No VFC data

Brad_Olwin

@luke55 what is VFC?

herlas

@Brad_Olwin Spanish for HRV

Matúš

@luke55, do you fit correctly the watch? During the night, is the watch able to “freely” move above your wrist?

luke55

@Matúš

Hi,

No, usually the watch is not able to move around my wrist, could it be a problem ?

sartoric

@luke55
it would be a problem the opposite

Matúš

@luke55, as said by @sartoric, it could be a problem if the watch is able to move/rotate around your arm/wrist, since it has to be fitted tight enough to obtain a correct measurement.

To me, it sounds strange that you have multiple discontinuous measurement: this could mean that sometimes there are good conditions for the HR measurement, and sometimes not, i.e., some condition change during the overall measurement.

You could read this Suunto article https://www.suunto.com/Content-pages/what-should-you-know-about-wrist-heart-rate2/ to check if you are doing something “wrong”.

luke55

@sartoric

I read this article, I really don’t see what I could be doing wrong when sleeping. The way I am wearing the watch looks OK, not to tight and not to loose.

On the other hand, I am very sceptical about the result of sleep tracking, sometimes the watch says I am sleeping when I am sure I am not, and sometimes this is the opposite !
Not sure if this could be related to the lack of VFC data ?

Below what the apps says on VFC, as you can see, not much.
By the way, Is VFC measured during night, or do I need to wear the watch during the day as well ?

Matúš

@luke55 said in No VFC data:

On the other hand, I am very sceptical about the result of sleep tracking, sometimes the watch says I am sleeping when I am sure I am not, and sometimes this is the opposite !
Not sure if this could be related to the lack of VFC data ?

By the way, Is VFC measured during night, or do I need to wear the watch during the day as well ?

If you wear your watch during the night, you can get data on your heart rate, HRV (VFC) and blood oxygen level while sleeping: thus, the HRV(VFC) is one of the output of the sleeping analysis, not the input.

luke55

@Matúš

I understand.
What I wanted to say is that maybe the erroneous results I have for sleep tracking and the lack of VFC results could have a common cause, which is the unability of the watch to correctly measure my heartrate.

But I read somewhere on this forum that sleep tracking does not use heartrate, so … ??

Matúš

@luke55, the Race tracks your sleep based on accelerometer data and, for example, on the contrary of the 9PP, you do not even need to set an average time for going to bed and waking up. When in evening you go to bed and stop moving around, the watch should start the sleep tracking, and so on with the HR trend and the HRV data. In the morning, when you wake up and start walking, again, the watch should stop the sleep tracking.

Thus, the accelerometer measurements define if you are sleeping or not, then, the HR measurements define everything else.

What about the HR tracking during the daylight, is it correct?

luke55

@Matúš

Usually, I don’t wear the watch during the day, except when I start an activity of course
Maybe this is the cause of the lack of VFC data ?
I will keep it during the day and see what happens.

I don’t understand why it frequently happens that the watch says I start sleeping 2h after I go to bed and turn off the light, it happens this night and I am sure I felt asleep quite rapidly
You say that sleep tracking starts and stops based on movement , but how is made the distinction between the different sleep phases, I assume heartrate is used ?

Matúš

@luke55 said in No VFC data:

@Matúš

Usually, I don’t wear the watch during the day, except when I start an activity of course
Maybe this is the cause of the lack of VFC data ?
I will keep it during the day and see what happens.

Let’s give it a try! It sounds reasonable that the watch needs to “learn” your daily average behaviour in order to work properly in terms of sleep tracking, available resources, etc…

I don’t understand why it frequently happens that the watch says I start sleeping 2h after I go to bed and turn off the light, it happens this night and I am sure I felt asleep quite rapidly

Maybe it’s because of what I’ve written above so, if you wear your watch exactly when you go to bed, it does not “understand” what is really going on.

You say that sleep tracking starts and stops based on movement , but how is made the distinction between the different sleep phases, I assume heartrate is used ?

Exactly, the HR measurement must be on and working properly.

luke55

@Matúš

I kept the watch all the day long Tuesday and wednesday.
I got a daily value for Tuesday …, but nothing for wednesday.
For wednesday, the only difference was that I did an activity from 10h to 17h, I don’t understand why this could prevent VFC tracking ??
Sleep tracking was as usual, not really accurate.

Sebastian Wagner 0

hi, i have 6 weeks of great sleep and hrv tracking. now out of the blue i have no hrv tracking the last two nights.
sleep tracking is normal, but no hrv. it started after the last time i loaded the battery.
hrv is enabled. so i have no clue why there is no hrv the last to nights. today i powerd the race off and on and hope i get hrv the next night.

luke55

@Sebastian-Wagner-0
Hi,

You are lucky, over the past 50 days, Hrv tracking worked … 5 times.
The rest of the time, when I wake up, the watch says : no HRV data.
Sleep tracking seems to work correctly, well, at least it gives results.
I already reinitialized the watch, no effect

I contacted Suunto support, no news over the past week.

Matúš

@luke55, what do you mean with “daily value” for Tuesday/Wednesday? HRV data are evaluated only during the night, thus, taking in account one day, the HRV data are always referred to the night before.

Yesterday morning, so Wednesday, you should have got the HRV data from the night between Tuesday and Wednesday; this morning, you should have got the HRV data referred to the last night, so between Wednesday and Thursday.

inkognito

@luke55 Could you perhaps try to let someone else wear your watch for a night or two? From the chart you posted it looks that your measured HRV was quite low. Perhaps the algorithm struggles with very low values…

luke55

@Matúš
What I mean is:
Tuesday morning, I got a value for the past night, 18ms.
Wednesday, and Thursday as well, I got no value at all, exactly like almost every day since I am wearing the watch.
Look at the screen dump I posted above.
Over 60 days, I got only 5 values, approximately between 12 and 36ms, full stop.
If the watch is able to detect and measure my heartrate, it should be able to measure this HRV as well !

I will ask my wife to take it for the night, and see.

Matúš

@luke55 said in No VFC data:

Over 60 days, I got only 5 values, approximately between 12 and 36ms, full stop.

S9PP here and I have HRV values normally around 30/35 (ok, slightly higher than yours, but anyway pretty low…): I do not know if 9PP and Race HRV algorithm or the “minimum thresholds” are different, but for me it works.

If the watch is able to detect and measure my heartrate, it should be able to measure this HRV as well !

During the daytime, does the HR measurement work properly?

I will ask my wife to take it for the night, and see.

luke55

@Matúš

Last night, my wife got a value, I will repeat the test to make sure it was not by luck.