| HEARTRATE_DAILY_CALORIESOUTOFRANGE | Calories spent while heartrate was oustide a heartrate [zone](https://help.fitbit.com/articles/en_US/Help_article/1565.htm#) |
| HEARTRATE_DAILY_CALORIESFATBURN | Calories spent while heartrate was inside the fat burn [zone](https://help.fitbit.com/articles/en_US/Help_article/1565.htm#) |
| HEARTRATE_DAILY_CALORIESCARDIO | Calories spent while heartrate was inside the cardio [zone](https://help.fitbit.com/articles/en_US/Help_article/1565.htm#) |
| HEARTRATE_DAILY_CALORIESPEAK | Calories spent while heartrate was inside the peak [zone](https://help.fitbit.com/articles/en_US/Help_article/1565.htm#) |
| TIMESTAMP | An UNIX timestamp (13 digits) when a row of data was logged |
| LOCAL_DATE_TIME | Date time string with format `yyyy-mm-dd hh:mm:ss` |
| DEVICE_ID | A string that uniquely identifies a device |
| HEARTRATE | Intraday heartrate |
| HEARTRATE_ZONE | Heartrate [zone](https://help.fitbit.com/articles/en_US/Help_article/1565.htm#) that HEARTRATE belongs to. It is based on the heartrate zone ranges of each device |