> For the complete documentation index, see [llms.txt](https://docs.tryterra.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tryterra.co/faq/help-topics/data-api-sdk/data-model-fields-and-units/field-definitions-and-enum-lookup.md).

# Where do I find field definitions and enum values?

Full field-by-field definitions for every payload type are in the API reference [data models](https://docs.tryterra.co/reference/health-and-fitness-api/data-models) section, and enum values like `ActivityType` are listed there too.

A few specifics:

* Sample arrays (`hr_samples`, `calorie_samples`, `activity_levels_samples`, etc.) contain timestamped individual measurements, a granular time series rather than summaries.
* The `data_provided` field is an array of data-type enum values describing what the device contributed.
* As an example, `user_max_hr_bpm` is the user's maximum heart rate based on age and other factors, as determined by the provider.

Use the dashboard **payload simulator** to generate example payloads and inspect exact shapes.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.tryterra.co/faq/help-topics/data-api-sdk/data-model-fields-and-units/field-definitions-and-enum-lookup.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.