About to start a new thread on the basics of "Range Etiquette" and how not to be that guy at the range! Sorry to stray from the topic brother.
That's OK, but back to the topic, logic would dictate that anything that contributes to an elevated heart rate woul affect long range accuracy. We've all read the stories about breaking the trigger between heart beats and I think there is merit in the argument. I just don't think (at the 350-400yd ranges) I'm dealing with it really matters so I'll continue to indulge.