They include methodic range procedures, good attitude, and race preparations. After skiing a fast 3 km sprint, shooting against the clock with competitors next to you is really distracting. You also hear their knock down targets falling after each shot. If your cadence is slower than the person next to you, hearing their shots and hit targets will urge you to rush your shot and miss. Practicing rock steady focus and cadence to your shooting helps remedy this.
Attitude is probably more important than most realize.
I enjoy races more if I'm not super competitive, but it also seems to help my shooting if I'm relaxed and feeling happy to be a part of the event. If I was super competitive during a race I bet I'd tense up, rush shots, and get distracted easily by other racers. We could all use a good attitude and encourage each other, for the overall success and continuation of Biathlon. Heart rate is an interesting topic. I remember as a kid seeing on TV a news piece about US Biathlon team members attached to heart rate monitors and using only mind control to lower their heart rate.