Haha, I can imagine it would be true, but would certainly depend on the fitness, style/genre, and technique.

Here’s the heartrate graph to match post. I consider my technique very good at being conservative, but there’s clearly times there I was playing something fast and furious that jacked heartrate (mainly punk-style rockabilly).

Edit: Can legit see where I played fast, thought, “Okay, need something easier.” and did lower BPM before being drawn back into fast shit again.