Mi Band 7 Scientific Review

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Timestamps:
00:00 Background
01:37 10 Things to Know
03:55 Heart Rate Test Spinning
07:41 Heart Rate Test Cycling
10:15 Heart Rate Test Weight Lifting
11:07 Sleep Stage Testing
15:13 Sleep Stage Test Overview
16:29 SpO2 Test
18:27 Step Test
20:15 Potential Issue with the Mi Band 7
20:39 Health Tracking Conclusions
21:28 Final Thoughts
Introduction:
This is the new Mi Band 7, which still resembles its predecessor, but now has a larger 1.62-inch always-on AMOLED display. However, as impressive as that beautiful and bright display is, can the new Mi Band 7 reliably measure and track your health metrics? Over the last few days I have done different scientific tests on this new Mi Band 7, and I found it seems to be good at some things, but also struggles with some specific measurements. Now, in other videos I have shown that the previous generation, the Mi Band 6, was pretty bad when it was launched, but it improved quite drastically with firmware updates. Let’s see if this new Mi Band 7 also needs some time to get good performance, or if it is already quite good from the start. In this video, I will do some initial scientific testing of the heart rate measurements, sleep tracking, oxygen saturation measurements and step counting of the Mi Band 7. Now, this is a first set of tests, as I just received the device this week, and a full scientific review will follow as I do more detailed tests over the next few weeks.
The first thing you will notice about the new Mi Band is that it’s bigger, with a 1.62-inch Always-on AMOLED display compared to the 1.56-inch display of the Mi Band 6, which according to Xiaomi, increases the viewing area by 25%. However, the pixel density remains the same as before at 326 PPI. Xiaomi also created new icons, new effects, and restyled data visuals to go with this larger display. The Mi Band 7 is said to have 120 sports modes, and now has continuous blood oxygen monitoring and low SpO2 alerts. In addition, the Mi Band 7 also has all-day heart rate monitoring, sleep monitoring and also stress monitoring, which as you might know, I am generally quite skeptical of. The Mi Band 7 is water resistant up to 5 atmospheres, similar to the Mi Band 6, which means it can withstand water pressures equivalent to a depth of 50 meters. The main thing that is lacking is that it still doesn’t have built-in GPS. Xiaomi says that the Mi Band 7 has a battery life of 14 days with regular usage, however, I haven’t been able to validate this yet. Also, a lot of the more advanced features, like always on display, continuous SpO2 measurements and stress monitoring will drain the battery faster. It is a bit unclear what the band will sell for in the US and Europe, but it will probably be around 50 dollars. Now, I was able to connect the Mi Band 7 to two different apps on iOS: Mi Fitness and Zepp Life. I ended up using Zepp life, because that was the only way I was able to export my exercises to Strava. I had to do it indirectly though, by logging into the normal Zepp app with the same account.

[@TheQuantifiedScientist]

🔴 Affiliate* links: geni.us/thequantifiedscientist 🟢 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 small 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) ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ Hope you enjoyed this initial test of the Mi Band 7. A more detailed test will follow in ~ 3 weeks!

[@AX-fx7ng]

Can you please share these correlation graphs on your website as a live visualization/ vector image or a high resolution static image/ PDF? Every time I wish to compare a few I have to go searching through the videos. It would really help with recall and summarize old and new tests across time.

[@Shoppenhauerrip]

I think you can analyze the amazfit band 7. They say their results are superior. Thank you for your work.

[@Nothing-pd9gg]

Thanks for in-depth review, any suggest which test should i compare if i use it for my running?

[@czimon]

waiting on the detailed review of the Mi Band 7! Hope it comes soon. :)

[@ZUTF1025]

Hi Rob! The new mi band 8 is out. And the manufacturer is different from the past generations. This generation is directly manufactured by Xiaomi, while the past ones were actually by Amazfit. I tested the accuracy of its optical heart rate sensor. Compared to my chest strap, it’s surprisingly accurate. Even does not have the 5 sec delay which the Apple watches do. Can you do another comprehensive review of the new Mi band 8?

