Salutations Adrfair,
Welcome to Apple Support Communities!
It sounds like you want to know these specific measurements when Apple Watch is used to measure your heart rate.
"Workout" will show you the measurement during a workout period, "Streaming" sounds like it's your normal monitoring, and "Sedentary" sounds like the measurement while you are, sitting or at rest.
You will find a detailed explanation of the Apple Watch and its heart rate measurements here: Your heart rate. What it means, and where on Apple Watch you’ll find it. Specifically, review the section under "When Apple Watch measures your heart rate".
Cheers!