Apple Watch Series 8 : Scientific Long-term Review

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Timestamps:
00:00 Intro
02:07 Ultra Updates
02:47 Heart Rate Test 1: Spinning
06:52 Heart Rate Test 2: Cycling
10:13 Heart Rate Test 3: Running
13:11 Heart Rate Test 4: Weight Lifting
15:30 Heart Rate Test 5: Yoga
16:13 Heart Rate Test Conclusions
16:54 Sleep Stage Test 1: Sleep Stages
22:36 Sleep Stage Test 2: Overview
24:08 GPS Tracking Test
27:12 SpO2 Test 1: High Oxygen Detection
29:20 SpO2 Test 2: Low Oxygen Detection
31:19 Health Tracking Test
33:19 Conclusions
33:50 Apple Watch Ultra Problems
34:51 Recommendations
Apple Watches have consistently been amongst the best watches when it comes to accurately tracking your health and sports. But, how does the Apple Watch Series 8 stack up against the competition after 5 months of testing? In this video I’ll be sharing a scientific review of the Apple Watch 8 based on a lot of data. Over these past few months, I’ve thoroughly tested the Apple Watch Series 8, collecting data from 139 workouts, 60 nights of sleep, 84 GPS tests, and 2 tests of low oxygen saturation, to give you a comprehensive look at the sports and health tracking capabilities of the Apple Watch Series 8. On this channel I do not focus on features and looks, instead, we'll be focusing on what really matters to many of you - the accuracy and reliability of the measurements that the Apple Watch 8 takes. I’ll systematically analyze all the data I collected. We will compare 60 nights of sleep data from the Apple Watch 8 to that of an EEG device which can actually measure brainwaves, and we’ll compare the heart rate measurements of the Apple Watch to an ECG device. Next, we will be checking if the GPS signals are consistent and we will also test the Apple Watch in a low oxygen environment. This information should help you determine whether the health tracking features of the Apple Watch Series 8 are suitable for your personal needs. It is worth mentioning that while the Apple Watch 8 lived up to my expectations in many ways, there are a few crucial aspects where it actually showed some problems that I have not covered in my earlier videos. I was able to unravel these issues because I updated the computer code I use in my analysis, allowing me to better judge the performance of the Apple Watch Series 8. So sit back, relax, and let's dive into this scientific review of the Apple Watch.

[@TheQuantifiedScientist]

🔴 General Amazon link*: geni.us/thequantifiedscientist 🔴 Apple Watch 8 link*: geni.us/AppleWatchSeries8 🟢 Instagram: instagram.com/quantified_scientist/ 🟠 Shorts: studio.kzbin.info/door/cpARGzXNaC62UQWns2dh2Q 🔵 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. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 👇 $30 off any new WHOOP membership, affiliate* (paid) link, supports the channel!👇 join.whoop.com/QuantifiedScientist ($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: join.whoop.com/QuantifiedScientist ($30 off any new WHOOP membership)

[@goggog7581]

Can you please check out the Go2sleep sleep tracker?

[@romank3712]

Hello. There will be a review on Amazfit GTR 4?

[@thereisaplace]

FYI, your Chapter 2 title “Ultra Updates” should be labeled “Series 8 Updates” 😊 Fantastic channel and thank you! You’ve made my decision to pickup a Series 8 much easier.

[@ZUTF1025]

Series 8 also has the problem of delayed heart rate shown on the screen. I’ve compared it with my chest strap during cycling, but it is still extremely accurate! Though having “short” battery life, but it only takes about 20min to charge from 20% to 80%🎉 Worth the price.

[@deiu9999]

Man, your attention to details.. not only in testing to such details the accuracy of the watches but also in the way you make and edit your videos.. seems like you are a very organized, calculated and orderly person in general. 😁 Good for you!

[@Bettertodaybettertomorrow]

Just ordered an apple watch yesterday thanks to your videos, you made it very clear to me what would be ideal for my personal desired tracking which is that of health/fitness, aka sleep and weight lifting as well as calorie tracking. Thank you, have a good day!

[@Harishkumar-sn2bk]

I just love your approach towards testing

[@farkas266]

Awesome job Rob!

