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Heart rate accuracy as function of looseness/tightness on wrist

How important is the fit of the watch on the wrist for an accurate heart rate reading? I prefer a looser fit for a watch than most people I think, but I'm wondering about heart rate accuracy. Is a loose fit okay for that,

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fallingrock over 3 years ago +1 suggested

The HRM depends on contact with the skin so the LED light can be accurately measured, so the watch definitely needs to be snug.
rentagreement over 3 years ago in reply to fallingrock +1

Thanks - I am just wondering: I find snug worn watches very uncomfortable. What does snug mean - like really tight or a little loose, enough to stick the little finger between watch and arm?
If snug means…

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0 fallingrock over 3 years ago

The HRM depends on contact with the skin so the LED light can be accurately measured, so the watch definitely needs to be snug.

0 Garmin-Kevin over 3 years ago

Please see the FAQ below for more info:

The Heart Rate Sensor on My Garmin Watch Is Not Accurate

0 rentagreement over 3 years ago in reply to fallingrock

Thanks - I am just wondering: I find snug worn watches very uncomfortable. What does snug mean - like really tight or a little loose, enough to stick the little finger between watch and arm?
If snug means really tight, then I am probably out for any kind of wrist based fitness watch