Sheepdog Tip of the Day, During Combat tip 28
Pomerleau and Lazzarini found that when the average police officer experiences a stress induced (i.e., adrenaline-induced) heart rate increase in the area of 145 beats per minute (bpm), there is a significant breakdown in performance. But this is not true for everyone. Apparently, if you have practiced the required skills extensively, you can "push the envelope" of Condition Red, enabling extraordinary performance at accelerated heart rate levels. Let us call this zone, roughly between 145 and 175 bpm, "Condition Gray." (Beyond Condition Gray is "Condition Black," an area marked by catastrophic breakdown of mental and physical performance.)
Lt. Col. Dave Grossman, On Combat
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Additional Resources
For PTSD, Shepherd Resource Group.