[@Chris_Wald]

Hi Rob, Thank you for posting all these video’s about fitness trackers, very useful info! However I have a bit of a strange use-case. See I’m a pilot currently flying unpressurized aircraft sometimes with supplemental oxygen. I currently use a finger-type-pulseoxi-metre. However I find this quite cumbersome, sometimes annoying and unreliable. Hence I’ve been looking at smarts-bands (because I already wear a mechanical watch that because of sentimental reasons is quite near and dear to me) as convenient alternatives to work at a glance. I’d love continuous monitoring and an alert if levels reach dangerously low levels. However I have trouble finding such a product. They all seem to monitor at intervals or during sleep. Do you have any recommendations? Thanks in advance and please keep up the great work! -Chris

[@lucamarcio4110]

Hi Rob, thanks for this impressive review! As an iPhone user I would like to by an Apple Watch: which is better between the SE and the SE2022, please? Thanks again!

[@rawrss]

@The Quantified Scientist love your quantitative approach to these videos! What would you recommend for those on Android ecosystem? Thx so much!

[@cormike]

This channel is amazing for benchmarking and I fully intend to buy the top performing tracker based on your independent benchmarking: on gps tracking I'm interested if you've considered comparing pace shown on a watch v true pace? It would make your gps tracking section more applicable as it is a key performance metric for runners/cyclists who may not be only interested in the primary gps accuracy. Just a thought! Love the channel

[@danielmgalli]

It´s strange that i´ve been looking for a channel like this for a while, and YT never recommended it to me... Anyway, you did an excellent job on this reviews! Thanks for the infos

[@tankokmeng]

This video single handedly convinced me to get an Apple Watch. Thank you, sir. Keep up the good work!

[@isletsweb]

Thanks again for the new review Rob. Very nice. It seems that the occasional overestimation of HR by the Apple Watch relative to the chest strap are errors biased toward consistency in patterns of variation. Maybe inaccuracy in general is nonrandom to the extent that it is biased toward consistency of such patterns. I suppose that could be due to Apple's algorithms that seem to aggregate data over many data points to get more accurate estimates. What do you think? That would be important to know if one is interested in variation itself in the underlying physiological/behavioral phenomena.

[@MrMorton]

This is great testing Rob. I've been an Android user since they came out but I admit I am jealous of the health features and accuracy of the Apple Watch. Tempting to flip 😭

[@TheQuantifiedScientist]

I know, tough choice!

[@96AyyZee96]

Same, the problem is that Samsung only has one heart sensor and 1 mini heat sensor compared to apple's 4 heart sensors alongside with 4 heat

[@georgemilev3244]

I am in the same boat, mate. Really considering to switch to Apple watch since i am really interested in the accuracy of steps, sleep and heart rate, and from what i see tested here on the channel Apple is on top of all parameters... i am also an Android user since i remember myself... really, really tough choice. I am glad that i found it this channel from this pint of veiw, but i am a bit sad Rob has killed my dreams of buying a Garmin for now lol

[@darrenjames218]

Exactly my position as well, especially tough since the release of the Galaxy S23 phones. Prior to that, I was fairly convinced that I would change to Apple.

[@LVIXII]

Same. But the battery life is still holding me back.. thinking of getting a GT3 Pro

[@dannyfrommiami]

This video is amazing. Great work!

[@ganixledezma9379]

Hello Rob! Thanks for all your videos they are super insightful. I have been thinking about getting a smart watch or the ring. If I get an Apple Watch, is there another app other than Apple’s that allows better data visibility and analysis? Thanks again for everything you do!

[@victor_rivas]

Excelente video, podrías hacer una comparación en la medición del VO2 max con equipos profesionales?

[@thisispw]

Great work Rob, thank you.

[@ceanngra290]

Hey! love your channel, really great content! Just a suggestion, how about a review of the apple watch series comparing use on the lower arm with the twelve south action sleeve upper arm band. I would be interested to see if there is much difference with how the sensors operate with the upper arm band when compared to the wrist. Keep up the great content! thanks!

[@ivanrododendro]

Amazing work man !

[@nKrandom]

Best in depth comparisons of health trackers!

[@TheQuantifiedScientist]

Happy to hear you enjoy my videos!

[@KarolManiata]

Hi, super Video! Kommt in Zukunft auch wieder ein Video über anderer Tracker? Mich persönlich würde die Amazfit 4 (auch die Mini Version) Serie interessieren. LG

[@alpine9214]

Wow! I love numbers and putting them in such a nice experimental setup is a treat to my brain and eyes!!! Thank you!!!! :D I love your channel name!

[@ranyhaj]

Thanks Rob, any thoughts on the Apple Watch accuracy for VO2 max? It seems to underestimate it after an update in spring of 2021

[@selimcanpolat8664]

great review as always! regarding 08:31, my theory is that the apple watch can't read the heart rate when performing internal processing tasks, like updating the vo2 max or awarding fitness badges. during a recent run, when I hit a new calorie record, i noticed the heart rate signal was missing. similarly, when running downhill, the heart rate becomes unavailable for a brief period. might be purely coincidental though.

