Polar Verity Sense Scientific Review (versus OH1+, H10)

[@dogansengun]

Your scientific and unbiased reviews are a blessing for internet and informed people. I am sincerely grateful. Thank you and keep up the brilliant job you're doing. 🙏

[@TheFeatalion]

I've been using Polar Verity Sense for a month already. What I have found is that a biceps is not a good place for it when I, for example, do boxing or weightlifting sessions, because of a muscular traction. I use it on the forearm of my second hand (a Polar recommendation) and place it away from brachioradialis. I have nothing to compare, unfortunately, but I experience less weird jumps of an HR curve in this case.

[@TanyaScorpio]

Thank you this was helpful. Because i ordered the Verity earlier today. My need is to check my heart rate when I'm with my trainer doing weights, Tabata or other exercises. Plus my non-training days where i do cardio yoga etc. I debated on getting the chest strap but thought the strap mat irritate under my sports bra. Do you know. Is it possible to use the Verity against my chest where my sports bra acts as the strap? Thanks again for the tip...

[@user-pf5xq3lq8i]

Can it be worn on the leg?

[@rainerrain9689]

@@user-pf5xq3lq8i Do one day on forearm and one day on leg and compare readings.

[@spammalo8284]

I was going to suggest exactly the same. Forearm seems to be a better place to put the sensor in when you do weightlifting exercises. It will be great to have this analysis, to see if data now is more accurate. Btw this is a great video. Thx for your work.

[@asencyel]

i think using the term "ecg" while only comparing heartbeat average readings' accuracy and hysterisis zones between optical sensors is quite misleading. if we can not derive quantized wave pattern graphs from these sensors we should always emphasize heart beat rate monitoring is different than sinusoidal rhytm pattern analysis, just my 2 cents. please keep up the effort bringing latest model devices to the portfolio, your ongoing standardized comparison is much appreciated and one of a kind!

[@jamesw2831]

I've been watching your videos for a long time and this is the best wearable I've saw in tracking weight lifting because most of the wearables fail here. I mean yes, it struggled, but it caught the overall trend better than anything outside of the Apple Watch. It detects cardio sessions extremely well.

[@highseastrader4190]

The graph @2:46 is genius 😍 As the accuracy is very différent between cycling and weight training, maybe you could have included separated graphs for those 2 activities? We could have a confirmation of the good results on the bike/bad ones with the weights 😉 I have a Polar OH1 and happy with that, but the battery life gets poorer and poorer so I consider buying a H9 strap. Thanks again for this great review 👌

[@jamessmith49800]

Excellent videos! I'm super curious to know, after testing all of these devices which ones if any do you actually personally wear?

[@JaredClarkBoaz]

He wears an Apple watch in his videos, so I'm gonna assume that's his daily driver watch.

[@ltcdpl]

Rob please make a video listing your favorite smart bands/watches including cheaper ones. Ever since I found your channel I don’t trust anyone else’s opinion haha

[@Nikita-vq2mo]

The most informative video about the Verity Sence, great job, thank you.

[@cliffcox7643]

I think it's good enough.. So long as it gives the average HR to within 4 beats, it's perfect.

[@GadgetyMV]

Great to see your informative, thorough and reliable reviews. For swimming the Verity Sense is used against the temple for greater accuracy. For weight lifting, perhaps you could consider wearing it with a headband and remeasure for a comparison.

[@rmbd2b12]

Agree, would also be nice to see accuracy during leg only weightlifting exercises when you use the verity on the arm. That would clarify whether the inaccuracy is due to placement on active muscles or weightlifting itself. On his apple watch 7 review, the watch is on his wrist. would be nice to see weightlifting comparison between apple watch 7 and verity placed at wrist.

[@micahhlc]

I always like science based fact based KZbinrs! Respect!

[@MattJonesISOHEALTHBJJ]

Brilliant assessment! Thank you for being so thorough and so methodical.

[@JasonRaneses]

My favorite low cost and flexible tracker

[@Xariann]

I was wondering if flexing your muscles would interfere with the readings, so this answered my question.

[@Ionut04]

I hope to see the review of garmin venu 2, it will be interesting ✌

[@kryptonegalaxy3004]

big thanks... i got the answers im looking for .... and agreed on the slight reading differences due to the arm muscle exercises....since its using optical sensors.....

