Subject: Feedback on Zone Sense accuracy: Short intervals and Zone 2 threshold shifts
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@sky-runner There is something strange here. I rarely get an LT threshold from ZS, only when I am doing Tempo (at my LT) intervals or running intervals (above my LT). I do not get LT thresholds with typical Endurance runs done mostly in Zone2 with some Zone3.
As I have stated before my AT threshold will differ by a lot, when fresh it equals my lab-based number, done when I was well rested but when training hard my AT can be near the bottom of Z2 for me, which makes total sense as I am fatigued.
Again, I don’t think ZS should be used to set your zones unless you have a lot of data. I do not change my zones based on ZS predictions but I find ZS helpful in real time as:- Keep me from going to hard early in a long run/race as I feel good.
- To go harder on long training runs when I might slow down as I am getting tired.
To conclude, there is something wrong with your data, using ZS for a long time I have never seen what you show here. I do not know what HR belt you are using. Moreover, I don’t think that the discussion on ZS should be primarily on where zones are predicted.
Vector/T6c/Vertical 2 Ti
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@sartoric How do you do ?
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A simple copy-paste? Seriously? That’s it
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In the areas where Zone Sense marks the curve in red (anaerobic), I was clearly in zone 3. I could count or recite the alphabet without any trouble, yet the watch showed me at the absolute limit of the red zone.
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@Dieter1960 VO2M in ZoneSense VO2M spans from your LT to your max, so potentially a large range. You could be right at LT with red ZoneSense and would be able to say a few words.
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@Dieter1960 said in Subject: Feedback on Zone Sense accuracy: Short intervals and Zone 2 threshold shifts:
In the areas where Zone Sense marks the curve in red (anaerobic), I was clearly in zone 3
Today ZoneSense determined my LT (anaerobic threshold) at 131. That is the bottom of my Z2, just above Z1. My true anaerobic threshold is somewhere around 161-163. This is ridiculous! I was hiking up at easy effort for the first ten minutes. My muscles were fatigued after yesterday’s effort, but that isn’t the reason for it to be so wrong because aerobically I wasn’t stressed at all.
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@Brad_Olwin said in Subject: Feedback on Zone Sense accuracy: Short intervals and Zone 2 threshold shifts:
I do not know what HR belt you are using.
I use Suunto HR belt, and it is reasonably new, perhaps 4-5 months old, and I don’t use it that often. It was the same with Polar H10 before.
If I have a truly easy run. ZS remains green. But usually those are Z1 jogs with my dog where we do a lot of stops. But if I am trail running and putting some effort, my ZS graphs are always messed up like in the example above. I think it confuses the muscular stress with the aerobic stress. Aerobically I am well developed and my HR stays in Z1 and Z2 most of the time with occasional Z3 and Z4 and almost never Z5, but according to ZS it is red a large percentage of the time. I guess I am an outlier and ZS simply doesn’t work for me.
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Another strange ZS chart from my yesterday’s 30 min treadmill run. First a 10 min warmup on 8, then gradual increase to 13. Somehow ZS claims that running at 5:29 is more challenging for me that at 04:46. Also a 2% VO2max effort?
While the chart is not even touching that zone…
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@cheetah694 ZoneSense isn’t aware of your speed, effort you put in, not even your current heart rate. It applies statistical calculations on a series of your individual beat-to-beat intervals (time between subsequent beats of your heart). If the statistics show a certain pattern, ZS will show you the respective zone. So its accuracy depends on, in addition to the applied algorithm, the quality of the data received from the HR belt, and your individual physiology.
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@halajos Yeah, fine. I have a feeling I’ve read and heard enough of it. My next buy will be a lactate meter.
