Vp60 Heart Rate Sensor

[Deb Cartelli]

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Background: Wearable fitness trackers are devices that can record and enhance physical activity among users. Recently, photoplethysmography (PPG) devices that use optical heart rate sensors to detect heart rate in real time have become popular and help in monitoring and controlling exercise intensity. Although the benefits of using optical heart rate monitors have been highlighted through studies, the accuracy of the readouts these commercial devices generate has not been widely assessed for different age groups, especially for the East Asian population with Fitzpatrick skin type III or IV.

Methods: A total of 20 young adults and 20 older adults were recruited for this study. All participants were asked to undergo a series of sedentary and moderate physical activities using indoor aerobic exercise equipment. In this study, the Polar H7 chest-strapped heart rate monitor was used as the criterion measure in 2 fitness trackers, namely Xiaomi Mi Band 2 and Garmin Vivosmart HR+. The real-time, second-by-second heart rate data obtained from both devices were recorded using the broadcast heart rate mode. To critically analyze the results, multiple statistical parameters including the mean absolute percentage error (MAPE), Lin concordance correlation coefficient (CCC), intraclass correlation coefficient, the Pearson product moment correlation coefficient, and the Bland-Altman coefficient were determined to examine the performances of the devices.

Conclusions: The study reveals that commonly used optical heart rate sensors, such as the ones used herein, generally produce accurate heart rate readings irrespective of the age of the user. However, users should avoid relying entirely on these readings to indicate exercise intensities, as these devices have a tendency to produce erroneous, extreme readings, which might misinterpret the real-time exercise intensity. Future studies should therefore emphasize the occurrence rate of such errors, as this will likely benefit the development of improved models of heart rate sensors.

But I also used a COROS APEX 2 Pro watch as a comparison point, a Garmin Forerunner 955, and a Garmin chest strap (HRM-PRO Plus). In other words, plenty of competitive options here to see how things handled. And, I got my wife involved too with her running interval workouts.

(Note: All of the charts in these accuracy portions were created using the DCR Analyzer tool. It allows you to compare power meters/trainers, heart rate, cadence, speed/pace, running power, GPS tracks and plenty more. You can use it as well for your own gadget comparisons, more details here.)

It looks to me like there is some signal issue when pairing the COROS HR Monitor with a non-COROS watch so I would love to see if your further testing confirms this issue. Not sure why there is such a difference compared to pairing to a COROS watch.

Dear Ray, I noted that when out its cold, near 10C the strap doesnt works good, not only on intervals of one minute but even on long runs, i see various spikes in the graph, even if i wear longsleeve shirt. Did you notice it?

Once the armband is added in the Coros app, on my Garmin Forerunner I had to go into Settings > Sensors & Accesories > Add new. Now I just throw it on my arm before my run and my watch automatically connects to it.

Hey thanks for coming back with a reply.

I have paired it with the COROS phone app, but it registers no activity. I paired it with Strava and the pairing worked, but I wonder if i have to start the activity on Strava itself on my phone to make it work rather than what I have been doing which is letting it link to my Garmin then starting my activity from Garmin. I hope that makes sense?

Thank you Ray for the review! Quick question: when paired with a Garmin, how can you see that the HR recording was indeed made with the Coros? Reason I am asking is that I do not find any hint in the activity details; in contrast to some recent Garmin products like the HR Pro, it is also not shown in the device section of the activity. Best, Marcel

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So I then went and used my phone. I propped it up on some gloves on a bike saddle, and then used the nifty distance markers on a bike path near me. The sensor would have line of sight straight to the phone the entire time.

Ok, so in my testing, I simply use the strap throughout my usual workouts. Those workouts include a wide variety of intensities and conditions, making them great for accuracy testing. I have a blend of interval and steady-state workouts on both running and cycling in here, both indoors and outdoors.

In fact, if we then move to the 30-second sprints at the end, which are usually quite difficult for optical HR sensors in the cold, almost all of the units did well (minus Whoop, which was 10bpm low). We see some squiggles from the FR745 on the 3rd and 4th intervals again however, the others were fine entirely.