[@jmj5957]

Nice work again!!!!, hope you can make a full review and test of the garmin vivosmart 4, seems to record a lot of data, but now I always see your reviews before buying this kind of devices!!!

[@equsnarnd]

It would be very interesting if you were to rerun the test for weight lifting doing dumbbell squats, bicep curls and chin ups. Use the H10 as a reference line but this time hook the two optical sensors to a head band at the temple to avoid arm movement interfering and/or to your waist band to pick up femoral artery activity. I have an OH1 arriving in a few days and am eager to compare it to my Garmin Fenix watch attaching the OH1 to a headband while doing a sprint routine on a treadmill.

[@yousifsandokji2063]

Impressive work bro.

[@eesa_1980]

Great review! BTW, 9:57 what HRM apps are you using here?

[@equsnarnd]

Do you have any thoughts on why the 'wrist worn' Apple watch, which is subject to all the problems of all other wrist worn sensors, is yet able to achieve the accurate results of the H10? Is it superior sensors which cost a lot that makes the difference, or is it the algorithm that processes the signals from the sensors or is it the circuitry that it all runs on that makes lag time a non issue? What are they doing that other watch manufacturers are not doing? Does Apple say?

[@ShaferHart]

Better sensors and they actually take the health aspect of the Watch seriously they aren't just selling a gimmick to uninformed consumers. I don't use anything Apple but that's the truth.

[@danirana9311]

They use different technology

[@Yogamer2845]

Hey Rob excellent reviews like always. But one question can you please review the Amazon halo?

[@MikeTalws]

Hi Rob. Excellent review as always. Do you have any plans on reviewing the Wahoo Tickr Fit and compare it with the Polar Verity Sense?

[@minh1391993]

It's fun to see your heart rate during the sprint workout. I can barely maintain the high heart rate at the peak that long. :D so sad that's I can't share with you my data for swimming since I only own the oh1+ lol

[@TheQuantifiedScientist]

Hi Minh! Everyone's different. As long as you are healthy, all is good 😊

[@LAlberticoS]

I have both, and in my experience, comparing it to the Polar H10 chest strap, the Coros armband is more reliable in its measurements and significantly more responsive in most situations. I'm saying this after only two workouts, but this is what I've observed between yesterday and today. Honestly, the Coros surprised me; it responds almost instantly to changes picked up by the Polar H10, with perhaps a 1 or 2-second delay, which is excellent. I have a Garmin Fenix 8, and it takes a bit longer to react-around 3 seconds-though it’s also very reliable. The Polar Verity Sense takes between 2 and 3 seconds to react, similar to the Fenix 8, but it’s not as reliable. At lower heart rates before starting an activity, it tends to stay 2 or 3 beats per minute higher. So, the Coros is extremely reliable and also reacts very quickly. As for comfort, the Coros is much more comfortable due to its curved shape. The Polar is a bit uncomfortable because of the rounded edges mentioned in the video. Also, the Polar needs to be turned on manually, which is slightly more tedious than the Coros, which activates automatically when you put it on. However, there’s one significant advantage of the Polar: its ability to transmit PPI data to connect with HRV measurement apps like Kubios or Elite HRV. The Coros cannot be used with these apps. For people who want to monitor their recovery, this is a crucial feature. I use a Polar chest strap for these types of measurements since they are more accurate, but if you don’t have one, it might be more interesting to opt for the Verity Sense. Even though it doesn’t respond as well to sudden HR changes and may not be as effective overall, it’s more versatile and can be used with apps like these to track training recovery and also monitor sleep quality during the night with professional apps like Sleep2. In conclusion, I prefer the Coros because it’s super reliable and reacts quickly, but for others, the Polar might be more appealing due to its ability to record workouts on the device itself and its PPI data transmission capability

[@alexsalerno6018]

I have apple watch 7 and i bought Polar verity sense (it will arrive in two days). I think this could be a nice couple!

[@leedaq7767]

thank you so much for the review and your time

[@drcapt]

I love your videos. Would love to see you try out a Continuous Glucose Monitor. Its become really popular wearable for not just diabetics.

[@georgesabikhalil186]

Great video as usual!

[@gabrielsvdc]

Amazing, this helped me a lot!! Subscribed!!

[@100nirosta]

Hello. When will polar H11 come out? 2. Will the new Polar H11 have SpO2 measurement? 3. Is thick chest hair interfering with pulse measurements?---,.

