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Apple Watch Ultra 2 (vs Series 9) : Scientific Review

🔴 Get an Apple Watch Ultra2*: https://geni.us/AppleWatch_Ultra2 🔴 Get a Series 9!*: https://geni.us/AppleWatch_Series9 🔴 General Amazon link*: https://geni.us/thequantifiedscientist 🟢 Instagram:   / quantified_scientist   🟠 Shorts:    / @smartwatchshorts   🔵 Newsletter: www.robterhorst.com 🔵 Blog: https://www.robterhorst.com/post/appl... 🟡 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. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 👇 $30 off any new WHOOP membership, affiliate* (paid) link, supports the channel!👇 https://join.whoop.com/QuantifiedScie... ($30 off any new WHOOP membership) ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 👇Amazon Affiliate* (paid) links. Supports the channel, doesn't cost you any more!👇 ▬▬▬▬▬▬▬▬▬▬BEST WATCHES▬▬▬▬▬▬▬▬▬▬ 🔴 Whoop Strap 4.0: https://join.whoop.com/QuantifiedScie... ($30 off any new WHOOP membership) 🔴 Oura Link: I recommend you search for a discount on reddit with the "Refer-A-Friend" program! If you can’t find one: https://ouraring.sjv.io/rQ4L33 (affiliate link that supports the channel, but doesn't have a discount) 🔴 Eight sleep 200$/150$ discount*: https://eight-sleep.ioym.net/TheQuant... + add code “TQS” for 200$/150$ total discount 🔴 General Amazon link*: https://geni.us/thequantifiedscientist 🔴 Polar H10: https://geni.us/hnXc ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 📸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 ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ All results: https://www.robterhorst.com/post/appl... Reference devices: ZMax + Dreamento: https://www.biorxiv.org/content/10.11... & https://github.com/dreamento/dreamento Polar H10: https://pubmed.ncbi.nlm.nih.gov/31004... Intro Music from #Uppbeat (free for Creators!): https://uppbeat.io/t/moire/new-life License code: OBLD6VBBCTRDFZQP Timestamps: 00:00 Quick Intro 01:00 Testing setup 01:22 Apple Watch Ultra 2 Improvements 04:24 Indoor Cycling Test 1 : Male 06:44 Indoor Cycling Test 2 : Female 07:53 Indoor Cycling Test : Comparison w/ Other Watches 09:33 Outdoor Cycling Test 1 : Male 12:10 Outdoor Cycling Test 2 : Female 12:49 Outdoor Cycling Test : Comparison w/ Other Watches 14:55 Running Test 1 : Male 15:57 Running Test 2 : Female 17:07 Weight Lifting Test 1 : Male 18:32 Weight Lifting Test 2 : Female 19:10 Weight Lifting Test : Comparison w/ Other Watches 21:06 Sleep Test : Ultra 2 27:15 Sleep Test : Ultra 2 vs Series 9 27:40 Sleep Test : Comparison w/ Other Watches 30:06 GPS Test 36:28 Oxygen Saturation Test 38:25 Limitations 38:53 Recommendations, Wish List & Conclusions I didn’t think I would say this, but you might want to think twice about getting the Apple Watch Ultra 2. Or maybe a better wording is that I am personally conflicted about this watch. I have collected a lot of data with the Apple Watch Ultra 2 over the last 10 days, and what bothers me is that it doesn’t seem to be any better, and might even be worse in some cases, than the Series 9, even at things that the Ultra 2 should theoretically be better at. But you can judge yourself based on the data I will show you in this video, and there is plenty of data to share. Specifically, we will be testing the heart rate tracking accuracy of the Ultra 2 on myself and Theresa for a total of 42 workouts, and I’ll test the sleep stage tracking performance with 5 nights of data, we'll be looking at the GPS tracking consistency using 18 bike-rides and we’ll check the oxygen saturation measurements using 100+ datapoints. Let’s get to it! Hello everyone! For those of you that are new to the channel, my name is Rob, and I am a postdoctoral scientist specializing in biological data analysis. I’ve put the Ultra 2 through some rigorous testing, and the results are super interesting. And to see if a big watch like the Ultra 2 also works on smaller wrists, I tested it on Theresa as well. As you might have noticed, my reviews have gotten quite long recently, so I’ll try to be a bit more concise, but I’ll upload the full results to my website. But, no promises, since I might get carried away and make this a long review anyway. However, first some quick basics about the Ultra 2. How is the Ultra 2 different from the Ultra 1? The screen is significantly brighter, now putting out a max brightness of 3,000 nits compared to the 2000 nits of the Ultra Generation 1.