[@thelostyaksha]

Other reviewers just read the brochure. THIS is actually a true review. Your efforts are really appreciated.

[@kirbytek6901]

i agree

[@overratedchannel1440]

I'm mind blown by the amount of effort you put in these reviews

[@cubiq1]

Hands down the best smartwatch/fitness tracker reviews on KZbin, looking at what _really_ matters.

[@koningklootzak7788]

He has lots of free time

[@cubiq1]

@@koningklootzak7788 I'm not so sure considering he has a full-time job as a postdoc researcher

[@koningklootzak7788]

@@cubiq1 sure if he doesn't have much work to do

[@marvcar]

Even when he's sleeping

[@fahmidani3947]

this is how youtube gadget reviews should be, not only mentioning the specs but also testing it thoroughly on daily activities

[@arkhamian7586]

I have never trusted anyone as much as I trust Rob and I have trust issues.

[@MegaFreakWave]

science my friend, the science... :)

[@beaconing7689]

Ye ok

[@vanjelly2258]

@Labellevie :D

[@brianchamberlin1539]

Some of the most effective serial killers had those abilities/skills also.

[@geno8079]

your trust issues is too low, trusting some stranger who's a youtuber

[@markknight2768]

I see Xiaomi just released the Band 7 Pro a few weeks ago and also a firmware update today that they say adds some features and improves others including heartrate, blood oxygen and sleep tracking. Would really like to see you do a full "Scientific Review" of this Band/Smartwatch in the future if you can. Thx for all your hard work!

[@Harunjo29]

yes +1 to this, xiaomi do regulary update of mi band firmware, and sometimes its related to mi band sensors accuracy

[@MemberOfGeniusSociety]

I think need to wait few months more

[@steveneustace2331]

I bought it straight away only to discover that it doesn't have the PAI activated. Something I liked on all the mi bands i've had. I returned it. I guess in the future they'll activate it🤔

[@SeeMoreLevingthon]

Yes, this. Please do the review of the Band 7 Pro.

[@enigmamyth]

@@steveneustace2331 I have Pai activated on my mi band 5. As you have used miband7 a bit, should I upgrade to it

[@manga4u247]

I wish a review like this existed for every product

[@simonb9898]

Even vibrators? 🤣

[@alphallama5586]

This review is absolutely ridiculous and incredible in equal measures. This truly is an amazing and in depth review. With a level of detail and accuracy that I have never seen anyone produce on youtube before. Instant sub and notification bell click.

[@orenhausler6292]

Thank you so much for this review! Made me go for this product, and I keep coming back to your video. I needed a device that's small on the wrist and tracks fitness data with reasonable precision and can help me gauge my sleep stats (primarily deep sleep) so I can understand how to sleep better. The fact alone that this records steps, distance, heart rate, and deep sleep accurately enough for a layman (coupled with my phone, it also tracks my exercise routes super accurately) is perfect for me in and of itself and this device has so much more to offer in terms of notifications when you reach your steps goal for the day. It tells you when you've been sitting for too long, has guided breathing exercises with vibrations on your wrist to help you calm you down, etc. I also have vibration alarms that remind me to go to sleep at a regular time and help me get up in the morning (without bothering my girlfriend!). Most importantly, this device is discreet and helps me gamify my daily exercise, making me walk more and and make an effort to stress less, and it generally gets me stoked to take better care of myself. I like wearing a classic wrist watch as my main watch, and I can just put this on the opposite wrist and turn off the screen. It's light and sleek enough that I don't even notice it's there. Also, the screen is awesome. Highly recommended!

[@DAXimusTT]

This is GOLD! Thank you for all the hard work done in all your evaluations. Looking forward to an in depth review of the Mi band 7 Pro.

[@glenswada]

I have had the Mi-Band 7 for a week and finding it awesome given its price point. Your research helps people understand the watches better. Thank You.

[@mkriiger]

I've discovered your channel on last weekend and immediately got addicted to your videos, I love this kind of analysis. Thanks for yout amazing work!