[@YingWooWang]

Hello Rob! Amazing scientifically data driven review as always! Thank you for that! I was also wondering if you're interested or considering analysing accuracy for smart scales like the xiaomi ones or inbody, it could be something you can add to your list if you're running out of products to test.

[@TheSmiaf]

If u are interested in the BMI part I can already tell you this is never accurate. BMI hasn't aged well anyway. Bodyfat percentage very complicated thing to measure and calculate. Maybe lookup a video on this topic. But who knows he can still compare it after have done skinfold measurements and a scan or something 😅

[@YingWooWang]

@@TheSmiaf Aha! I see I see! Thank you for your reply!

[@adriant.4215]

Thank you Scientific Pewdiepie :D

[@nugrahaprihutama8789]

polar verity sense or polar h10 ? for cycling, running, walking, gym

[@communicationiskey-]

I do not think HR monitor straps are made for lifting weights, if you like using chopsticks to drink water why not :) You sold me on the H10, just strap it on and exercice. No buttons, no thinking about which light is on or off… Thank you

[@mickeyflanagan4019]

Great job. Thanks for the review

[@sahilrajput6161]

Keep the good work going

[@miniorava]

Hi, thanks for the review! :) How about running or swimming? And wearing the verity sense on the calf during weight training, would it help with accuracy? You should make a video to cover these as well ;)

[@andreapas89]

Hello! Great video! Thanks for you hard work for the fitness community. Would you recommend thise 2 products for someone weho does calisthenics, that it's not weight lifting only? Thank you!

[@KevinMcKinneyFilms]

Can you do a swimming heart rate video? There are not many out there that aren't 3 years old.

[@FelipeJunqueiraPenteado]

Hi Rob I recently discover your channel and thanks for all the data and analysis you made, they are top hi level analysis and as engineers I LOVE it! Can I ask one think, GTR 4 ou TRex 2 are capable to sync with VeritySense? Because I just want good tuning readings, cycling readings and swimming readings, and VerySense I almost good as H10, but for me maybe more comfortable in the arm than in my chest. So I’ve decide to change my GTR 47 because GPS aren’t good for new one GTR 4 or maybe T-Rex 2, but I am just to make sure, if you have it to test, sync VerySense with one of those good and no so expensive smart watch’s.

[@callan888]

Great review, liked! Rob, do you know if the verity or oh can pick up stress or hrv when paired to the garmin venu sq?

[@sensovision]

Thanks for the review! These results are looking very promising and now I consider getting the one for myself. I wonder if you have plans on reviewing TICKR FIT from Wahoo as I've got an impression that it's more comfortable to wear and that's the only reason for me for switching from a chest strap.

[@dmitryagafonov9096]

Excellent very well structured content, as usual. Many thanks. What about top Polar watches like Vantage/V2? Do they perform similar? Also would be interesting to see how they perform in your sleep tests. Hope for next videos :-)

[@Asthbendriel]

No, they perform worse, but it's not a problem of the sensor itself, but the position of the sensor in the body. The wrist is further away, introduces more noise to the signal, is a smaller area to collect data, and other factors makes it far more complicated to read data from the wrist rather than the arm or the forearm. In exercises like running, walking, biking and similar where there is little movement in the upper body and the wrist they perform quite well (despite the obvious delay in heart rate changes due to the further away position), however in exercises that involve tension on the wrist like weight lifting, they perform very poorly, measuring half of the HR quite often.

[@MariusBolldude]

Great Video !! But I don't see a problem with weight lifting, because you can put the verity sense even in your face (thats what was told in another video I've seen, because there is a clip for diving goggles to put it on your eyes temple) or on your legs or other party you don't use at the moment of weight lifting 😄

[@johngorentz6409]

How about testing in cool weather? This spring when temperatures were about 40F I learned that my watch gave crazy numbers as I'd start a bicycle ride, and then after a while gave plausible numbers. That sent me to the internet to learn about the problems in cool weather. I'll probably get an arm band device, but it would be good to know if any of them are better than others in cold temperatures.

[@danirana9311]

Guys he is a apple fan boy after whole day of research this is the best option after apple watch .. even though he does not recommend it and just says apple watch do you think we would even watch your videos if we were not looking for alternative

[@davsinghm]

Hi, I heard that Scosche Rhythm+ 2 are super accurate optical HR sensors. Could you please evaluate those with your testing as well? 🙏

[@michalgala267]

Hi Rob, thank you for your review! Could you tell me what are the app that you are using at 9:50?

