Officers are trained to remain ready, alert, and responsive from one call to the next. Over time, however, operating in a persistently elevated state carries real costs. This is not a question of toughness or motivation; it is a question of capacity.

Performance is often viewed as a reflection of training and skill, but there is another factor at play: physiological arousal. Arousal reflects how the nervous system responds in real time and continuously shapes performance in policing, both moment to moment during critical incidents and cumulatively across a shift and career. How the nervous system is functioning influences judgment, decision-making, and motor control under pressure, while also contributing to error rates and longer-term strain on health and capacity.