[@yodanvranx809]

Hi Rob, if you want to know what the stress calculation might be search for 'baevsky stress index'. The info page in the stress widget clearly says that the calculation / measurment is HRV based. The baevsky stress index was developed in the 60's for astronaut health tracking.

[@rick999h]

highly undervalued channel. Never have I seen such organized and scientific review for just an random cheap smart watch. Thank you for all your Effort. Continue and I know your gonna grow till half a million at least!

[@Im3Tje]

I really love your video's. The quality between your reviews and others are huge! Thanks so much for all the work❤

[@vinicus508]

Just found out about this channel and I’m stunned! I wanted a review on the miband but other than that I love statistics and statistical analysis! Great content, keep up the good work

[@lgude]

Thorough coverage. I have been using an Amazefit Bip for several years and was a bit disappointed to how poor it compared to other similar devices. So this review made it clear that I should consider replacing it. So I will subscribe and make up my mind on the basis of you reviews and my specific needs. One note, I don’t want something like the Apple Watch that requires daily charging. I really like the Amazefit I have because it goes for weeks. Thanks

[@FernandoMoodyMusic]

I actually tested the mi band 7 against my polar h10 it was only off by 5 points or so for the HRM. Not bad tbh. It's a good fitness tracker I'd highly recommend it.

[@soupglasses]

What activity did you test it with?

[@pouriakhanbolouki3855]

Love your content. your videos helped me choose a device with much higher confidence. Here's an idea to quantify the accuracy of the GPS data. Export your GPS data on the map as a png (Screen clipping should work), then with a digitizer tool such as webplotdigitizer, get the x and y coordinates of the tracks with a predefined spacing. For the reference, use a predefined route, drawn on the map or imported, then export the coordinates with the same spacing values for both x and y. The difference between two data sets should be straight forward from there. Admittedly, this approach doesn't include the time variable of the acquired locations for the track. But probably, that does not matter much as long as one data point at a stationary location can be confirmed that was acquired within a reasonable time frame. Let me know what you think if you read this comment.

[@Lucas-xp7nm]

great video! I'm looking forward to the promised full review, to see if they've corrected the inaccuracies via the update - as well as a scientific review of the MiBand Pro.

[@ScorpiosLifeLog]

Yep, I’m buying this one. God bless you for the great efford you put into these reviews. Looking forward to see your videos in future 🙂

[@agustinramos94]

Dude, this is what i have searching for a lot of time, every video who i see is about comparatives of the apple smartwatch, but no one is with medical things, you have won a sub! :)

[@waitingforthursday]

Came across your video while contemplating whether to buy this device - thanks for the effort and for providing such unique insight into how these devices perform for people with different tracking needs!

[@DipBuyer83]

I have the MI band 5, and love it. I really like the sleep data, like resting heart rate. I love the PAI data also!!

[@ageingungracefullypushingt7135]

I was so impressed with this review I subscribed. Outstanding job!

[@frida_otras]

Hi! Thank you for the scientific review! I appreciate it sooo much! I had to let you know that the Mi Band 8 is out, but in CN Version for now. Global Version are rumoured to be released by end of 2023 but we'll wait and see. I'll be waiting for your review on that before getting one. Thank you for all this amazing efforts for the reviews 😊✨️👍🏼

[@moireldsc]

Thank you for another great video! I'm doing the rounds on your videos trying to find a fitness tracker thats best for my needs since it is my first time buying one. You're certainaly giving me lots of great data to use!

[@emmyukoustic]

Great video as always! Looking forward for mi band 7 pro scientific review next! 😄

[@yodanvranx809]

Thanks a lot Rob for this promising outlook. Eagerly waiting for the final report. Also a question if you don't mind: is the xiaumi s1 watch (active) on your radar?

[@FinalFantasyCastleva]

Thanks for making such great reviews!

[@jreverie7018]

I got this thanks to your review, it's already had some new updates which is good:) the Spo2 seems very accurate. it also can be left on all day which suits me well. thanks again

[@yodanvranx809]

Hi Rob. Just a question. Does it make sense to wait for the final Mi Band 7 review that you announced months ago? Appreciating all your work and efforts.

