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Hi, a few months ago I got an Apple Watch. I run pretty regularly and used to use a Garmin heart rate monitor. When snug on my wrist, the Apple Watch heart rate data seems comparable to the Garmin HRM if not more accurate. Recently, my mom was admitted to the ER for an atrial flutter. She was asking me about the Apple Watch heart rate data, so I went back and took a closer look at my own.

Recently I've noticed a heart rate spike while I'm asleep, often around 3 or 4 a.m. I wanted to be sure this wasn't a fluke, so I made sure my Watch was firmly snug on my wrist last night and fully charged. Looking at my data this morning, my heart rate was between 112-114 consistantly between 3:45 and 5 am (readings are taken every few minutes). It dropped to 48 after for a few minutes. The rest of the night my heart rate was around 60. My usual resting heart rate is anywhere between 55-72. Is it normal for such a high HR spike when I'm asleep and not active?


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replied December 10th, 2016
General Q and A Answer A59750
Hello and welcome
Your concern is appreciated
This can be simple sinus tachycardia or sick sinua syndrome but it can only be cleared with ECG. Multiple episodes of tachycardia with signs and symptoms of light headedness warrant investigation. 24 hrs holter monitering can also be done to document your rate and ryhtm.


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