Everything is wrong with my 935

my bet is your max heart rate has been altered somehow. Check the setting on Garmin Connect, GC Mobile and the watch and check they all match and are all correct.

CW

I did. They all read 179, which was the max heart rate the watch found.

What are your heart rate readings for these activities are they roughly what you would expect. Recently I have had the opposite problem because my hrm was reading way too high for part of a run it's been pushing my vo2 max down.

I also thought about it, though the hrm readings seem normal. I'll go without the hrm tomorrow, even though the watch hr sensor isn't that reliable, and see what happens.

Chest strap or wrist HR?

You cannot expect stable, accurate, or sensible readings from the wrist HR. You need a strap.

I know that wrist hr isn't reliable, I just thought to give it a try and see the readings after the workout. At least, at first, when I bought the watch and was not wearing a chest strap, I never had 1.0 reading in aerobic training effect no matter how easy the workout was. Today I have interval training so it's a given that there will be a high aerobic and some anaerobic training effect.

Chest strap or wrist HR?

You cannot expect stable, accurate, or sensible readings from the wrist HR. You need a strap.

I keep seeing you post this Phil, and it's clearly your experience. But there are many of us that have no problem with the wrist HR and get perfectly sensible readings (max HR, VO2max, etc etc). On the contrary, i always had serious problems with the chest strap. It wasn't until i moved to the optical that i finally got consistently stable numbers that i could rely on.

Just saying don't be so absolute with your statements.

Solved! Chunkywizard at post #2 was right. The general maxHR was 179 as I mentioned, but the run specific maxHR somehow went to 243 ! I hadn't noticed this. After deleting this, all went back to normal. After today's workout I have normal readings at lactate threshold, training load, vo2 max, performance condition and training effect.

:-)

I keep seeing you post this Phil, and it's clearly your experience. But there are many of us that have no problem with the wrist HR and get perfectly sensible readings (max HR, VO2max, etc etc). On the contrary, i always had serious problems with the chest strap. It wasn't until i moved to the optical that i finally got consistently stable numbers that i could rely on.

Just saying don't be so absolute with your statements.

There are plenty of write-ups about the inconsistencies of the Optical Heart Rate Monitors example:

https://valencell.com/blog/2015/10/o...-need-to-know/
https://valencell.com/blog/2017/01/t...nitor-watches/

Valencell is one of the biggest if not the biggest in the OHRM sector and even then they admit WOHRM are not consistent, but consistently underperform vs. a chest strap.

Junk numbers go in junk numbers come out. Let me stress that Wrist-Based OHRM are the issue here. Everything from the fit on the skin (too tight, too loose) Muscle flexion etc... cause it to vary wildly. I've personally seen 80-100 bpm differences between the Wrist ohrm and a chest strap. With new Bicep/Upper forearm OHRM out (like The Tickr fit) you'll get much closer results to a chest strap. Still even then HRV is not recorded with OHRMs and there are other factors to deal with (OHRM do not place well with dark skin for example).

Phil isn't wrong, Phil is curmudgeonly sure and doesn't always take the time to explain things (and in this case I agree with for not doing so), but it's been said ad-nauseam and analyzed over and over here and in professional tests. Garmin's Elevate isn't even one of the good wrist OHRM. At most it's fine for passive things like RHR, Beyond that is performs poorly. He's not alone, and i'd put you to task and do a workout using both the OHRM on the watch and wear a chest strap.

Auxiliary Heart Rate CIQ app. It lets you record both a chest strap and the elevate HR during an exercise. https://apps.garmin.com/en-US/apps/8...7-3e15ca00185f