[@usbsol]

You seem to love watches (and science) - I think a fun project could be reviewing scales like those from xiaomi. There are part of the self-tracking ecosystem and have so many datapoints to look into. Cheers for all your reviews so far 👍

[@jackionendino4293]

Wow all efforts testing different watch with actual scientific devices is a THUMBS up. Thankyou so much

[@saiken811]

Glad I found your channel!! The effort involved in the video is insane!!! Subbed!

[@jamfera2]

Assisti com legenda em português gerada automaticamente pelo KZbin, deu pra compreender muita coisa, excelente análise. Infelizmente não tem vídeos em português com análise tão completas como esse... 🇧🇷

[@arnolfinilmf]

Sempre assisto, esse cara é o melhor

[@ancapistaovemai616]

Pra você ver o quanto você perde por não saber inglês

[@marcosrocha1429]

O melhor canal nesse quesito ❤

[@carvalho9021]

Saber inglês é bom demais.

[@MyLongevityExperiment]

Your Signal-to-noise ratio is excellent, many thanks.

[@MusicianGreg]

the amount of work you've put in the video.. respect man!

[@DrLate.]

I was waiting for this video . Thank you!

[@nabilahhakim725]

the review is very helpful!! I hope you do a review on mi band 8 next!

[@markmahood2019]

Really like the look of this new watch. The screen size is spot on.

[@l3exter]

I really appreciate the quality of the review. The results of the heart rate tracking during exercize is worse than I expected. I guess I'll have keep my apple watch 6

[@RalphAverbuch]

Very detailed. Very interesting. One intractable problem I have experienced since the mi band 5 is that whenever I swim it counts steps! If I swim for one hour it will track the swim quite accurately but also will count about 5,000 steps.

[@dynboots]

I also get steps when driving :)

[@jasonclarke7422]

@@dynboots That’s cheating 😂

[@Geektropology]

You helped me to decide and buy the band, I know it's not perfect or the most accurate but for the price and my goals, it's good enough, thank for your input, cheers from Ecuador!

[@georgebarros6095]

That's how a review should be made. Awesome content!

[@eibmobsabu2781]

Excellent review! With this video, all my doubts of these smartbands has been scientifically answered. Thank you Sir!!!

[@sabriskf]

I was waiting for this vídeo. Thanks! ✨

[@FelixAnderson_]

this is amazing! very informational, thank you very much for this video! Subscribed!

[@ronny.wijaya]

Rob, you are my favourite smart watch/activity tracker reviewer. Very friendly and clear explanation. 4 thumbs up 👍👍👍👍

[@gracelan7336]

Does the mi band 7 allow the use of its timer app while monitoring workout eg Freestyle training or Indoor fitness at the same time? Great video! Amazing video, love it!!

[@hugask]

Loved the channel, you really take it serious Gonna wait for part 2

[@zackdamion9286]

Thank you for your vidz. Your visuals are great, speech is well paced and easy to understand.

[@sari54754]

You are one the best gadget reviewer I have ever seen in you tube. Very convincing with lots of measurement data.

[@JoaquinIM.]

I just stumbled upon your channel and I'm mindblown by the effort and precision of your reviews! I have a request for more Garmin devices to be reviewed, like the cheststraps and Garmin 735xt, I have the watch and I'm considering getting the hr strap for health reasons, I hope you can make it happen! You have a new subscriber

there are 2 things I like about mi band over huawei band 6: higher screen dpi, stronger vibrator and better compatible with iphone (music control and some small stubs)

[@123rasna]

Useful as always! Thank you. Please review the new mi watch s1 soon. Can't wait to know if it's any better in accuracy

[@einerus]

Good review, as always. I would like to see your take on PAI health points system one day. It's on this and other xiaomi bands.

