Welcome to the Forum Patryk!
First the disclaimer: I am not a coach or trainer and canât see your workout stats and info - someone who is a coach and can look at your specific data and circumstances could advise you better.
With that out of the way⌠The FTP Builder plan is designed to âbuild your FTPâ. Itâs worth stating again as different plans will target different strengths or âskillsâ. Itâs not focussed for example on sprints, or long endurance. So you wouldnât necessarily expect to see benefits to âskillsâ you are not training.
Regarding max heart rate - everyone is different and lots of people find that âequationsâ or ârules of thumbâ donât really work for them. For example, a common method people suggest as an estimate is to take 220 - age. For me that would put my âcalculated max heart rateâ at 177, yet my heart rate when I just start to get into proper working at Threshold is 180 and my max is probably currently just above 195-ish. The calculation doesnât work for me. It may not work for you either. It would be better if you could have a look through your data and see what max heart rate youâve actually got to recently. Perhaps if you can narrow it down to a particular effort that you felt was very taxing, you could then target some specific activities to look at if you donât have a 3rd party service (Strava, Intervals.icu, etc.) that can aggregate that sort of data for you.
Max heart rate summary: probably better to judge this by actual values youâve recorded and how close to red line you felt when you got to that number.
Next heart rate vs. powerâŚ
My personal experience is that what Zwift thinks are my heart rate zones bears no relation to what Zwift thinks are my power zones. I train with power and just ignore heart rate, other than it serving as a quick cross-check on how much harder I can go when itâs getting hard. Maybe you are the same as me.
Next V02 max, zMAPâŚ
Unless youâve been in a lab, V02 estimates are literally âestimatesâ. They are based on the types of activities you will have been doing recently. FTP Builder plan gives you lots of foundational work and tempo by the looks of it. Thereâs not a lot of âred powersâ for example in the list of workouts. (Why would there be⌠itâs about building FTP, not Sprints!). So whatever is estimating your V02 max (Iâm assuming youâre getting it from Garmin as you mentioned that in your comment) has only seen these sort of workouts for the last 5 weeks and that is the only data itâs got to estimate with. It doesnât necessarily mean your actual V02 max is less, just the sort of data youâve been feeding the calculation recently is different to what you fed it before.
Next zFTP⌠this is the one metric that is related to the thing youâve been actually training for, although itâs still an estimate, and youâve said it has increased. Thatâs a good thing! Of course, even better would be for you to complete another ramp test once youâve finished the FTP Builder plan and are well rested. Then youâll hopefully see that your FTP has increased and your hard work has paid off.
Well done with working through the plan. Youâll know from your gym work that you train the things that you are weaker at to get stronger. It sounds like you were a bit weaker at threshold (this is horrible for everyone to be fair) and tempo work and this plan will help you get stronger at that.
I hope that helps.