Fenix 6 Series - 17.74 Public Beta

Well the graph does actually make sense looking at the stress readings, point is... Do the stress readings make sense? Looking at them my interpretation is that since midnight (0.00) of July 10 you did not sleep, and actually around 4am took a nice walk... If that is real... Low battery seems reasonable 

Then... That is an algorithm, must be based on some calculation "rules", one of wich seems to be "minimum value is 5", then going up seems governed by the stress measurement (and only goes up if it is below a certain threshold), so...

For instance, i sleep very few hours, my BB never gets to good high values in the morning, and during day drops following stress measurements, plus faster drops during activities... Usually i burn it all and i am flat at 5% already at mid afternoon.

But up to now this didn't cause me to drop dead

Sounds like you need to adjust you max puls - has huge impract on stress function

Hi thanks! This is actually really interesting... Now i think it is set to 180, I am 43, not exceptionally fit, i see sometimes during some sprints - and I do try to avoid really excessive effort - reads up to 185 o Little more... Should I increase the max pulse to around this value? Or would it work better lowering it to the "standard" 177?

I really have no idea how the algorithm would react to the change in either directions, always thought was based on variability only, indipendent from the set max pulse.....

Thanks again!

YOUR max should be YOUR max. There is no "standard" for max heart rate any more than there is a standard for human height or shoe size. 

I'm 58 and can push over 190 if I care to dig deep. Just last week I reached 193 without burying myself and throwing up. Obviously this is with a chest strap (HRM-PRO), for accuracy. My max is set to 195.

Forget equations! If you can reach 185 without too much effort then your maxHR is a quite a bit higher than that. and your watch needs to be adjusted accordingly as otherwise lots of things get messed up, like stress readings, like calorie burns (expect lower numbers once you adjust it), and lots of other things.

HR max should decrease every two weeks by 1 beat until you reach this value again!

And it is better not to believe in single values, but to choose the maximum average for 3-5 seconds.

Well you are right, in fact, I meant what it is usually advised as a "good estimate", the famous "220-age", but... Again what you say makes a lot of sense, now that i think about it... Also my training load focus always tells me I excercise too hard, while I don't think so... But of course it has probably thresholds lower than what should be, and it thinks I am overdoing already at 130 BPM Makes sense.

Thanks again, very interesting discussion!

Here are some peak average heart rate stats over time from that treadmill session above....

So, yes, my peak was 193, but I was at 190 average for a full minute and (not shown here) 190 or higher for 30 seconds. And I wasn't trying to force a max heart rate value, just pushing hard on the final interval.

At 58 the 220-age formula would suggest my max to be 162. Well obviously that is poppycock! :-)

I'm 53 and I can push it to 200 when I sprint during a run (wait to like 10 minutes into a run and then just run all out, walk for a few minutes, repeat a few time, see what max puls is for that run). Seems to give a fairly accurate picture of my stress levels, with max puls set to 200 for me