[@LEYGSL]

Can anyone recommend the best watch this can be paired with to monitor real time results as opposed to needing to check on your phone?

[@zeyadazmy3036]

Hey man amazing job ❤️ can you make a study on galaxy active 1,2 or 3 ? That would be amazing ✌️

[@roberthoughton7955]

Hi Rob, do you know the sampling rate of the Verity?

[@imperatormouse2735]

9:55 What apps did you use for cycling? Looks useful...

[@AhmadQbc]

Please make a video about the differences between WHOOP Strap 3.0 and polar verity sense

[@richardwentworth439]

you're the best!

[@pramodb.n.8847]

Nice review. Can you do the review for Noise Colorfit Pro 3 snartwatch ?

[@johnmembrane]

Will the verity pair with the Apple watch/ I ask because I would like to view my heart rate in real time. Excellent video btw, thourily enjoyed it.

[@canyonblue737-8]

it certainly can pair with the Apple Watch.

[@christian513cs]

Thanks for this video

[@weimingcheng4879]

hi Sir, can you do one video to introduce how to disassemble OH1? Mine battery is broken, although I bought a Verity, I don't know how to use it independently. OH1 can be used without mobile, while it seems Verity can't. If so, a little bit pity。

[@rashidiqbal6871]

Wich model of apple watch are you talking about series 6?

[@raviabrol3804]

Thanks for great reviews. As a scientist myself, I have enjoyed your videos. Is there any armband strap on the market with an HR display? Scosche Rythm24 has an HR color code display but I am looking for a digital display in an armband.

[@johanjehoul3329]

I am looking for a device to replace my Fitibit Charge 5 which I love, but cannot wear during the day. I work in a hospital and cannot wear any rings are watches due to hygienic and anti-infection measures. Could the Polar Verity Sense or OH-1 in conjunction with my smartphone give me a heartrate tracking during a whole day, with overview of something like zone-minutes as the Fitbit Charge 5 does?

[@ED-988]

Great video. Have my like and comment.

[@ZadakLeader]

I was about to get the Polar H10, but i saw that it uses CR2025... Crazy. And while you can get rechargeable CR2025, that's too much work

[@TheQuantifiedScientist]

Hi! Luckily it lasts a really long time. I use mine daily and maybe change it twice a year

[@ZadakLeader]

Hmmmmmmmmmm, I am really conflicted, haha. You use it only when working out?

[@alicksasylum]

@@ZadakLeader It has a batterty life of approxiamtely 400 hours

[@ZadakLeader]

@@alicksasylum Yeah i ended up getting it after all. It's great

[@fuadmonsoon]

Suunto 9 BARO Heart Rate Accuracy test please 😉😉

[@jussipitkonen2713]

Very high quality studies. Vielen Dank! Have you or anyone tried OH+/Verity with Rowing (Concept 2) or Xcountry skiing, both are aerobic sports, with arms involed. Would the resulst be closer to weight ligting than biking (more error..)?

[@MattLaVoie1]

On the /r/rowing sub-reddit I've read that people are very happy with the verity sense with rowing on the Concept 2. Some people hit their chest strap HRMs at the end of strokes and so they find the arm strap to be 10x more comfortable. They say it works great with the Concept 2 PM5 and ErgData (the phone app that tracks your Concept 2 workouts). I'm considering getting one for the same purpose.

[@melvinch]

It now works with Sleep for Android. Would be good to see the sleep-tracking of this combo. 😉

[@LEYGSL]

What is the full name of the app pls, i'm trying to search for it.

[@matthewlehmann9682]

@@LEYGSL It's just called Sleep. Or search "Sleep as Android" and you'll prob find it that is the old name.

[@ramosmiguel1977]

I bought a Polar Verity Sense last week and used it yesterday for the 1st time with my Fitbit Inspire 3 (both at same time). Are you interested in the files for comparison of performance?

[@nsm1091]

Very good and detailed review as always . Tell me if I am right .. seeing several of your videos I presume you suggest FITBIT to have best PRICE to FUNCTIONALITY ratio ??? Am I right ????

