I used wrist-based wearable tech from 2018, when I bought a Fitbit Alta HR, the first of a string of fitness bands and watches.
I liked the idea of them. I didn't need them to play stored music tracks, nor to pick up texts and emails, nor to pay for things. I wanted interesting, informative and inspiring fitness measurements. Plus a handful of useful features, like a watch dial so that I could tell the time, and vibrating alarms, and a countdown timer.
My Fitbits and my Garmin watch gave me those things. They were easy and comfortable to wear, looked good, and were mildly trendy. Fitness had taken off: you could be dedicated to it, or just a dabbler. Either way, wearing a fitness band or watch appeared to be a gateway to better physical fitness. It was also a desirable lifestyle accessory - one easily obtained - that boosted your personal image and therefore your self-esteem.
This was my lineup of fitness wearables:
Fitbit Alta HR (2018-2020)
Fitbit Inspire (2020-2021)
Fitbit Versa 3 (2021-2024)
Garmin Vivoactive 5 (2024-2026)
The first two Fitbits were bands with a small screen. The much more sophisticated Fitbit Versa 3 was almost a smartwatch. The Garmin could definitely be described as a smartwatch, although still very much biased functionally towards fitness. None of these bands and watches were of course fully-featured smartwatches in the Apple or Google sense.
All the devices in my list promised dependable and usefully accurate fitness monitoring by various clever methods. This produced continuous 24/7 measurements that when synchronised to the Fitbit or Garmin app gave a good picture of how I was doing. Meanwhile, while the band or watch was on my wrist it would be notifying me of goals met. I always had a moment of celebration when the display on the device burst into life - with a display of fireworks on my first Fitbit! - whenever I'd reached (say) my daily 10,000 steps target. Yes!
I was less happy with other analyses. I seemed to be a very poor sleeper, only rarely getting a 'good' - a real downer when you awoke in the morning. The Fitbits were however not overly critical, remaining upbeat and hopeful of gentle improvement, and I felt constantly encouraged by them rather than criticised. Which is what I needed: a carrot, not a stick.
The Garmin, however, took me to task much more. True, it was for people who might be gym-goers (definitely not me!) and offered advice, both on the watch and in the app. But it came across as the nagging remarks of a coach who felt I wasn't taking things seriously enough.
The Garmin also offered a wider range of metrics than the Fitbits had, and some (like its 'stress' assessment, or its 'body battery' feature) were worrying. I discovered that I could be badly 'stressed' simply by having a good time with my friends. I eventually decided that Garmin was measuring all kinds of excitement and stimulation, both good and bad. My 'body battery' could start off high, but often it didn't, so that according to the Garmin I was on my last legs by late afternoon. Concerning. And puzzling, when I didn't feel drained at all.
One metric - 'heart rate variation' - really got to me. Despite reading up about it, I wasn't quite sure what Garmin were really measuring here. Nor was my doctor, when I showed the alarming HRV record to her. I think it told me to what extent my heart could speed up and pump oxygenated blood around my body in any situation where sudden, rapid movement was required. Such as exploding into a sprint. Or running away from a mad axeman. Or from an enraged bull. My HRV measurements indicated that I'd be hewn or gored for sure. And yet I could, without question, react pretty fast in real life. Why the discrepancy?
As recent posts reveal, I grew tired of harvesting fitness data with a device that couldn't tell me the time at a glance, and bought a 'traditional' wristwatch instead, my Citizen Promaster Tough, which simply tells me the time. I had to abandon those celebratory moments whenever I achieved 10,000 steps. But to compensate, I walked away from those worrying metrics that couldn't possibly be good for my peace of mind. I'd grown sceptical of them, anyway, because some of them didn't make sense.
In the Garmin's final weeks on my wrist I was interested only in steps taken, and my heart rate. The heart rate was one of those puzzling measurements. The Fitbits had recorded 'normal' heart rates of 60+ beats per minute, depending of what I was doing. If I needed to climb a flight of stairs, or a long slope, my heart rate rapidly increased into what you might call the aerobic zone. But of course that too was entirely normal, and although possibly somewhat out of puff, I felt fine. And once I got my breath back, I felt excellent. Here are some app screen shots from a Saturday in 2020, when I was wearing the Fitbit Inspire.
The Garmin showed a different picture. It often recorded resting heart rates down into the upper 40s. And yet I still felt fine. It was abetted by my Omron blood-pressure monitor, which took a pulse reading as well. Here it is.
But how could such a disturbingly low resting heartrate be reconciled with normal blood pressure? Did I possess an overlarge heart that shifted so much blood with each beat that it could afford to pump slowly? Unlikely! I was no trained athlete, for instance.
So I asked AI about it. Specifically, Copilot. And Copilot informed me that while the Omron monitor was good for measuring blood pressure, it wasn't sensitive enough to record every beat of my heart. It might therefore miss the odd pulse. I should test this by taking my pulse the old-fashioned way - using a watch for thirty seconds, with a finger on a vein in my wrist, counting the beats, and doubling the result. Which I did. And repeated this watch-and-finger routine at intervals. And guess what? Each time I got a resting heart rate of around 60bpm, just as it should be.
Hah.
So I was wrong to trust both the Garmin watch and the Omron monitor when recording my pulse. The old way - with a watch, a steady finger, and an ability to count - is all that's needed for an accurate check.
It surely follows that every algorithm used by the Garmin watch to create a picture of my fitness from my heart rate must have been flawed, at least in my own case.
So I feel let down. These devices cannot be entirely relied upon.
I shall continue to use the Omron for blood pressure measurements. That's primarily what it's for. I'm sure it's quite good enough for that purpose. But I don't think I'll ever invest in another fitness watch. Or things like fitness rings.
Disappointing for the companies that market them, of course. But look, if their results are questionable, what is the point of spending any money on them?
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