Garmin Client and unknown_fields

Former Member
Former Member

Hello, i was trying to parse and take my sleep records (The record came in .fit file) for garmin connect using google colab. After i convert the data to a dataframe type, 

appeared some fields identified as 'unknown'. Appeared 6 field (index,stress_level_time,stress_level_value,unknown_2,unknown_3 and unknown_4.

My doubt is, What this unknown fields means or how can i discover that?