Been using TR for about 7 weeks now working through SSBMV 1&2 - enjoying my first experience of structured training. Since increasing my FTP I notice that my HR during SS intervals and threshold is now noticeably higher than what I’d typically understood to be my HR zones. Does threshold heart rate typically increase with FTP like this? I had expected HR zones to remain stable and the adjustment to be an ability to put out increased power at the same level of cardio work…Is there a typical upper limit to this LTHR increase and could I expect my max HR - which is pretty low - to increase too? (some context and additional info to follow)
Of course HR varies day to day but I’m talking multiple SS sessions where my HR sits at 153-157bpm which I’d established as threshold, and threshold intervals where it’s 158-160 which is typically my supra-threshold/VO2 max territory. I’m not getting the lactic burn in my legs that would typically be associated with above threshold work, so it appears to be some physiological adjustment rather than a bad test.
Of course a slightly too high FTP could be part of the equation - my FTP started at 341 and at the end of SSB1 had increased to 361w which may be marginally high since I’ve got a decent anaerobic contribution which helps on the ramp test. However, I’ve been able to complete all SS and threshold intervals since the increase without excessive discomfort so logically it’s not that far off.
Before getting a turbo I did all my riding outdoors and with only HR to go by so as a result have (or had) a really good handle on my zones, perceived exertion, etc… Through SSB my HR numbers were exactly within those established HR ranges excluding days with excessive fatigue/caffeine etc. For reference my resting HR is roughly 44 and max is 178 at a push.
There’s some discussion tangential to this in the below thread although I didn’t find it answered my question directly. (Heart Rate (HR) Threshold).
Appreciate your help