accuracy HR during sleep

NickMN said:

you edited that while i was typ0ing it appears (i edited mine too)

This does not change the essence; a genetically determined heart rate of 36 bpm is not true.

The boldness with which you judge the “small difference of 4 bpm” raises a question in my mind about your competence. You are a doctor?

Nope, but I did stay at a Holiday Inn last night! :-D

No doubt genetics and fitness are likely not going to be 36bpm.... HOWEVER, it is not impossible, endurance athletes DO have resting HR < 40!  Just like all the alarmists how see someone have a HR above 180bpm-age!!! wow, heart attack city!!!   The amount of training books, studies, etc (especially as someone with heart concerns / stars / bloodpressure issues)... yes, I have learned a lot on the matter over the past years.  To say that my SIL & wife are the LOWEST RESTING HR IN THE WORLD FOR moderately trained individuals however is not true either!   lol smh

However in this case, using a watch with inherent error... coupled with lack of user data to review... who knows how they wear watch... margin of error could EASILY be that their bpm was really 40 at that moment... or it is completely junk data !!!   The amount of missing HR or HRV while sleeping is huge!  Read the forum!  

Daily fluctuations in resting HR are huge!!!!!   I see plenty of 40-43bpm in my graphs , some days never below 50!  If I saw a few sections in the 30-37bpm... I wouldn't miss a beat!  If I had concerns about things, family history, other symptoms, fatigue, shortness of breath, inability to hit paces/workouts/higher-HR... etc... sure as *** I would be concerned!    

OP:  What is your 3-6month average or trend for resting HR?  Is it consistent?  On a daily / weekly basis is it within 10%?  Has it changed recently?

As I understand it, you are not advising to see a doctor, but are advising to do something else?

I asked questions and provided additional feedback / annecodes .   Without that info I can't provide further advice.  Appears they are were healthy and had not issues.  So,  NO I am not a doctor and this is a tech/fitness forum, without vetting info or situation I am not recommending someone spend hundreds of dollars chasing possible fake issues. 

Especially when plenty already advised that without seeing info and relaying on a possible new watch users interpretation of data.

someone looking at a report on garmin and seeing a very low or high number.  deciding they an issue.  

could have been one day of bad data

could be numerous blips of low data but the rest of the data is higher over months... 

people often say their HR got to this or that on a run... go and look at it myself and you can clearly see no correlation at that point to pace/HR... where most of their runs or that activity you can see a correlation.  It was just optical HR cadence lock or other poor reading.

with such little information in their post or long term feedback, impossible to say.  beyond the fact they are doing athletic sports and mentioned no issues.

medical study... RHR of 38-35....  plus mention of dropping per year.
https://www.ahajournals.org/doi/10.1161/circoutcomes.6.suppl_1.A311  

So again... could also have a really low RHR  (especially if non-white and male!.... which my SIL/Wife are NOT/NOT... so -4bpm to their 42bpm!..... nor are they 58!)

In my opinion, you are avoiding the answer, do you mean hundreds of dollars for a visit to the doctor or what?

No, I am not.... the possible false , fake, or non-issue... is that it is bad / impossible to have a HR <= 40 as an active and healthy adult.  Come here and people tell you have a problem likely ... but don't stop to ask some basic questions about the data and how it was determined .   

Main other issue was HOW THEY FEEL!?  Bracardyia has symptoms , none of which were mentioned , no other health issues were mentioned in fact !    Only symptom was that they are being very active regularly!!!! (healthy)

So yes, people should (especially over 50-55 i think) go to the doctor and get regular checkups , mention health concerns , screen for cancers , etc    But for some people the hundreds of dollars (a car payment possibly or a months worth of food) might be a bit much, considering the data that was provided...

Harvard College " D. Bhatt "

Q. I've read that a normal resting heart rate is between 60 and 100 beats per minute. Mine runs around 45 to 48. Should I be concerned? I have been a runner for 42 years and have completed seven marathons.

A. Unless you feel tired, dizzy, or weak, there's usually no cause for concern, especially because it sounds like you're in good physical shape.

Endurance athletes and other people who exercise a great deal often have lower-than-average heart rates, sometimes even below 40 beats per minute. Exercise strengthens the heart muscle, enabling it to pump a greater volume of blood with each heartbeat. More oxygen gets delivered to the muscles, so the heart needs to beat fewer times than it would in a less-fit person while at rest.

In general, a slower resting heart rate is better than a fast one. A high resting heart rate has been linked to atherosclerosis, sudden death, and an increased risk of dying from cardiovascular disease. In people who are not physically active, a resting heart rate below 60 is sometimes a sign of an electrical problem with the heart, a low thyroid level (hypothyroidism), or damage from a heart attack or heart disease." 

NickMN said:

Main other issue was HOW THEY FEEL!?  Bracardyia has symptoms , none of which were mentioned , no other health issues were mentioned in fact !    Only symptom was that they are being very active regularly!!!! (healthy)

The difference between us is that I have bradycardia, I know how it is detected first-hand and not from the Internet. My baby talk at the cardiologist’s appointment that apparently I’m just very healthy, that’s why I have a low pulse - that was also the case. A holter is placed for a day - the full picture immediately becomes clear, right down to atrial fibrillation. I wouldn't recommend risking your health.