Huawei Band 9: Full SCIENTIFIC Review (I Was WRONG! & Right…)

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▬▬▬▬▬▬▬▬▬▬👇DISCOUNTS/AFFILIATES!👇▬▬▬▬▬▬▬▬▬▬ 🔴 Best place to get a Huawei* ;-) : https://geni.us/HuaweiBand9 🔴 Whoop Strap 4.0: https://join.whoop.com/QuantifiedScientist ($30 off any new WHOOP membership) 🔴 Eight sleep 350$/200$ (€) discount*: https://eight-sleep.ioym.net/TheQuantifiedScientist + add code “UNBOXTHERAPY” or “TQS” for full discount 🔴 Oura Ring Link: I recommend you search for a discount on reddit with the "Refer-A-Friend" program! If you can’t find one: https://ouraring.sjv.io/rQ4L33 (affiliate link that supports the channel, but doesn't have a discount) 🔴 General Amazon link*: https://geni.us/thequantifiedscientist ☝️Amazon Affiliate* (paid) links. Supports the channel, doesn't cost you any more!☝️ 🟢 Instagram: https://www.instagram.com/quantified_scientist/ 🟠 Shorts: https://www.youtube.com/@smartwatchshorts 🔵 Newsletter: www.robterhorst.com 🟡 Twitter: @QuantifiedRob * Affiliate (paid) links support the channel by earning me a commission on any sale, and it doesn't cost you any more! My opinions are completely my own, and this content is not sponsored. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 📸My Gear* (paid links, supports the channel and doesn’t cost you any more)📸 Camera body (main): https://geni.us/SonyA6600_body Camera lens (main): https://geni.us/SigmaContemporary Camera (B-roll 1): https://geni.us/Sony_ZVE1 Camera (B-roll 2): https://geni.us/CanonEosM50MarkII and https://geni.us/Sony_ZVE10 Light: https://geni.us/Godox_VL150 Softbox: https://geni.us/NiceFotoSoftbox Light stand: https://geni.us/WalimexLightstand ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ Reference devices: ZMax + Dreamento: https://www.biorxiv.org/content/10.1101/2023.08.18.553744v1 & https://github.com/dreamento/dreamento Polar H10: https://pubmed.ncbi.nlm.nih.gov/31004219/ 🔴 Polar H10: https://geni.us/hnXc Intro Music from #Uppbeat (free for Creators!): https://uppbeat.io/t/moire/new-life License code: OBLD6VBBCTRDFZQP Timestamps: 00:00 Intro and Background 01:00 Heart Rate Test 1 : Indoor Cycling 05:30 Heart Rate Test 2 : Running 07:16 Heart Rate Test 3 : Outdoor Cycling 09:59 Heart Rate Test 4 : Weight Lifting 12:31 Sleep Test Part 1 16:55 Sleep Test Part 2 : Overview 19:06 Limitations, Recommendations & Conclusions I was wrong about the Huawei Band 9, but I was also right. And that’s why today’s video is a very important one to watch, even if you are not interested in the Huawei Band 9 specifically. Let me explain. A few weeks ago I made a first video on the Huawei Band 9, in which I showed that the Band 9 appeared to perform less good than the older Band 8, at least based on the initial data. Because of technical reasons I could only access a limited amount of data, but I thought it was important to show you what I had already. I now have access to the full set of data I had at the time, and this tells a different, and potentially even more interesting story; and not just about the Huawei Band 9, though of course we’ll be doing a full health tracking review in this video. It also tells you something about the testing of smartwatches, and the potential reasons why I might get different results from for instance DC Rainmaker or Matt LeGrand, but more on that later. In this video we will focus on two aspects of the Huawei Band 9: the sleep stage tracking performance and the heart rate tracking accuracy Still, overall I think my testing results are good news for Huawei and their new Band 9. The results seem to indicate the Band 9 is better than my initial results indicated. Their new sensor layout might not be as bad as I initially thought, and my new testing seems to indicate it is roughly on-par with the older Huawei Band 8, though we do see some slight differences, some in favor of the Band 9 and some in favor of the Band 8. At least that is, if we consider the better of the two Band 9’s I tested. So, why would these give different results, and why were my initial results even worse? Well I have several theories. The first thing that likely played a role is that random variation in performance meant that the limited amount of data I had initially was unfortunately not representative of the actual performance. You can imagine that each time I do the same heart rate test, there is a chance it will be better or worse than average. This is usually represented by this type of bell-curve, where the height in the curve indicates the chance of getting a better or worse result for a single test. The first is that the way my bones and blood flow are formed on both wrists might make them easier to measure on the left side versus the right side. Or, it could be that the production quality of one watch was better than the other. I can’t say which of these is true, unless I collect a lot more data. Still the Huawei Band 9 appears to be quite decent overall, which means I can now recommend it if you want a cheap heart rate tracker that is pretty good. Also check out the results of some other reviewers!