[@samius1149]

How does the Verity Sense do for sleep tracking though when paired with an app like Sleep Cycle alarm clock?

[@patmagroin9950]

can you use the band in the legs? maybe if could use it n the legs if you're doing arms, chest, back workouts and then switch back to the arm band to do legs workouts?

[@garluis23]

Hello Rob and quantified fellows, do you remember the jawbone up devices? I really liked those ones because they were quite inconspicuous and minimal, also it could be worn with a wristwatch, don't know how accurate those devices were but I was wondering if there's anything like that today, I've considered rings but they're kind of big for a ring and I would like something that had sleep tracking and could be worn on wrist not just clip it on clothes,

[@TheQuantifiedScientist]

Hi Garluis! Yes, I do. I was thinking about it the other day. I considered buying one once (it was called the UP3 or UP4 I believe), but they did not provide good data access, so decided against it. Did you ever use one?😊

[@garluis23]

@@TheQuantifiedScientist Yes I had the first gen one, I used it to try to improve my sleeping habits and use the step counter to compare my jump rope workouts. I guess the tracking itself wasn't good but I really liked the no screen approach, no distractions with notifications and the look of the device. I haven't seen that approach again. I think a device like that with decent sensors would be killer

[@LeafBurrower]

Any reason why you couldn't wear the Verity Sense in the same place as an Apple Watch (i.e. wrist) and then compare how it performed in the various tests? Maybe next time...

[@Franco-on7yw]

I use to see yours videos and I have a question: how much does reading frequency influence accuracy? Have you considered it??

[@mukeshmohanty4001]

Can you please test Garmin forerunner 45 or 55 pls

[@SamsonFernendez]

Hi Rob, any idea what technological/hardware advantage does the apple watch has over other optical heart rate sensors? Why does it perform so well? Cant be purely algorithm wise, right?

[@thomasg5767]

Could you theoretically put the sensor on your leg and measure from there or wouldn't it give any valuable data?

[@Mattyuk1]

I have decided to buy this based on the evidence you gave me. Can you please do a video on the Polar chest strap and find out why most of us are getting burns from the chest and sweat rashes from the back. It's taken me over 4 months to treat this problem, so I've lost out on 4 months of Zwift.

[@jeffw654]

@matthew matthews I use kinesiology tape to try to minimise chafe but it may also limit accuracy. For this reason, I have just bought a verity sense but I haven't received it yet

[@Mattyuk1]

@@jeffw654 The polar is perfect and I get good accuracy using it. Thanks for the great videos.

[@increasingsun]

​@@Mattyuk1hi your experience for 4 months? Can i still take it? And i have heard that connection issues with strap, is that true? Also i have fossil gen 6, can i pair the strap with any watch for the data and any app for the same?

[@Mattyuk1]

@@increasingsun Still using it and have zero issues. Was a great buy with no regrets at all.

[@johnmembrane]

Thank you.

[@code3xiv]

Please review the Amazfit Neo hrm accuracy. Thats all i can afford at the moment. Thanks.

[@bmp713]

Is the Verity Sense the same exact size as the OH1? Can if fit in the OH1 strap?

[@markomarkovic1353]

can the Polar P10 be connected to the Garmin Fenix 6? Thanks

[@BMD8]

I'm looking for a HR sensor with memory to record surfing without a receiver nearby. I've tried the whoop 4.0 but for the price, the accuracy and limitations of the app, not to mention the cost, i'm returning it within the first 30 days. Ideally i'd like a chest strap because surfing can be a very peaky activity with long rest periods and then a frenzy of activity. The garmin chest straps would be great if they weren't slaved to a garmin watch and the bulk on the sternon is a big nono when leaning on a surfboard for paddling. anything you can recommend that's better than this polar arm strap? Thanks!

[@Thoma51987]

really cool

[@DixieGeezer]

I would like to get a heart monitor just to check my pulse with a 24-hour continuous database. Purpose: To show my doctor during a routine physical. I'm an active old man without a known heart issue.

[@alicksasylum]

Do your research and then buy any HR watch with 24 hr tracking.

[@nurikmen000]

Hi Rob 🙋🏻‍♂️

[@TheQuantifiedScientist]

Hi!

[@MrChatmoon]

Excellent

[@NicksStuff]

When you're working on your arms, why not put the sensor on a leg?

