Functional Threshold Power (FTP) Test
I did some sleuthing last night to try and solve by bluetooth sensor drop-outs and discrepancy between the power meter and Zwift. Re-read the instructions and realized the weight on the power meter was suppose to be my weight + the bike weight. It did bring them closer, but it was still drastically different. My UIL confirmed that the power meter is rather untrustworthy and that in his experience he found Zwift to be more realistic. So I'll go with that!
The next issue was the bluetooth sensor drop-out. I read online about some potential issues. The phone to close to an LCD, wireless internet interference at 2.4GHZ, physical obstruction between the phone and sensor, and three bluetooth devices might be too many (RPM, cadence, and HR). So to alleviate these issues:
-I moved the phone to the ground (away from the LCD, closer to the sensor, and without physical obstructions).
-I changed the phones wireless to 5GHZ instead of 2.4GHZ.
-I chose not to use the HR monitor for this ride to ensure higher accuracy on the FTP test.
-Restarted my phone
The first hiccup of the day was a poor connection between the Apple Lightning HDMI connection to the TV. After a few attempts, I was able to get it to work. Since Steph was at work, G was going to be my spectator for the ride.
So, the plan was to do a FTP test. This will help setup training zones for my upcoming short 6 week training plan. (
Link)
I uploaded Zwift and was on my way.
Cadence was around 70 rpm for most of the warm-up. Didn't really know what to aim for since this was all new to me. G kept yelling at me throughout the entire WU because other riders were passing me. She thought it was pretty cool to have a workout video game. But seriously Dad, they're passing you! Catch up!
After the WU was done, it was time for the real test. A 20 min ride effort that was to be at a maximal effort for the entire 20 min duration. Try and hold a consistent wattage from the beginning to the end.
So I shifted the bike into a gear with more resistance and started to pedal hard. I wasn't really sure what I could keep up for 20 min. So I just kept pedaling hard. For the first 6 minutes, my cadence was relatively consistent (85-90 rpm) and the power increased from 200-333 watts.
After about 6 minutes, things started to level off. I held about 330-350 watts for the next 10 minutes (6 to 16 min) at about a 90-95 cadence. With about 4 minutes remaining, I could tell my cadence was increasing towards 100 rpm. So I decided to kick it up another notch and switch to another higher resistance gear.
Immediately, the wattage jumped up to 400-420 watts with the cadence holding steady around 90 rpm. I was really starting to feel it here at the end. I didn't have much left. I started to fade a bit and settled in at 380-390 watts. That clock was tick, tick, ticking down. And G was constantly yelling at me to keep it up. Wasn't having to worry about getting passed at this moment since I was doing quite well. Wrapped it up and I was exhausted.
Finished with a FTP of 299 watts (average power during the 20 min test was 315 watts). This gave me a 4.09 watts/kilogram assessment on my FTP.
Per this chart, that puts me around a "Good - Category 3".
My thoughts on the test overall. I did a pretty poor job of having a consistent wattage from the beginning to the end of the test. Ranging from 200-420 watts is a really wide range. But I think having a baseline like this will give me a good place to work from. I think I didn't have enough warm-up and will need to do the full FTP test next time (more WU). I also think having the knowledge of how the test went will allow me to perform better the next time around. I've got a feeling I'll end up somewhere closer to a 350 watt average (or FTP of 332 (95% of average of 20 min) and ratio of 4.55 or Very Good - cat 2), but I'll stick with 299 since that's what I earned.
The power meter was WAY off as I was consistently in the 600s for wattage which would be insanely high.
Now here's the thing. My plan is to only indoor bike. I'll use the same setup, same bike, same trainer, etc. So what I need is the setup to be precise (consistent), but it doesn't have to be accurate. My real FTP could be 200 or 400, but as long as I stick with the same setup then I can stick to the values it gives me. It just requires a consistent output from the setup. Which means I'll be training at the correct effort level (% higher or lower than FTP) appropriately regardless of the accurate value.
I didn't have any drop-outs during the 20 min test which was nice, but I did have several during the cool-down. Still working through that.
Overall, I'm happy with how this went. It was a good strong workout. Now time to keep building from here. G had a great time as well which is nice given we'll be doing this a few times a week. I'll add the HR monitor back and see if I can keep the drop-outs down. Excited to see how this plays out over the next few weeks.