HRV

EzioAuditore

@aslysz if not medically approved device (none of the sports watches are) than we should not look for the reason I guess. It may be a lot of reasons. I.e: I see more light bleeding of the sensor on suunto than on the Ultra even though the Ultra is more loose, wearing it on left hand vs right hand also causes differences.
What I’ve always been able to correlate is the trend. If I am sick or too tired or beer it goes down. Much rested it goes up.
Now is my pre race week where I rest more and recover and the hrv is above my normal values

A Former User

@EzioAuditore that’s how I’ve been using it.

Paying attention to the trends, run down, travel/ stress etc.

For example march was a combination of work travel, being sick and an injury. Trends picked it up. Now that the weather is better I’m doing longer exercises, eating cleaner and (what I find most important) staying hydrated.

MKPotts

@aslysz
I don’t know why they match for me, I’d be speculating. It’s the opposite when exercising, all wrist sensors are bad for me but Suunto ones in particular.
Like the others, I just look at trends in HRV. For this, I find the scatter plot that Garmin uses better for seeing trends than the way Suunto presents it.
More generally than this, I find resting heart rate a better indication of recovery, impending illness etc than HRV and all watches I’ve had with wrist sensors measure that accurately.

aslysz

Ok!
Maybe you’re right, trends count.

The question remains why Suuntos do not measure HRV so often (despite the correct settings - often does not measure for weeks to measure 3 days in a row) - it is difficult for me to say whether it is a software defect or hardware failure?

Maybe someone knows better?

A Former User

@aslysz just so I understand, you don’t get an HRV value every time your sync after waking up? For me I’ll get a measurement and value every time as well as blood oxygen (24/7 HR and blood oxygen are turned on)

Example from last night

It could be hardware or the way you watch is sitting on your wrist while your sleep. If you are not wearing it above your wrist bone (2 cm above your wrist) and snug you may want to try that to see is it helps.

Sportsfreund

@mr-quality said in HRV:

@cjanevate said in HRV:

@szaboat74 Overnight HRV measurements for me are not optimal for many reasons, so I don’t trust these values at all (whatever the brand, of course).

A parallel comparison with Garmin and Polar shows that the measurement of Suunto is wrong. The sensors of Suunto seems to be outdated.

Mir zeigt meine Vertical auch ganz andere Werte an als mein Suunto Gurt per HRV App sowie eine medizinische Messung.

Meine Vertical zeigt ca die Hälfte des Wertes den meine Suunto Gurt und der Arzt misst.

Stefan Kersting

I have a SV1 and noticed a thing concerning HRV. The last weeks I slept not that good and less hours than usually. I noticed that the shorter the night the higher the HRV (about 80 with 5 hours of sleep). When sleeping about 7,5 hours it is ca. 60 even if I feel me good after 7-8 hours sleeping. Is there a correlation?

runyx17

@Stefan-Kersting Yes, I noticed that on my SV2 too. The shorter the sleep, the higher the HRV. Strange.

Stefan Kersting

@runyx17 so I am not alone. weird… Should think that enough sleep is positive for the HRV

pilleus

@runyx17
Other brands use only the first 4 hours of the sleep to determine the hrv. May be to compare always the identical time of sleep?

elbee

The models of garmin that are testen in a scientific way (not by some sport gadget blogger) shows that hrv isn’t that accurate on those models. (See https://the5krunner.com/2026/05/05/forerunner-265-hrv-study/ , links to sources on that page)

I have no reason to believe other models or other brands are more accurate.