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Hello! I’m new to running with a Stryd power meter (2 weeks). I did a 20 minute test and used the 80/20 zone calculators to find my threshold power (296 watts) and threshold pace (8:52) values. It seems like my Z4 power and Z4 pace conflict with one another.
Last week during my RSP9 workout, I ran eight one-minute sprints at Z4 power (305-355 watts). My pace ranged from 6:04-6:14 mins/mile. But based on my running threshold zones (calculated from the same 20-minute test), my Z4 pace should be 7:43-8:42 per mile. I’m concerned that I’m overexerting myself trying to run in my Z4 power range. Any thoughts, suggestions, advice?
Edit: My power averages for eight one-minute sprints at Z4 power were from 301-309 watts, so I was barely hanging on!
M,
There is a device calibration issue here. Just look at the data at hand.
Workout 1: 296 watts equals 8:52 pace
Workout 2: 305 watts (9 watts higher) equals 6:14 pace (2:38 faster)That’s a 3% increase in power leading to a 42% increase in speed. It’s not possible.
In other words, forget zones altogether, pretend zones don’t exist. You can’t get a 42% increase in speed from a 3% increase in power. The data in either Workout 1 or Workout 2 is wrong.
David
Thanks for your reply, David! If it’s a potential device calibration issue, should I reset my Stryd and redo the 20-minute test? I made sure that the firmware was updated before using it. I’ve included my file for the run test.
https://home.trainingpeaks.com/athlete/workout/YNGJSH56LAUZVTI4FEYTRMETSU
@maroda – make sure you did not change your weight in Stryd settings. You should never change it, otherwise all the W calculations go south.
@MatCat is right on, that’s one possibility. We had an interesting thread here where an athlete’s power data was just all over the place. Turns out their Bluetooth scale was sending weight data to Stryd and updating it constantly.
My next response was going to be…”you can really only compare Pace and Power when running outside on a track…” and do a mic drop and end the thread. But, then I checked your run data and… it was done outdoor on a track. Dang it. That eliminates a lot of issues. I’m not familiar enough with Stryd to determine calibration settings.
Frankly. I’d take this straight back to Stryd and let them try to explain it. “How can I get a 42% increase in speed with a 3% increase in power?”
David
Here’s the RSP9 workout:
https://home.trainingpeaks.com/athlete/workout/F6QQCVSCH7W5BTI4FEYTRMETSUThank you, @MatCat and David. I *may* have messed with my weight setting in the Stryd app, between those two runs. I’m going to just retest and hope that it solves the issue. I’ll report back any additional findings or conclusions.
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