[@Gab8riel]

Would you ever consider doing the doubly water method to test a watch's accuracy when it comes to calorie expenditure? As far as I know it would be the most viable method without using a ton of equipment, but I don't how accessible it actually is.

[@sidefury]

The series 8 is my first apple watch, i'm really happy with it! Your scientific approach to reviewing this product gives me a lot of confidence in my purchase 👍 love your content!

[@TheQuantifiedScientist]

Thanks so much!😊😄

[@besim109AOG]

Hi Rob, could you compare differents straps and heart rate changes? I feel like some perform better than others

[@daemonjii]

Need sleep tracking app video again with apple watch series 8. Would be appreciated if you could do a test of whether these apps can cover the naps automatically since apple doesnt track naps

[@morisruben9392]

So would you say this or the whoop 4.0 is better overall for sleep/health tracking with the added data from whoop but better accuracy from Apple Watch?

[@robertjleter]

Thanks Rob, I'm hoping for a vo2max comparison

[@sleepyli4653]

awesome video sir!! I have a question, im looking for a watch/sport strap that can meet these requirement 1. Accurate to measure for cardio, weifht lifting 2. Long battery 3. Support Samsung Phone I'm using it mainly for active life style and please gimme some recommendation by any chance

[@GadgetyMV]

Returning to devices long term and testing them against reference makes you unique on KZbin. Thank you Rob! BTW, 17:18.... Apple calling light sleep "core",... like that middle of the apple containing the seeds and where the stem attaches. Certainly marketing!

[@TheQuantifiedScientist]

Haha, good catch!

[@GadgetyMV]

@@TheQuantifiedScientist Thank you! 😃

[@Explorerashwin]

Good review

[@QuintinArlieNoggle]

Hi Rob, just wondering, did you had issues with the temperature detection? I've tried few options, but still unable to detect it (2 months now)

[@ritamix33]

Damn. thank you. that was thorough. you've solidified my decision to get the watch 😄

[@AhmedERaway95]

Hello Rob, a quick question. How much can we trust the amount of KCals detected by our wearables after different types of workout/exercises? I'm asking about my GT3 as an example!

[@spiritsavage]

Would love a review on the 965! Especially with sleep tracking!

[@natalieglowacka6841]

How good is the distance tracking for runs and walks. Also how accurate is the caloric level for activity’s.

[@DJ-ru4im]

This question is based on your recent video about the AW Ultra Heart Rate Issue: I am curious to know, does the fact that the lag is corrected in the Apple Health App affect your rankings for heart rate accuracy compared to other brands? Is the reason Apple watches are so superior to all other brands in HR accuracy in your tests due to the fact that this lag is fixed after upload, as you discovered? I suppose you could test this by seeing whether Garmin does not correct any lag. Then, if this lag is corrected, perhaps it would much more closely match the Polar H10 graph, and have similar results to the Apple watch? What are your thoughts on testing this potential theory?

[@elliotclarke5685]

Could you do an updated review of the Garmin Epix 2, now that it's been out for a while and has had a number of updates?

[@cunninghamster]

Hey, love your KZbin channel, long term subscriber. Can I ask, have you ever thought of testing watches on different body types? Would be interesting to see if some would fail on overweight people like myself as there would be fat in the way of the sensor.

[@TheQuantifiedScientist]

Hi Daniel! Yes, I was working on starting something like this today actually!

[@YuuriPenas]

Can we also get a ECG accuracy test?

[@NicksStuff]

Hey! Have you ever thought about doing body composition scale tests? That would complement your work on watches

[@TheQuantifiedScientist]

Hi! For sure Nick, just need to figure out good ways to do it

[@Interactive-Tech]

@@TheQuantifiedScientist Definitely interested in this! The "gold standard" is DEXA scan. I'm super interested in how it stacks up against InBody's commercial scale vs. some other home scales.

[@derksenjenny]

I love my Apple Watch, I had the ultra but I sold it and bought a series 8 stainless steel for that money. I really like the sapphire glass because of the scratches. The only thing I mis is the better battery of the ultra. But I really found the ultra a bit to heavy. But in general great watches. It keeps great track of your overal health. Thanks for the great in-depth reviews

[@marianabosnjak4394]

Hi there! I have a bit of a bold question 🤭 I'm considering to upgrade my Apple Watch 6 to an series 8 because of the temperature tracking. However, I can't find any reviews made by women about cycle tracking with this sensor. Would you like to share your experience with this feature? It would mean a lot, but of course, no pressure if you don't feel like it! ☺

[@derksenjenny]

@@marianabosnjak4394 it works really wel, it tell you when you ovulated. But i have no way to check if this correct. It predicts also my menstruation very spot on. It give me a warning 5 days a head. I find it really useful. My menstruation was two times to long, and it warned me to see a doctor for this. I really find it really precise

[@Coco-xi9hq]

Any idea if we can wear the apple watch on our bicep? would this cause a big difference in the readings? looking to wear it on my bicep for BJJ. thanks!

