Tighten GRRR!
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‘’’
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Really liking the reviews on Helio Strap and Ring combo. Cheaper than 1 years Whoop membership for both and no subscription. Time to cut my losses I think, doubt this will stay posted for long but Whoop deserves this for their total abandonment of their customers. “Our team thinks it’s loose and you need to turn it into a torniquet” 
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AlanG, thanks for all your input into this thread - it’s been very helpful! I’m a 68 year old avid cyclist (100+ miles per week) and have been using a number of different chest straps over the years to monitor my heart rate. I have found their measurements to be very comparable so I assume they are accurate. My average heart rate for most rides is in the 120bpm range with my max being around 150bpm and that’s climbing 10-15% grades. My Whoops (4.0 & 5.0) have both reported 10-15% higher heart rate - 130bpm average and a max of 180bpm, the later being very unrealistic. I wear the band on my wrist about an inch above my wrist bone. I can try wearing it higher on my arm per your recommendation or getting a bicep band, but I’m not crazy about the idea of having to move the Whoop from my wrist band to my bicep band every time I go out for a ride. My preference would be to have the Whoop use my chest strap whenever it can ‘see’ it via Bluetooth.
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I am not sure any location fixes the issues to be honest. I thought I found the spot switching to Bicep but even that will just crash from one day to the next. I was pleased that the ECG/EKG and the BP insights seemed to work on the Bicep but the overall results seem spotting. I have just moved from right Bicep to left today but this is the last straw. So many problems and all we get is the device is loose, tighten. Any tighter and I will probably mess with my circulation.
The gold standard is the chest strap and I would accept some differences between wrist and bicep but I have maxed out at 207, which I am pretty sure I am not capable of at my age. I have seen my Garmin show max 138 but whoop 190/200’s. I have no experience of Whoop 4 but hear even those users say 5 is pitiful compared to it. My personal preference is to allow us to import HR for activities from Garmin/Strava etc that used a Cheat Strap. And while they are at it import Power, Distance, Cadence, GPS, Pace & Stride(runners) to give a much better picture of the effort than just HR and Time.
As I stated moving to the bicep seemed to work well at first and you might want to give it a go. Complain to Whoop and they will send you a free bicep band, at least they did with me. I do not moved the bands, it is now permanently on my bicep. It could be a hardware issue but fingers crossed it’s software that will be fixed with an update.
Here is my experience of Bicep.
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Whoop 4 was not that bad. But research in different forums told me that heart rate has always been a problem. Apparently the worst is Whoop 5/MG.
I go with the chest strap now. Next week Polar will launch a device that can be similar. Helio Strap I also heard good things.
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Or just with the Helio Strap on bicep 
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what sensivity? i have problems with connectionb and my data is always lost during the day
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I’m just here to share my frustration as a new user; I did a hard VO2 max cycling workout yesterday and Whoop had me at ~90 bpm for the first half, so my strain was way off. I really don’t want to mess with the position of the band—if I put it on my wrist, it sometimes works well and sometimes it doesn’t; if I put it on my bicep, it’s a little more accurate but then my steps are off. This should Just Work, but it doesn’t, so please just let me pair my external HRM to Whoop, or at least bring in the accurate HR data when importing an activity from Apple Health.
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Here is a typical example: run with low intensity and a few increases towards the end. At the beginning always these heart rate outliers. Admittedly in this example very extreme. WHOOP, I hope you get this under control.
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Same thing I get. Or sometimes even worse that my entire run shows an average heart rate of 180
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I am currently a user of a whoop 4.0, should I keep this version then and do not upgrade to the 5.0?
I have got a replacement sensor these days, placed it again on my bicep right arm, but still its a kind same.
Here for example a VERY challenging session from today morning for legs, shoulders and ABS:
I dont have my Helio strap anymore, but I know, when i do legs (what is normally easier to track for optical sensors, than upper body) my HR is somewhere around 120 and 130 bpms shortly direct after a set. When i do shoulder raises its at least 120 and ABS around 110. But here you cant see that effort, so it leads just to 53 calories and strain around 3 
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I’m also on a replacement sensor since mid August. Still (and worse) same problems. Bicep band doesn’t help. It’s like they send everyone a replacement sensor without admitting it’s the software/algorithm and not the sensor 
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I think its the hardware, what its not capable to read that fast HR changes. For stuff like treadmill its working fine for me, but especially for lifting, nope. I know my old Garmin Venu 3 (elevate gen 5 sensor) on my wrist was able to get all that peaks. But i dont have it anymore. And unfortunately sent the Helio strap back 
I will try tomorrow lifting with my old Instinct 2s solar with the older elevate gen 4 sensor. Lets see, i wll report back tomorrow.
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I am currently a user of a whoop 4.0, should I keep this version then and do not upgrade to the 5.0?
I too am finding the Whoop 5.0 heart rate really inaccurate during exercise ( I tried wearing it in different positions too)
I’ve previously tested my polar chest strap against a clinical cardio ECG monitor and know it’s relatively accurate (within 1% during a cycle ride)
The whoop was out by 40 at peak today and also is giving low HRV readings (30% lower)
The app seems really good, but if the data it’s given is so far out it really makes it meaningless
This seems to be a common complaint, can you offer additional information
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My Whoop 5.0 was 40 beats high at peak today, I’ve no experience with the 4.0 version
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I’m seeing similar, makes the analysis meaningless 
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I did a couple of tests this weekend. On Saturday, I did a two-hour sweet spot workout in Zwift, using a Garmin HRM 600 heart rate band. I downloaded the FIT file from Zwift for the activity, and exported the Apple Health activity saved by Whoop as a FIT file using the HealthFit app. I uploaded both FIT files to DC Rainmaker’s FIT file analyzer. The result was… not great:
That workout ended up with a strain of 10.2, which seems very low for the effort, but not surprising since the HR is detected was much lower.
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