I have a Tacx Vortex Smart trainer and a Wahoo Tickr heart rate monitor connected to my Macbook Pro (OS Catalina). I’ve been doing workouts on Zwift since around 2 months ago. I did an FTP test back then and got an FTP of 255w. I trained three times a week and a month later, I did another FTP test: my ftp increased to 295w. That’s when I realized there’s something wrong with the power readings. Today, when pushing 250w for 10min, my heart rate was very high and I was exhausted. A week ago I pushed 290w and I could still talk to my girlfriend while doing so. Also, since today, the cadence readings are off too. I knew I was doing around 90rpm, but Zwift showed around 120rpm, and it also jumped a lot…
I’m using a trainer tyre with a pressure of around 100psi / 7bar. I’m using the Tacx Utility app on my iPhone to calibrate. When I put tyre resistance is in the exact middle, I feel it is slipping a lot. So I tighten it a bit, so the calibration is more to the right, but still in between the two white lines.
It is a frustrating experience as I don’t know what is correct and what not. The only thing I’m pretty sure about is my heart rate. But now I don’t how to organize my workouts anymore, as I don’t know my FTP because of the weird readings.
Anyone having similar issues? Or does anyone have an idea what might be the issue here?