How accurate is Apple Watch heart rate?

24F: So is my Apple Watch being dramatic or should I be concerned? The past 3 days now l've been tracking my heart rate because whenever I stand or walk my heart rate shoots up to around 120bpm. Throughout the day I could be walking and it could go from 154bpm-170bpm and yesterday it went up as high as 186bpm. I get super light headed and winded while walking and I literally walk EVERY DAY; it's not abnormal for me to walk so I don't understand this new weird trend in my heart rate. I check it against an oxygen monitor from Amazon with good reviews and it shows the same bpm so l'm not sure what's going on and l'm not sure how accurate Apple Watch is so I didn't want to freak out until it's warranted. But if that's my trent in heart rate standing and walking is that normal? 1| Share