Note that I’m scheduled for a health test soon so I don’t assume TR users to diagnose me in place of a professional but was just wondering if anyone experienced the same issue as I did when training a few days ago:
The workout was Kosciuszko (VO2 Max 8.4 Progressive) and I added an extra 5 mins warm-up time.
The first interval was 295W for 5 mins - my FTP is 274. It felt a lot harder than 295W and later I did a diagnostic & battery check on my Stages SB20 and it appeared my batteries were low (2.7v vs 3.3v for a fresh battery) even though I had only changed them a month beforehand.
So my assumption is that I was putting out more wattage (felt like > 400W) than was actually being displayed.
About two-thirds of the way thru the interval my power started to drop and I simply could not hold the required power.
I suddenly got dizzy at the end of the interval and had to dismount and lie down.
My heart felt like it was really pounding in my chest - it didn’t feel like a really high rate (my max is 173), moreso a very intense/strong beat.
I had to lay there a few mins to recover, wondering whether what I experienced was a heart palpitation or something similar…
I only had my breakfast approx 15 mins before the workout (I’d usually have it several hours beforehand) so I this was probably not long enough possibly to absorb breakfast to get the energy availability.
I decided to get back on the bike and try finish the workout.
The second interval felt pretty tough so I horsed an energy gel into me.
I started to feel better pretty quickly.
I was able to complete the full workout and also to hit a 5 min power PR on the last interval (hit 350W vs previous season best of 311W), not sure why I tried for a PR - maybe as a “stress-test” to see if the initial issue reoccurred.
As a result of being able to complete the full workout, I was less concerned about the initial issue I experienced, and believe it was more related to an energy deficit vs a cardiac issue.
Anyway - just wondering if TR users have experienced something similar beforehand to see if this is a more common occurrence than I’m aware of - thanks!