Been doing TR for about 5 weeks, I calibrate before every ride. One thing I’ve noticed is that my actual power usually hovers at exactly 1 number below the target. Sometimes it’ll be on the target (it’s always on target on my Garmin Edge), but when each interval finishes, my overall power reading is again always 1 number short of the target.
I’m guessing this doesn’t really matter, but still kind of annoying to see. Is this just some glitch or does this actually mean something? This happens at every power level so it’s not just targets that are difficult to hit. I online chatted with a TR rep about it but it didn’t seem to be a problem anyone’s ever brought up much and they didn’t think it was much of an issue.
Is this with ERG mode? I notice something similar on Zwift. If my target wattage is 230, it will typically settle out to 229. Sometimes hitting the “true” number, sometimes a little over, but almost always 1 watt below. I always assumed it’s something to do with the way the trainer works.
It is with ERG mode, I have a Kickr as well. It happens no matter what (ramp or no ramp) except those short intervals where I’m ramping down, because the wattage starts out higher than the target and remains that way as it ramps down.
I have a wahoo Kickr bike. I just looked at a workout from last week it looks like I had the same thing. It’s definitely not something that I’ve paid much attention to. I’m sure I’ve noticed occasionally during a workout. But never gave it much thought
There’s always a ramp, you don’t go from say a rest interval to a VO2 max interval wattage instantly even if the target changes instantly.
Beyond that I also do find that my steady state power is often a watt lower than the target in Erg. The power you see in Erg is still pretty heavily smoothed and your real power is more variable than you’re seeing. I don’t know if it’s something KICKR specific but I think it errs ever so slightly on the side or caution as it tries hold the erg target in the face of human variability.
At the end of the day it’s really nothing to worry about, but I sometimes wonder if maybe it’s a display or rounding issue within the app during the session.
I’ve seen that in the past as well (target to actual off slightly), but when I go into the web app after the session to analyze the ride, the target to actual numbers are slightly different and in many cases MATCH!
I see the same thing with my Tacx trainer in ERG mode, and I’m sure it’s due to the few seconds lag while the trainer ramps up to target. It lags a bit on the way down as well, so the recovery intervals usually end up a little bit high. In other words, it’s mostly just shifting the interval a little bit out of the window shown on the graph. It’s more pronounced on shorter intervals than longer, and where there are big jumps up or down.
That said, I set the app at 101% for workouts with long intervals, 105% for ones with short bursts, and 102% for those in between. Even though I know full well that a few watts (or secomds) one way or the other makes absolutely zero difference whatsoever in training effectiveness, I still just can’t stand seeing the “official” intervals come up even 1 or 2 watts short!
indeed in spite of the prescribed target on screen being a set number we are working in zones. that being said i find the same frustration with my Saris H3 tending low to target in erg mode so when I do use erg I use the manual offset and when it really matters I just use standard mode.