[@mistress707]

First time here and I've liked your video literally 1 minute in 👌 Great job man, Amazing & thank you 👏🙌

[@timeTegus]

Finally a review with acual information that is helpful. Normaly reviewers just read the specs

[@TedBrk]

Love this channel! Would be great to see if the firmware updates fixed some of the issues. Especially interested if the sleep tracking and outside heartrate improved. The firmware updates usually only indicate 'fixed bugs' - so that doesn't tell you anything. Probably a lot of work, so can understand if for such a cheap device it is not worth the effort. Subscribed!

[@jirip8276]

Thanks for the review. Do you have any webpage with comparisons and overview of different products?

[@fatihgul77]

Thank you man. Really very detailed and trustful review. Waiting for mi band 7 pro. And best sleep tracker

[@googlekullancs564]

I don't know when mi band 7 full review will come, but waiting for it, to see how the band is improved. Already got 3 updates, probably will get couple more. Hope it will be better and bang for the 💰🤑

[@swingstylez]

Thanks so much for your detailed and metric based reviews! After watching your review, I decided to buy this as my first activity tracker. I owned the vivosmart 3 for a few days before returning it, does that count? Anyway, I see that the watch has an option to enable "detailed sleep tracking" requiring extra power. When testing, did you have this option enabled? Did the option even exist in the firmware at the time you tested?

[@ralllao7295]

Hey, loved the scientific approach. Would you be interested in doing the same research for Xiaomi Mi Body Composition Scale 2 tracking accuracy? Or are you narrowing the focus to only watches?

[@krzysztofbaranowski9491]

Great review as always 👍. When can we expect a review of Huawei Watch Fit 2 ? 😁

[@artsyhyd]

Glad someone is reviewing the accuracy. This is the real question.

[@abhimanyupandey9740]

Amazing videos, especially with the amount of scientific analysis you do on different products to let the consumer what's the best wearable for them. :D If you don't mind, could you do an analysis of Pebble Cosmos Luxe SmartWatch? Thank you :)

[@ethanchong6372]

Hopefully in future can do a review on mi smart band 7 pro😊😊. I have seen a lot of review said it’s not accurate (but believe it’s not that accurate) since it’s a budget smart band. I will look into it! Thank you!

[@oscardanielmendezruiz9248]

Estaba esperando este video, muchas gracias

[@SoreBrain]

Excited for the full review

[@firantemilan]

I was waiting for your this video. Thank you.

[@carvalho9021]

I woud like to express Gratitude for u to making this review.

[@sk90y]

I have same issues with heart rate tracking. I do low impact cardio, elliptical and rowing. It's very good at updating regularly during rowing. But with the elliptical, it just doesn't update often enough half the time.

[@ralphseifer5537]

Extraordinary analysis. Many thanks.

[@pedroemilio7264]

Wanted so much for this review, i hope xiaomi fixes the HR issues with firmware updates. Just a question, can you imagine why most watches struggles specifically with the rem sleep of the sleep tracking?

[@Spacemonkeymojo]

I would say it's because REM sleep would be hard to quantify based on a wrist-worn health tracker. REM is characterised by brain waves, something a wrist-worn tracker can't track. REM sleep might affect heart rate or HRV but the effect is probably similar to deep or light sleep, which is why fitness trackers tend to get them mixed up. Maybe something else like skin temperature or something changes during REM, which could be tracked, but that would require the tracker to have a skin temp sensor which I don't know if many actually have. Sucks because I would like to track my sleep stages, that headband Rob wears looks like a good investment for those who want to track their sleep stages.

[@Cr7pt0_]

@@Spacemonkeymojo I think the Galaxy Watch5 will have a temperature sensor.

[@Gfanucci]

Notice that MiBand 6 was much better than Band 7 for HR. The 7 does need improvements in firmware to match algorithms with specifics of the sensor, it seems.

[@svetoslavkyosovski5239]

Hey there and admiration for your efforts! From all budget smart bands/watches, do you think that one has the best sleep tracking? Which one you will recommend for sleep tracking (from the budget ones)?

[@garyrooksby]

Very thorough and helpful. Thanks!

