Psychophysiological stress testing (PST) should be routinely administered to all athletes at intake. This test provides an additional layer in the evidence hierarchy by extending Athlete’s Profile Primary Higher Order (AP PHO) constellation self-report and behavioral measures to underlying mind-body responding. Feelings of discomfort, worry, nervousness, and overall stress are expected to heighten in athletes with the most detrimental AP PHO constellation or in athletes who score high for neuroticism/subliminal reactivity (N/SR), and induce changes in heart rate variability (HRV) that are associated with increases in sympathetic nervous system (SNS) activity. While differential levels of activation are usually necessary for sport performance, in the context of a static situation and cognitive stressors, greater low frequency (LF) and accompanying SNS is hypothesized to be disruptive and interfere with mental tasks, such as strategic planning as a precursor to motor action.