(Note: All of the charts in these accuracy portions were created using the DCR Analyzer tool. It allows you to compare power meters/trainers, heart rate, cadence, speed/pace, GPS tracks and plenty more. You can use it as well for your own gadget comparisons, more details here.)

I thought Elite said the device does not provide sufficiently granular signal data to infer HRV. As I understand it, this is a limitation of optical HR monitors in general, not the OH1 series in particular.

Use Kubios HRV =com.kubioshrvapp

Since the app is built with Polar mobile SDK, it can read live data from Polar sensors, including electrocardiogram (ECG) and heart beat interval (RR) data from Polar H10 sensors and live photoplethysmogram (PPG) and inter-pulse interval (PPI) data from optical Polar OH1 sensors. Thus, when used together with Polar H10 or OH1 sensor, the custom measurement mode will provide an easy-to-use, light-weight, affordable way to obtain ECG, PPG and RR/PPI recordings.

Will the strap be available for purchase separately?

I use the existing one on my FORM goggles for swimming and under my wetsuit for surfing; strap uncomfortable when laying on the board paddling and wrist HR from my Fenix6 would mean putting under my wetsuit in winter meaning no temperature reading and ability to tell the time etc.

To link data with the standalone function of the Polar Verity Sense and OH1 I use link to fitfilerepairtool.info This is a super handy tool, and use it particularly to link data from my Assault Airbike, but can be done with any file or device actually. Super handy

I have noticed different OH1 battery life depending on the settings available in the Polar Beat app. If I turn off ANT+ and visibility to other devices I can get close to 8 hours if HR is broadcasting to my M460 or M400 and not recording internally. I have had the device go flat once when not in use and this was with the previously mentioned settings all turned on. So I leave the ANT+ and visibility set to off unless required.

My only issue with my OH1 is the occational flipping over issue when playing basket ball.

So basically I could just purchase the Verity Sense strap (if available separately) and use it with the OH1.

Goggles strap makes me wonder where else it could work. If it turned out that the sensor gets a reasonably reliable signal from a thigh it might be sufficient to just drop it in your bib (no, not there, off center!), resulting in instant comfort victory over any startup/belt ever used for HRM.

Haha, no not with the laptop. But there are bound to be hiking boots in there and other not quite so soft and fluffy stuff. Or it ends up in hold luggage and the luggage handlers do very unpleasant things with my only one side hard-ish suitcase.

Given how many ANT capable straps (chest or optical) have some method of storage on the unit (e.g. a few Polar units, I think a couple Wahoo ones, etc.) why do you think no one other than Garmin has implimented ANTft on their straps?

Probably mixed results, depending on how protected it is from the whack. Meaning, wearing it on on the outside/upper side of the arm will likely do better than the underside (since that hits the water first).

In order to get reliable real-time connectivity between a Suunto Spartan Sport Wrist HR and a Polar OH1+ during my swims I cannot wear the OH1+ on a goggle strap.

Instead I wear it on the inside of my upper arm on my bicep, on the same arm as the Suunto watch, with the strap fairly tight.

During both pool and open water swimming this has given me successful results for freestyle swimming, and I am able to monitor my heart rate on my watch during the swim. The Bluetooth connectivity is reliable and I never see gaps in the heart rate data.

Yes. I can confirm that when using the Polar heart rate sensors with Garmin łor any other brands like Suunto, Zwift, Concept2 etc) and also enabling the internal recording on the heart rate sensor, then the heart rate sensor will sync to Polar Flow and the watch to Garmin Connect.

Looking at the Polar website info about their SDK, it also shows the OH1 as having acceleration data available. Is anyone aware of any apps that use this? Also suggests it could be possible to include the swimming metrics through a firmware update.

It may be not directly related to this product but within the same family. Have you ever tested or any interest in the oura ring? I am curious how does that compare to Fenix 6 or FR945 in terms of sleep data, HRV and body temperature.

Hi Ray,

in the video you showed that the pod sits very close to the electronics part of Forma goggles. Does it mean that the goggles will be able to receive the transmitted HR even underwater thus giving real-time HR or is it still not close enough?

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