Definition of level and METs of fitbit Charge HR

[jeeyi345]

Hi,

I'm using fitbit Charge HR, and the METs I got are always very high, the minimum is 9, and the highest and up to more than 100.
From my understanding of METs calcuation we have to do very hard exercise to get METs higher than 6, is there something wrong about my understanding of fitbit's value?

I got the data from fitbit intraday API, under the calories categories

Here's the data's information :

https://dev.fitbit.com/docs/activity/

Also, is the value of level direct relative to METs?

Thanks in advance.

[Colinm39]

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@jeeyi345 wrote:

Hi,

I'm using fitbit Charge HR, and the METs I got are always very high, the minimum is 9, and the highest and up to more than 100.
From my understanding of METs calcuation we have to do very hard exercise to get METs higher than 6, is there something wrong about my understanding of fitbit's value?

I got the data from fitbit intraday API, under the calories categories

Here's the data's information :

https://dev.fitbit.com/docs/activity/

Also, is the value of level direct relative to METs?

Thanks in advance.

---

@jeeyi345 The Fitbit records Active Minutes from 3 METs and above. But I notice in your API link it states

"activities/activityCalories - The number of calories burned during the day for periods of time when the user was active above sedentary level. This value is calculated minute by minute for minutes that fall under this criteria. This includes BMR for those minutes as well as activity burned calories.

I have always thought Sedentary was about 1.2 METs, Fitbit total Sedentary minutes but we never know what they are in calorific value. Or, is it the difference between 3 METS and Sleeping/Rest ?.

Can anyone help

[jeeyi345]

@Colinm39
The METs Sedentary minutes were like 9, 10, or 11

And the sum of a day (1440 minutes of METs) is more than 23 thousand, like 23819.

So I was thinking maybe the value is 10 times more? Like 1.0, 1.1, during the active minutes like 5.1,6.4.

But the METs stored in integer, and there are other fields using the decimal point, so if my guessing was right , why don't fitbit choose the decimal point to store METs too?

Maybe I was wrong, hope the issue to be verified, and thank you and anyone for the reply

[johnyu0424]

I found this while searching on how to get METs from the API. So it you're looking to get minute level METs data, you can use the activities/calories. If you have access to the intraday time series data, you'll see it. Sample:

https://api.fitbit.com/1/user/-/activities/calories/date/today/1d.json

Sorry to go off topic.

[johnyu0424]

 This question was asked more than a year ago, but I think what @jeeyi345 said makes sense. And @aarondcoleman said the same thing here. Hopefully this will help other people.

[Kevin_H]

Fitbit folk, could still use your derivation details and any supporting validation please?