Game of Thrones tends to make your pulse quicken — but now we know exactly which moments in the show are the most thrilling. Spoiler alert: nearly all of them are about character interactions, not big battle scenes.

The Apple Watch app Cardiogram, which has previously been able to warn users about early signs of heart disease, has turned its attention to HBO’s most popular show in a bid to discover what it does to our heart rate.

SEE ALSO: Why you should be concerned that Dany is going mad with power on ‘Game of Thrones’

Cardiogram got 300 users to sign up for a “What Game of Thrones does to your heart rate” habit, which reminds them to start recording their heart rate every 5 seconds (the Apple Watch default is every 5 minutes) at 8:45pm on Sundays. From those 300 brave guinea pigs, it gathered a total of 2.3 million heart rate measurements. …

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