[@puzzlewong178]

Can you do this kind of video but with Huawei watch fit 2?

[@preetthakker4462]

Which EEG do you use? And what is it's price?

[@whyimustusemyrealname3801]

thanks for this dr

[@adrucho]

@TheQuantifiedScientist do you have a comparison review about ECG function?

[@nsiddhu]

I have an iPad, should I get an iPhone to use a watch? I have a iPhone se at my office mapped to a different account. Can I use the iPad or the iPhone se and still map the watch to my preferred apple account?

[@egeturker5195]

Can you test the older apple watches like s4, newer ones are almost the same on biological data so were they always good?

[@feign1192]

Please review the new garmin vivomove trend, thanks!

[@dibyendupodder7159]

Please test upcoming smart watches redmi or mi watch 3 or 3pro? I am excited to purchase this watch because it has a lower price for sleep tracking ♥️♥️😍😍🤩🤩😁😁

[@will74lsn]

is any of the Applewatches able to give you indices of HRV (e.g., RMSSD)?

[@emanueleluciani99]

Will you test Xiaomi Watch s1 Pro? It seems really promising

[@lbdlji]

Hi rob, thanks for the detailed explanation! Why is the SE2022 so bad compared to other Apple Watches in your charts? This was not the case in the video dedicated to it

[@sagebirchwood9948]

The SE2022 scored higher...

[@lbdlji]

@AK that’s what i’m thinking too 🤗

[@visoak]

Seeing that the Garmin devices are as good at GPS but not at blood measurements, I wonder how much of that performance is due to the strap. If you can rig an apple strap to a Garmin and compare heart rate and oxygen readings, it may be possible to determine the importance of the straps...

[@noellass2218]

Hi, is there any Smartwatch that you can use with an Android Smartphone where you can see your detailed heart rate of the past 10 or 30 min?

[@RyanGoderre]

What is the best overall fitness tracker by accuracy in your expert opinion? Apple Watch series 8 seems to be the best based on these statistics?

[@PeterMoueza]

Would be super if you ran test about VO2 max prediction of Polar (Fitness, RI,...)vs Garmin vs Labs test !

[@searchingfor6thgear44]

Great Channel. I spent a lot of time on here trying to decide between a Garmin and an Apple Watch. Got the Apple Watch and I'm happy, but not thrilled. I don't like the way it takes over my phone alerts to include ring tones for various people. Here's a challenge... Can the Apple Watch work just as accurately when worn on the inside of the wrist? I wear all my watches on the inside of my wrist to help keep them looking good with all the work I do. I have not found any "gaps" in the sensor's data collection, but you are the scientist who can tell us if it is just as accurate on the inside of the wrist as on top.

[@TheQuantifiedScientist]

Hi! Great idea, something to look into!

[@searchingfor6thgear44]

@@TheQuantifiedScientist The Garmin wearers talk about it improving the accuracy of their watches. Apple’ Marketing Department is terrified that someone wouldn’t see the watch being worn. They’ve convinced everyone that it is designed for the outside of the wrist and therefore won’t be as reliable/accurate. Quite entertaining.

[@krisvanaut]

Just know that the watches rely on a fair amount of machine learning to display heart rate. The models get updated quite frequently to improve etc. This is obviously a good thing. But is case of your tests, means that the results and findings will quickly become outdated.

[@judb2566]

These activity and health tracking videos are amazing. I've not seen such detailed information and comparisons anywhere else. Sadly, I'm an android user and when I reviewed your comments on the samsung and google devices they are not very appealing. Since I'm primarily interested in the sleep tracking statistics and SpO2 data I'll wait and see if they come up with devices that do better against your analyses. In the meantime I'll have to stick with my Fitbit Charge 5. Thanx again for your help.

[@ikramramli1716]

Hi. Hope you can do xiaomi s1 active next. Thankss

[@rdking8001]

Can you do reports from health data ?

