assessment Workout and I managed to stay in the Yellow Zone for 5 minutes last week.
However, this time half way through my Yellow Zone I had a nasty encounter with the Man with the Hammer. I started to hyperventilate and wasn't able to go any faster, I did my best to at least not slow down any further but failed miserably. After that it took nearly 5 minutes before my breathing rhythm was restored to something normal.
I hadn't eaten in a couple of hours, like I have done before all my workouts, nor did I feel a lack of energy, such as light headedness. I drank 0.5l of water before so I wasn't dehydrated either. I also felt pretty good until I had to accelerate towards the Yellow Zone, so it really feels like it came out of nowhere.
In grad school I had a VO2max test, which also showed that my ventilation, rather than my heart rate was my main limiting factor. But while it was to be expected, I don't understand why it would be hitting me so early on. Granted, I've only started running again 10 weeks ago and all those workouts maximally went to the Green Zone and lasted no longer than 30 minutes. But I'm flabbergasted that I couldn't even maintain 170 BPM...
So now I'm wondering why I got hit with the Man with the Hammer and what I should do to avoid it next time.