🔴 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
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* 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.
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👇 $30 off any new WHOOP membership, affiliate* (paid) link, supports the channel!👇
https://join.whoop.com/QuantifiedScie... ($30 off any new WHOOP membership)
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👇Amazon Affiliate* (paid) links. Supports the channel, doesn't cost you any more!👇
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🔴 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

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📸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
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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.