Running: Power Output vs Heart Rate

What is Power Output and what is Heart Rate? How do they relate to running? What does each metric tell you? When should you use one vs when you should use the other?
Louise goes a little more in detail about these two important running metrics, helping us understand the differences and shares which ones she uses for her training.
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[@fabreezethefaintinggoat5484]

thanks

[@Runningshoesgurucom]

You're welcome!

[@tadejdanev5030]

with 6x pro i don't get that data :(

[@Runningshoesgurucom]

really no power output?