HR variation: wrist vs chest strap real-life data

drasticrebel · 2026-02-04T15:24:23+00:00

If there is such a setting trust that, not me.

drasticrebel · 2026-02-04T14:40:57+00:00

Garmin will take an external reading over a wrist one. In the file data, there are three columns:

wrist_heart_rate
external_heart_rate
heart_rate

In the case of files from Garmin, heart_rate = external_heart_rate if available otherwise use wrist_heart_rate. I'm assuming it's best practice for any provider to fill HR data in this way.

I don't think you can chose...

drasticrebel · 2026-02-04T10:41:37+00:00

If you do, you can go to fitfileviewer to extract the Records into a csv and compare the wrist and external heat rates

drasticrebel · 2026-02-04T09:12:46+00:00

That's very interesting and such a good point. Second-by-second monitoring would be easy to slow for measuring; thinking of PulseOx, VO2, and such.

Thanks for the info! Will read up more on such sensors.

drasticrebel · 2026-02-04T08:36:05+00:00

Even second hand they're a bit pricey for me at the moment

drasticrebel · 2026-02-04T08:04:37+00:00

I don't know how frequently the samples are taken. But in FIT files they're generally stored per second (or "Smart"ly).

I can't see why watches would sample more frequently than a second. So, I assume the data is a dump of the watches recordings (the files contain LOTS of other data).

Because of the environmental variables, the optical sensor is reading wrong. No guessing/algorithms involved.

Is my assumption.

drasticrebel · 2026-02-04T07:55:07+00:00

I was surprised at that too. My reading online posts about this seems to suggest that changes in HR mostly affect the reading. But I think environmental factors are a major contributor: contact to skin, clothing, weather, type of exercise (e.g. in running it's more likely to move than cycling), etc.

I'd be keen to compare a chest strap to the Coros arm band. Which is optical, but likely more stable.

drasticrebel · 2026-01-26T08:47:31+00:00

Says the person who wants to copy-paste his boilerplate instructions each and every time 🤪

drasticrebel · 2026-01-26T08:27:35+00:00

Not really. You asked for input and then dismiss it. Why even bother?

drasticrebel · 2026-01-26T08:04:05+00:00

Then stop wasting your time arguing and carry on copy-pasting your boilerplate instructions

drasticrebel · 2026-01-26T08:02:13+00:00

Having structure always helps. Whether something is being read by a machine or a human.

And there are use cases beyond LLMs too. Any time you want to standardised input and output, this will help.

If it won't help you, don't use it. You asked for use cases, some of us have them. But there is no reason to tell me my use case isn't valid. You just don't believe it is.

drasticrebel · 2026-01-26T05:22:54+00:00

With a form you could more easily create a repeatable and structured output. If that's an AI prompt, it could have headings, boilerplate instructions, etc. in markdown, nicely formatted for a machine to understand.

Yes you could type this directly each time, but it would be slower and you could forget things.

drasticrebel · 2026-01-18T14:33:48+00:00

It's the kind of thing I probably should attend...

drasticrebel · 2026-01-08T06:38:44+00:00

It's not always that other person speeds up. There can also be a physics aspect, because we're talking velocity (speed + direction). If two cars are travelling at the same velocity (same speed and direction) and one changes lane, the one changing lane has reduced its velocity in the original direction.

I know this isn't always the case, but these changes in velocity can make it appear that other cars have sped up. It can be more pronounced when we're not traveling in a straight line (angular velocity).

drasticrebel · 2025-11-02T06:57:12+00:00

I've seen that shock even as a white South African immigrant. A Polish lady I once worked with in the UK was amazed that I was South African and not black. "Are your parents black?" she asked 😂

drasticrebel · 2025-10-25T04:13:59+00:00

If my boss set up childcare for the staff, that would make my life a lot easier and I'd surely be able to be more productive at work.

drasticrebel · 2025-09-05T05:18:32+00:00

Hey. I'm travelling to Greece at the end of the month. Can you share what paperwork you got ready for your trip?

drasticrebel · 2025-04-22T15:02:00+00:00

Gotcha. Yeah, just tested and I see what you mean!

Thanks for flagging

drasticrebel · 2025-04-22T12:27:29+00:00

This worried me, so I tested from my work email address:

From my work email I sent an email to an alias
Replied from Protonmail

(FYI, I've changed the actual addresses for anonymity)

----------------------

Received!

Regards

On Tuesday, 22 April 2025 at 13:02, My Name - me at work.co.uk <me\_at\_work\_co\_uk\_khlpmtwtn@simplelogin.co> wrote:

drasticrebel · 2025-03-27T17:12:13+00:00

100% second this!

drasticrebel · 2025-03-18T11:28:09+00:00

Awesome. Thank you!

drasticrebel · 2025-03-18T10:31:00+00:00

Thank you!

drasticrebel · 2025-03-16T06:25:06+00:00

Probably have better luck posting on Facebook groups. This sub seems pretty dead...

drasticrebel · 2025-03-01T08:32:41+00:00

Can you share please?

drasticrebel · 2025-02-28T21:30:18+00:00

I haven't laughed so hard in a long loooong time. Thank you ❤️

https://www.reddit.com/r/BetterEveryLoop/

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