Also, make sure to use a different CSPRNG for your gait randomizer, to avoid entropy starvation.

The correctly identified .968x42=40.696 of the participants.

Also any standard-ish physical activity that comes with instructions usually includes breathing in those instructions. So I would expect results to vary substantially depending on where they found the study participants.

I rarely get to confirm whether I'm right or wrong, but everyone sounds slightly different.

Looking at the real-time stream the breathing was noticeable, at 2Hz it would probably be very useful, if you have the dedication to write the tools to analyze the data.

I was thinking about doing this with a fanny pack where I put the sensor and battery pack in the fanny pack and a strong magnet at the opposite side of the strip in order to measure my breathing frequency during excercising.

Driving home from work, I get at least 2-3 "shocks" when other drivers cause close calls. I flinch, get a surge of adrenaline, and have to breathe to calm down. My sine wave is disturbed. Let's say a driver swerved close to my vehicle and I flinch and swerve away.

The next day, a driver drifts close and I instinctively get a shock, flinch, and swerve away. I didn't intend to be jumpy and nervous, but apparently my electrical system is still "echoing" from the day before.

At work, I experience anxiety, and it's a "softer" shock, but the long term result is nervousness, twitching, holding my breath in anticipation (of an attack that never comes), feelings of dread.

People talk about fixing upset emotional states and psychology, but in thinking about this, I characterize my own problems as needing my electrical system tuned-up.

How often did a farmer 1000 years ago get adrenaline dumps from fast-twitch motor neurons as he zoomed 80mph down the highway? And yet now it's literally all day. Vehicle noise at 4am, jump awake. Phone rings, jump and flinch. Driving, etc.

I don't think we look often enough at the physiology of stress from the perspective of the electrical signals generated by the nervous system. It seems like all kinds of problems come from it. To the article's point, I know my breathing has been affected from stress and tensions. I don't think i'm particularly unhealthy, so I think a lot of people could relate to feeling "not-unhealthy" but also really twitchy and disturbed from stress and tension.

In my thinking about this, fitness and health come from creating the electrical impulses in a steady, predictable way (i.e. walking, lifting) such that the electrical pathway can remember it's baseline frequency and "strengthen" the good frequency. And hopefully smooth-out the peaks and valleys of the signal interruptions caused by stresses.

Still, I can see it. My wife and I are probably equally fit, but she breathes much faster than I do. I also notice that I sometimes don't take a breath (or feel any need to) for several seconds, if I'm being sedentary.

Yeah, it turns out if you can strap a device to somebody then wow you can identify them.

This is interesting, but not a big surprise!

Now if they can do this from an external passive sensor like a camera or microphone, then yeah that would be a neat result.

Here's a fun fact, the CPAP machine lowers my Heart Rate Variability. HRV spikes when I sleep part of the night without it.