How does Garmin determine active calories?

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Tags

1. #total
2. #burned
3. #weight
4. #activity
5. #resting
6. #level
7. #heart
8. #garmin
9. #device
10. #record
11. #calories
12. #active
13. #height
14. #based
15. #adding
16. #using
17. #gender
18. #available
19. #calculate