[@seansull]

What about the energy expenditure? I found studies that said Apple Watch 6 is one of the most accurate for heart rate tracking but it still was inaccurate when it came to calories burned

[@freakno50]

It would have been great if you had added a section on emf radiation of the apple watch. I wanted to know if it emits radiation in airplane mode

[@loaldeeming3042]

I’d love to know what the best watch for heart rate and swimming is

[@Zedexification]

Hi there, how do I export the data from apple health to plot my own charts like yourself?

[@AleSponchiado]

Amazing!

[@gilly4711]

This is exactly the sort the data I was after 🙏

[@FA-tq9ip]

Why did you not test the ECG function?

[@dstr769]

what is a good app to interpret data similar to oura or whoop?

[@denzilfernandes129]

Does it track short naps

[@Chanel42597]

What about the battery back up I thinks its works maximum 40 hours on full charge

[@jordifontela3866]

Any reasons why apple watch sleep tracking seems always to underestimate deep sleep? If Im not mistaken, values of around 30-40min per night of deep sleep should induce serious health issues. And that are the values that the apple watch usually gives. Depp sleep should be around 20/30% of total night sleep. So for 8 hours of sleep = 1.3h/2.3h

[@ryanpatrick7086]

Glad I'm not the only one who's not getting enough deep sleep according to the Apple Watch. My 7 is telling me I usually only get 8-13% per night even when I wake up feeling refreshed.

[@elsidigothman1983]

You are Great 👍🏼

[@sansin6250]

Does the Ultra have the same limitations as the Series 8?

[@Itsduckx]

please do watch SE2 Long-term Review

[@lebron0307]

great video

[@TheQuantifiedScientist]

Glad you enjoyed it James!

[@bebierizka821]

Hey sir, dont forget if there is any smartphone like samsung galaxy s7, s8, s9 and s10 that brings a heart rate, spo2 level, and even blood pressure sensor on s9 series. I want to ask does they perform good enough because during covid era, i use my s8 and s9 to track the spo2 level on my family and i think it works well. And dont forget that samsung brings us this feature since good old days (before smartwatch with sensor was booming), and I was curious did samsung removed sensor on s20 series because they didnt perform good or just want to increase their smartwatch market. Thankyou.

[@berkolcay9674]

6:09 There is se 2022 at 0.70. What is the difference between that and apple watch se in 2nd rank?

[@PeterMoueza]

1:30 code 1:55 °C 2:39 rest 2:52 rest 15:38 yoga 32:49 see breaths 32:52 others 33:04 OS dependency

[@lfalcon88]

I bought one a few days ago... Not worth it... My plan was to use it to track my runs, but if you enable the GPS option, the band does not sync the workout to the phone... I looked online and it seems this is an issue the band has and Samsung has not been able to fix

[@aycan8390]

When will you do the test of the Huawei Watch GT 3 SE ??? Wait video...

[@leandrolgfreitas]

Great. May you consider do the same with Samsung Galaxy Watch 5 pro, please?

[@TheQuantifiedScientist]

Thanks for the idea Leandro!😊

[@UcheFiasco]

Please please please we need your review of the eight sleep pod 3

[@mariuszd.4909]

hmm its interesting as im most interested in tracking REM sleep - due to a thing that it can be linked with ptsd issue and too much noradrenaline at sleeping stage. As i understand from your videos, overall apple watch SE 2022 (2gen) is better in general sleep tracking, but apple watch series 8, looks like have little better REM sleep tracking because its around 80% accuracy, and not 70% accuracy as in watch SE. Or maybe it could be an issue with new algorithm and older video of testing Apple watch SE 2022 that was done before this new algorithm get out?

[@wolfred10]

Can you make an análisis of the apple watch clones and cheap watches at AliExpress pls?

[@denzilfernandes129]

Does it detect day time naps

[@francescob.3019]

i don’t understand how this can be so much better than the competition, what’s in there and why others can’t copy that?

[@benoitranger3856]

Great testing and video! Very thorough and interesting. Any chance you start testing calorie accuracy one this watch?

[@sastrych7866]

Such a great video brother ... Love from indja 🇮🇳🇮🇳🇮🇳

[@syawalibrahim6453]

can you do heart rate accuracy for garmin forerunner 255

[@peterwoolliams1283]

Maybe need to plot the RMS residuals from the correlation… help separate out the best where R~=1! You never mention the “p” value you report e.g. “p

[@hidden3573]

Great job but still nothing about amazfit gtr 4. What a pity!

[@marrachiglia]

you should publish these results

[@emdee1137]

Best on market 🎉

[@TheQuantifiedScientist]

Thanks for the feedback Emdee11!

[@sagebirchwood9948]

Please review the Pokemon Go Plus + sleep tracker when it comes out this year! (Announced today, 2/27/2023)