Watch showing low heart rate of 40 to 52 any one else having the same problem

I had this issue at the gym a few nights ago.. It was fine during my cardio work-out but the watch moved out of its normal position when I switched to weights and only showed 52bpm. Once I dried the sweat off my arm (back of watch) and moved the watch back to a "snug" position, it was fine.

When I have my watch on with a snug fit, I don't typically have problems... and I sweat a lot during my work-outs.

If you read the user guide carefully, it turns out there are actually two ways in which Apple Watch can measure heart rate: via infrared sensors (usually used for the periodic background measurements while you're wearing the watch but not in a training) and via the green LEDs emitting visible light (only used during training or when you open the heart rate check).

When you go to the heart rate check (swipe up on the watch face, then right or left until you see the heart rate), it should display two values:

One reads, for example, "70 bpm, 5 minutes ago" - this is the background value taken via the infrared sensors and therefore potentially less accurate.

The other is shown after some time in big font (and you may notice that the watch switches on the green LEDs at this point to take a more precise measurement). Is that value also low for you?

I have the same problem. But I only notice it when I check my HR dashboard in the Health app, not when I check from the watch through a glance. I've had a few other issues also.....

If I don't use the "exercise" app but I am working out at a high intensity, for example on a Stairmill, my HR calculation is extremely inaccurate (very low). Even if I do use the "exercise" app and I'm running the stairs, the HR calculation is low and takes a while to catch up.

My HR data isn't always posted to the Health app in 10 minute increments.

Any advice?

Thanks.

when checking your heart rate, make sure the sensors have a good clean surface, make sure the watch back is clean, and your wrist is not wet or sweating, check the band and make sure it is not loose, it could be a number of environmental things interfering.

Yes, I found that when my wrist is wet from sweat it reads 1/2 the true value.

You can't be serious! A hear rate monitor is near useless if it doesn't work when you are sweating. What's the point of measuring your heart rate when you are watching TV, you can do that manually in a few seconds. If sweat stops the HRM from working then its useless for exercise.

I sweat heavily and this doesn't happen on my Watch.

I have somewhat the same problem except it shows very high heart rate when it is not snug on my wrist during workouts. If the watch is loose and hanging loosely around the bony part of my wrist I get about 170 BPM consistently. When I move it back up towards my forearm and make sure it is snug, it goes back to normal.

Really? how do you exercise w/o sweating?

That is going to be dependent on how much true contact the sensors are getting to your wrist. Your band may be too loose. Or it could be too many anti anxiety meds.

I have the exact opposite issue. The heart rate monitor is usually high for me.

First have sometime tale your pulse, if you do not have anyone, Most drug stores have the blood pressure monitors, that will give you your pulse. then compare to what apple watch is giving you