[@GopalanMD]

Waited for this review! ❤️

[@Ike92]

This is the only review i want to watch. Thanks! amazing

[@Maximum_Natural_Muscle]

We are waiting for the Mi Band 7 FULL Scientific Review! You are doing a great job . Thanks

[@kitsune-moon]

I would like him to redo it because they corrected some errors they made corrections in the software.Ah sorry I don't know English so maybe I have very wrong words

[@Maximum_Natural_Muscle]

@@kitsune-moon there is no firmware update yet... So it's still the same

[@hueything228]

Thank you Rob. If possible, could you do a review of the sleep tracking for Garmin Fenix 7 watches after their latest update please? Anyways great work!

[@francobellomo9979]

Hi Rob, Excellent video! What is the next werable to test?

[@mrgauravmalik]

Hi ROB !!! Could you please post the result of scientific tests after updates that have been sent for the recent firmware updates . Also, pls indicate clearly as to where its standing in the graph from worst to best smart bands.

[@thaohuynhm]

Hi Rob, I really like how you rate with stars for features. It's easy for viewers

[@XA0C2U]

Wow! This is remarkable content quality. Looking forward to new videos!

[@amrothfaelivrin]

Your reviews are one of the best out there. I hope you can also do a review of the new mi band 7 pro and xiaomi watch s1 🙏🏼🙏🏼🙏🏼

[@muhammadluqman2038]

omg, i waiting for this ..thanks for the detailed review 🤝

[@dirtytalkien1653]

Thanks for the review. Could you please include to the next video a heart rate measurement accuracy after running?

[@granearl2438]

Mi Band 7 tends to read slower heart rates when not adjusted properly. Make sure it's a bit tighter than usual when doing very movement intensive exercises. Otherwise, looks like a good review.

[@thePavuk]

About these results in 8:40. I have Mi Band 4 and it acts similar. Usually on the begin (20-30 minutes) it measures low HR (~80) then there is usually gap for few minutes when it doesn't measure at all and then it starts to measure correctly.

[@hajjianh]

I have been watching your videos for the past 2 years. I love your analysis and detailed reviews with all your recommendations.

[@vissaf]

Man this is some in depth research. 👏👏

[@ahdemircan]

Great review, very useful. Thank you.

[@claudibran584]

Hi Rob! It would be nice if you would start reviewing health monitoring earbuds (headphones) as well, for us. i.e: Amazfit PowerBuds, Amazfit PowerBuds Pro, Philips TAA4205, Philips TASN503. There are planty others as well. Some only with Heart Rate feature, some with other metrics (accelerometer gyroscope etc). Heart Monitoring from these seems to be more precise than a wrist based smartwatch. Thanks! &Keep up the good work.

[@josefernandobarbaflores9731]

Thanks Rob! Any plans for importing and reviewing the Huawei Watch D? I bet you are definitely interested!

[@arnolfinilmf]

Waiting for the complete review!

[@mboiko]

The Mi Band 7 Pro was just announced the other day...please test when available.

[@thaiming1306]

Wow awesome. Thats some dedication bravo.

[@manuel-xax]

Awesome review ! I am a MiBand 5 owner since Octover 2020, now considering to buy the 7 version. I think I will, having seen your video. Tennis is my favorite sport, I am curious about this mode, since my 5 does not have this tracking exercice. I noticed that my 5 was having trouble when biking outdoor, especially if not squeezed enough while descending uneven grounds / tarmac (adjusting the bracelet fixed this, while sacrificing a bit of confort).

[@otaruemma3803]

I was using mi band 5. Got 7 and I don't regret it

[@manuel-xax]

@@otaruemma3803 I bought the 7 over a month ago. I've enjoyed the tennis tracking, counting my forehands and backhands 🙂 Yet there are few things I like more about my 5 : like instant screen wake when touching the bottom of the screen. There's a somewhat half a second lag between touching the 7's screen and the screen displaying anything. I still need to configure the 7 properly, replicating my 5 settings, for I didn't took the time needed. On the plus side, I love that torch-lamp. The display is far better, hence induces this drawback of fewer battery autonomy.