Did a ride today where I climbed up a gravel road and targeted Sweet Spot. Jumped on the single track and worked skills down the hill. Big fun!
Does Training Peaks calculate TSS only on what my power meter report or does it consider when my heart rate climbs bombing down hill. There was a few “I lived through that!” Moments that spiked my heart rate.
If you’re using a power meter, then TSS is only based on power. So no bonus points for scaring yourself 
If you have no power meter Training Peaks does calculate load from your heart rate, you will see it listed as hrTSS on your ride.
If you have both a power meter and a heart rate monitor you can change the load from TSS to hrTSS. You can see just how different the values are!