Nothing in this post is medical advice. I am not a doctor. Talk to your GP about anything health-related, especially blood pressure and medications.
I was awake at 3am again. Nothing unusual about that. But this particular session had a specific edge to it, the kind that comes when a question has been sitting unanswered for long enough that it starts to feel personal. My blood pressure was still elevated. I am on medication. I have been since 2005. And yet there it was, sitting stubbornly at 133/85, refusing to behave, and I was lying in the dark wondering the same thing I have wondered a hundred times: is this just what my fifties are?
The answer turned out to be no. It is not my age. It is my knee. And I only found that out because I stopped looking at my health gadgets one at a time and let an AI read them all at once.
The gadget problem
I have more health data than most GPs see in a year. A Garmin Fenix 8 on my wrist tracking heart rate, sleep, VO2 max, Body Battery and HRV around the clock. A Hilo blood pressure monitor on my other wrist giving me continuous BP readings, day and night. A Hume Health Pod on the bathroom floor measuring body composition, lean mass, body fat and metabolic age every morning. A Bluecrest medical screening with a 6-lead ECG, blood panel, the lot.
Four devices. Each brilliant at what it does. None of them talking to each other. Each one a different sense, with no brain joining them up into a single coherent picture.
For a while I handled this the old way. I used to export everything once a month and hand it to Gemini as a sort of personal health assistant, upload the files, ask it to spot trends, read the output. Useful. But it was a snapshot of a moving thing. A monthly photograph when what I needed was a film.
Wiring it in properly
This time I did it differently. I set up a folder in Google Drive and connected Claude to it directly. The rule is simple: anything I drop in the folder, Claude reads live at the start of each session, no uploading, no monthly ritual. The Hume weekly report goes in as a screenshot and Google’s OCR picks up the numbers automatically. The Garmin data flows in too. For the first time, the whole picture sits in one place and updates itself.
Claude suited this better than Gemini for one specific reason: it integrates cleanly into the same ecosystem as my Garmin data through Google Drive, and I wanted something that could read across all the sources in a single session rather than requiring separate uploads to different tools. The result is less a monthly snapshot and more a living dashboard that I can interrogate in real time.
And the first thing it did was find two things that no single gadget on its own could have seen.
The blood pressure detective story
I gave Claude 13 months of data. Blood pressure from the Hilo, steps and fitness from the Garmin, body composition from the Hume, and the Bluecrest clinical numbers as a baseline. I asked it to look for patterns I had missed.
It found one immediately. My blood pressure did not drift upward gradually, the way you might expect from age or stress or the general accumulation of life. It moved on a date. And when Claude lined up the BP trend against everything else, the picture was almost uncomfortably clear.
August 2025 was my best month. Daytime blood pressure averaging 121/77. I was doing around 13,700 steps a day. Nearly 1,000 minutes of hard effort exercise a week. VO2 max at 44. Weight around 87kg. Everything pointing in the right direction.
Then in October and November I did my knee.
Steps roughly halved. Hard effort minutes roughly halved. Weight climbed about 10kg over the following months. VO2 max fell five points. And blood pressure marched up to 137/87 by December and parked there.
The correlations Claude pulled were almost comically tidy. Weight against BP: 0.84. Steps against BP: minus 0.85. Hard effort minutes against BP: minus 0.83. VO2 max against BP: minus 0.79. Every metric pulling in lockstep, all of it pointing back to a single event. It was not five problems. It was one event with five shadows.
Twenty years of wondering whether it was salt or stress or just bad luck. And the answer was sitting in the data the whole time, waiting for something to read the whole book at once.
The scale that was lying by omission
The second finding was quieter but stopped me just as sharply.
Between January and June 2026 my weight on the Hume scales went from 96.2kg to 97.3kg. Barely a kilo. If I had been using a bathroom scale, I would have shrugged and moved on. Not much happening, you would think.
But underneath that flat number, my body had been quietly recomposing in the wrong direction. Body fat up 3.3kg, from 18.3 to 21.6kg. Body fat percentage from 19 to 22.2. Lean mass down 0.9kg. Metabolic age drifting from 41 to 44. Health score from 697 to 662.
The scale weight was almost completely flat while the makeup of me was getting measurably worse. A standard bathroom scale would have told me nothing was happening. The Hume Pod already hinted at this in the review I wrote about it, the lean slightly low, the fat slightly above expected for my frame. But this was the moving picture version. Five months of quiet drift, invisible to a single number.
This is exactly why I wrote what I did in the Hume Health Pod review about ditching the Renpho. The cheap scale was not just inaccurate. It was lying by omission, because it only had one thing to tell me.
The reassuring part
I want to be honest about both sides of this, because the picture is not all bad and I do not want to write something that just sounds like doom.
The dangerous fat, the visceral kind that sits around your organs and drives cardiovascular risk, stayed low throughout. Index 8 to 9 the whole time. The gain was subcutaneous, the kind you can see, not the kind that quietly kills you. The Bluecrest ECG was clean. Sinus rhythm, 66 bpm, no ectopics. Blood sugar normal. HDL cholesterol at 1.8, which is elite. 59 green flags on the screening.
And the engine responds. Between 2017 and 2025 my resting heart rate fell from 71 bpm to 53 bpm as my training roughly tripled. The body knows what to do when you push it. What is happening in 2026 is that process running in reverse because I stopped pushing.
The plan, and why it is simpler than I expected
The good news about having one cause is that it points to one fix. Rebuild the aerobic base using what the knee will allow: the bike, incline walks, the rebounder, climbing. Get back toward summer 2025 activity levels. Push sleep from around six hours toward seven or more, because the Fenix data has repeatedly shown me what the Garmin Fenix 8 review touched on, that low HRV and poor sleep are the first signs of a system under stress, and the last things to recover.
Everything else, the blood pressure, the fitness, the body composition, is downstream of those two things. That is what the data says. That is what I am doing about it.
The green shoot
The morning I finished pulling this together, my VO2 max ticked from 39 to 40 for the first time in months. One point. It means nothing on its own. It means everything as a direction.
Update, July 2026: that green shoot turned into something. I have written up the first real evidence the recovery is actually underway, a fortnight of heat acclimation running that reclaimed ninety seconds a kilometre and a resting blood pressure finally easing off its six-month plateau, in my July interim report.
What I actually learnt at 3am
Your body keeps an honest ledger. The gadgets are not the point. They are pages. What changed is that something finally read the whole book at once, and the story it told was not that I am getting old. It was that I stopped moving, and here is exactly what it cost, now go and get it back.
The next post covers the practical side: how I set this up, how you can do the same thing with whatever devices you already have, and what to tell the AI so it actually gives you useful output rather than just repeating your numbers back at you.
About the author: I’m Pete Harrison. I’m 55, I run a business, and I have a mild case of insomnia that means I spend a lot of time at 3am reading about gadgets, gear and ways to make life work better. Things I Learnt at 3am is where I write honestly about the things I’ve actually bought, tested and lived with. No fluff, no rehashing the spec sheet. Just the real verdict from someone who uses this stuff every day.
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