Taking the pulse of anglers

I had a long chat with a fellow angler this afternoon where he suggested that people with lower pulse rates were potentially better fly anglers than those with faster pulse rates.

The theory goes that the high-pulsed anglers will be more excitable and more prone to the kind of impetuous behaviour that simply doesn't catch fish.

I wonder if anyone has ever done a study on this, or has researched whether fishing in most circumstances is the type of past time that lowers your heart rate? I say "most circumstances" as I can think of one or two where the heart really starts racing. An interesting idea nonetheless.