[@rmjormjo]

Polar lately made a firmware update to increase the battery life from around 20 hours to 30 hours without a change on the hardware. Is the Verity Sense a new hard ware developement at all? Or is it only a Polar OH1 with a modified firmware, which lowers the sampling rate to increase the battery life? This would decrease the accuracy. If so, it seems not affect the accuracy measurement which is presented in this video.

[@ranzigerkaefer]

Hi, do you think I can use it for my kcal-Intake-Recording throughout the whole day? I just want an accurate (without calculaters from the web) way to know how much calorys I have to eat for my bulk phase. Workout and resting, eating and sitting in front of notebook - an all-in-one recording is what I am looking for. Do you think it would work decently?

[@rainerrain9689]

Yes you can record an entire 24hrs of data.

[@nomoshiti]

Do you have any idea what Apple does right to beat dedicated optical HRM (it's not really different price category as polar is hrm only) or the most expensive Polar, Garmin watches? Is it just leds that they use that make the difference? Their configuration? Algorithm? Garmin Fenix is also in completely different price category, but it doesn't help :) Maybe Venu 2 will change something, but still... Apple is so accurate for many years and I don't think they produce leds used themselves.

[@B.B12]

Could you compare test Oximeter please

[@YhcTiR]

I have a 5 seconds lag between my thoracic belt and my Verity sense. It's very disappointing for me.

[@sdqsdq6274]

btw u didnt check does it work on the wrist? anyone tried ?

[@حجاجالعربى-و4ض]

What do you think of amazfit gts?

[@TranceMusic20]

I've got Polar Pacer Pro and H10. With H10 my gym training or running is showing a lot more effort like 10-20 more average heart rate which is huge in term of how was my workouts and recovery during the week by week. I need to know if the verity sensor is better than watch? If so by how much?

[@Horpetii]

Hello. Both H10 and Verity Sense is much better than the Polar watch (I have Vantage 3 for reference). I am not a scientist but mad some comparison and had obvious signs just looking the data. If you really care about your HR (and use the data for effort comparison, etc) use H10 but if Verity Sense gives more comfort for a trade off during resistance training (see it also in the video) it is even better than the watch alone.

[@sylvianbraibant7381]

Hi Rob, and everyone. Have you been thinking about testing the effect on your sleep of a grounding bed sheet? I watched The Grounded (kzbin.info/www/bejne/mYO6YYuFZ92KpJY) and decided to give it a try. I feel I sleep better, but I have no way to measure my sleep (hence my presence here) yet.

[@pak6198]

Can you test Garmin Venu 2

[@beybalaeliyev4672]

Can you test realme watch s?

[@RRR20238]

Have you tried Verity Sense and OH+ on the forearm?

[@TheQuantifiedScientist]

Hi RRR, no I haven't. This was for me the easiest place to test it, but it would be interesting indeed. Why do you prefer the forearm?💪🏼

[@Tirelirelou]

@@TheQuantifiedScientist I would think that the foream muscles are less sollicited, at least for weight lifting... Congratulations and thanks for your time and efforts doing these tests in a proper scientific way. Still searching for a reliable but less expensive watch for sleep tracking than the Apple Watch or the very smalll Fit 2.

[@RRR20238]

@@TheQuantifiedScientist kzbin.info/www/bejne/p4Cpia2dqcdmm6c

[@manojlogulic4234]

I have H10 my problem with this device is when I go to swimming and once I finish and sync with polar flow application my data is not complete, it show only summary of the training but don’t show heart rate over time data. I wonder is this same for OH1 and Verity Sense?

[@rainerrain9689]

Verity Sense will show heart overtime on their app chart.

[@manojlogulic4234]

@@rainerrain9689 Really? When Polar Flow aplication is out of range from device and once get close and sync training sesion it will show hearth rate overtime trough whole sesion?

[@rainerrain9689]

@@manojlogulic4234 Yes, you don't need to have the app on ,just turn on record on the polar Verity Sense strap ,then when you want to see the data turn on app and sync . It will show your heart rate on their chart in the app .I do it all the time. Remember ,the polar Verity Sense strap records your data even if the app is off or on and you don't even need to have your phone with you on a run or biking etc ,only when you want to sync data to polar flow app on phone. As soon as you hit record it monitors your heart overtime continuously until you stop it. I even wear it to sleep sometimes . Chart shows heart rate overtime. I do it all the time.