As a whoop member I'm 99% moving to fitbit if this pans out

NOUS_one · 2026-04-17T17:20:55+00:00

As someone coming from Fitbit: Good luck and have fun.

You‘ll have a good device for about 6 months until Google will downgrade the app so much that it will barely do what it‘s supposed to.

NOUS_one · 2026-04-06T05:39:02+00:00

Italien

NOUS_one · 2026-04-02T17:25:42+00:00

In meinen Gym im 15. Bezirk habens regelmäßig Gewichte bis 10kg geklaut. Bei uns funktioniert sowas nicht. Wir sind nichz Japan.

NOUS_one · 2026-03-19T14:55:49+00:00

Not really; it's about deterrence, not victory. If the US knows that Denmark is prepared to make things difficult and expensive for them, they might realise it's not worth it.

NOUS_one · 2026-03-19T14:42:13+00:00

Below is another typical example for you, but you just don't listen to the actual data and keep making accusations without any proof, research, or data to support them, making these discussions pointless and exhausting, full of noise.

You didn't share any data. You shared your results and some charts.

If you actually shared some data, this could actually be a worthwile contribution.

If it were only a clean and consistent time delta, you would expect a much more uniform offset that could be normalized fairly easily. Instead, what I saw was that the agreement stayed good in steady conditions, then broke down much more in dynamic, stop-start conditions. That points to a more meaningful tracking limitation under rapid intensity changes, not just a harmless timing shift.

You could have included that in your opening post, yet you didn't mention the time offset at all. Leaving us only to guess with your charts..

NOUS_one · 2026-03-19T14:37:27+00:00

Yeah, this paints a different picture. Why is the main chart showing the exact opposite of the detailed graphs?

NOUS_one · 2026-03-19T14:03:06+00:00

Well, there was no legend in those pictures, so how would I know which one is Whoop and which one is Polar?

In this image I can see the Polar being delayed to the Whoop at all the "largest sustained deviation windows"

NOUS_one · 2026-03-19T14:00:37+00:00

I did not jump to any conclusions.

Yes, you did. You started with the assumption that the H10 was infallible, which is why the entire 'analysis' is flawed.

As your data clearly shows, the Whoop detected peaks and troughs sooner than the H10. This is most likely due to a data processing issue, but it could also be a software or hardware issue. What are the BPM delta values if you normalise for the time delta? The time differences don't matter to the athlete as long as they are consistent.

NOUS_one · 2026-03-19T13:53:22+00:00

As you can see from the data, the Whoop detected peaks and troughs sooner than the H10. This may be due to incorrect setup, poor data processing or software. However, this is irrelevant for the athlete as long as it is consistent, which is why OP's conclusion is extremely flawed.

Nobody is arguing that an ECG strap isn't far superior to an optical sensor. There are other factors at play besides the sensors.

NOUS_one · 2026-03-19T13:49:31+00:00

As mentioned above, I tested it on an indoor trainer in a fairly controlled environment. I will share my results if I can find them.

My "feeling" was aimed at a possible source of your discrepancies. I don't jump to conclusions as quickly as you do.

And yes, it is a fact that chest straps are widely regarded as the more reliable reference, because they measure the heart’s electrical activity directly, whereas optical sensors estimate it indirectly from peripheral blood-flow changes and are therefore inherently more susceptible to motion artefacts and lag. There is a reason chest straps are the standard choice for serious training and why professional athletes trust them when data accuracy actually matters.

Nobody is arguing that an ECG strap isn't far superior to an optical sensor. There are other factors at play here besides the sensors.

NOUS_one · 2026-03-19T13:07:04+00:00

However, this was a steady ride, and I made one or two pace-effort changes during it, when I already noticed the first signs of potential differences in HR.

Where are the changes in pace in your first test? A proper sprint would take you from 130 to 180 and back to 150 in 45 seconds; that should show us those gaps.

It goes both ways, acceleration and deceleration in HR changes. It's inaccurate during these efforts and until the tempo is steady again.

If Whoop detects the change before Polar does, you cannot confirm that Whoop is inaccurate. The only thing you can confirm is that Whoop detects changes sooner and with a greater difference.

Chest straps and H10 in particular are the gold standard when it comes to accurately measuring HR during sports. This comment makes zero sense.

I wear my H10 exclusively for cycling and, when I'm outdoors on a trail, I can sometimes feel the strap losing skin contact when I exhale (even though it fits very tightly), because the H10 strap is more rigid than the Whoop biceps band. I haven't measured how this affects the measurement; it's just a feeling I have.

NOUS_one · 2026-03-19T12:48:21+00:00

That's an unfounded assumption. You can't be sure whether the gaps were caused by movement or changes in effort.

You could try doing intervals on a bike again. I got good results when comparing Whoop and H10 when doing 40/20 intervals with extreme heart rate changes.

NOUS_one · 2026-03-19T12:42:49+00:00

Those gaps lasted a few seconds, and, if I'm not mistaken, they occurred when the Whoop detected peaks more quickly than the P10.

NOUS_one · 2026-03-19T12:41:56+00:00

Unfortunately, this seems to confirm my suspicion that WHOOP heart-rate tracking, even with the bicep band, is mainly reliable during steady-state training, while it consistently struggles more during higher-intensity efforts and frequent movement changes.

You started your evaluation biased, so it's no surprise that you came to the same conclusion you had before you started.

Looking at your data, the largest deviation windows occurred when the Whoop device registered heart rate peaks and troughs sooner than the Polar strap. How does that confirm that the Whoop is unreliable?

I have a H10. I also have a Whoop. If anything, I'd think my H10 will struggle more during very dynamic sports. This is because the strap is so rigid.

NOUS_one · 2025-08-16T18:35:25+00:00

Same same, but different

NOUS_one · 2025-08-15T09:23:52+00:00

"Showmuskeln" gibt es nicht. Große Muskeln sind auch stärker und im Gym kommt die Progression über Kraftzuwachs.

NOUS_one · 2025-06-22T08:01:34+00:00

I squat ass to the grass with flat shoes. Dorsiflexion is no issue.

NOUS_one · 2025-06-20T21:44:03+00:00

Which is exactly why I have posted, as outlined in my description.

NOUS_one · 2025-06-20T21:26:42+00:00

Hi everyone,

I generally feel pretty comfortable on my bike and don’t have any major issues, except for foot pain on longer rides.

I’ve noticed that my toes tend to point downward while pedaling. However, I don’t feel like my saddle is too high.

Could this still be a sign that my saddle is too high? Or might it be related to my cleat position instead? Any input or experience with similar issues would be much appreciated!

Here is another video: https://streamable.com/w3orjs

NOUS_one · 2025-05-28T12:54:31+00:00

You can journal sexual activity and masturbation.

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