How frequently can we get heart rate from Fitbit

[we179]

Hi every one,

I want to know how frequently can we get heart rate from Fitbit and what is the delay? That is, if I am wearing a Fitbit watch and my own written app wants to get the heart rate, how often can I get it ? And what is the delay in getting the info.

Thanks in advance

[Gondwana]

Fitbit devices normally provide updated heart-rate values every 5 to 15 seconds (1 to 3 seconds in 'exercise' mode).

If you use messaging and WebSockets, you can get the data within a small fraction of a second; I can't actually perceive the delay.

See also this thread (complete with lousy video).

[we179]

Many thanks for your response.

[we179]

Hi again,

Do you know if my written app can put Fitbit devices into workout mode, so we can get continuous and frequent reading?

[Gondwana]

I think the exercise API can do it. See here.