Location of the most detailed HR data from Activities

[smros]

I want to sort and slice the HR data from activities in a few different ways without necessarily adjusting the HR zones yet.

In Monitoring_hr database, during an activity, I see a point per minute. I presume this is the average HR over that minute. The plot you can see on the phone app seems like there is higher detail, but it hard to tell for sure. Is there a source of finer-grain HR data, or are the 1 minute points the best?

Thanks,

-Steve