Catecholamine responses to virtual combat: implications for post-traumatic stress and dimensions of functioning

Area of Science:

• Neuroscience and Psychology
• Military Mental Health Research

Background:

• Posttraumatic stress disorder (PTSD) symptoms can cause functional impairment in service members (SMs), even without a diagnosis.
• Catecholamine mechanisms may explain outcome variability, with known elevated basal levels in PTSD but less understanding of responses to trauma stimuli.

Purpose of the Study:

• To investigate if catecholamine responses to a virtual combat environment influence the link between PTSD symptom clusters and functional outcomes.
• To explore the mind-body connection in SMs' responses to post-deployment stressors.

Main Methods:

• Eighty-seven clinically healthy SMs, recently deployed, completed self-report measures.
• Participants viewed virtual-reality (VR) combat sequences while undergoing sequential blood draws.
• Norepinephrine levels were measured in response to VR combat exposure.

Main Results:

• Norepinephrine response to VR combat moderated the relationship between avoidance symptoms and physical functioning, physical-role functioning, and vitality.
• High avoidance was linked to an inverse association between norepinephrine change and functional status.
• Low avoidance showed a positive correlation between norepinephrine change and functional status.

Conclusions:

• Novel use of VR combat stimuli in returning SMs elucidates mind-body connections.
• Findings enhance understanding of post-deployment symptoms and quality of life in SMs.
• Results may inform future treatment enhancements for PTSD and related functional impairments.