Arousal Ventilation Elevated in PTSD Sleep

A new study from the University of Melbourne reveals a specific breathing-related trait in young adults with symptoms of post-traumatic stress disorder (PTSD), which could explain their future risk for obstructive sleep apnea (OSA).

The PTSD and Sleep Apnea Puzzle

Research has consistently shown that obstructive sleep apnea is far more common in military veterans with PTSD than in the general population. For years, a central question remained: is this link due to factors specific to military service, such as blast exposures or physical injuries, or is it related to PTSD itself?

The research team, led by Maya T. Schenker and Professor Amy Jordan, aimed to find out. They recruited 60 young adults with a range of PTSD symptoms stemming from non-military traumas. Participants were categorized into three groups: those with “Likely PTSD,” “Subsyndromal PTSD,” and “No PTSD.” Each underwent a detailed overnight sleep study to measure breathing patterns and sleep architecture.

Methodology: Measuring the Breath After Arousal

The study’s primary goal was twofold. First, the team compared the prevalence of OSA across the three groups using the apnea-hypopnea index. Second, and more novel, they measured a key physiological trait known as the ventilatory response to arousal.

This trait measures how much a person’s breathing increases in the few breaths immediately after they briefly wake up from sleep. A robust response can destabilize breathing control, making subsequent airway collapse more likely—a known contributor to OSA pathogenesis. The researchers analyzed clean nasal pressure traces from 29 participants who did not have OSA, providing a clear look at this reflex without the confounding noise of apnea events.

Findings: A Hidden Risk Factor Emerges

The results were revealing. The number of individuals diagnosed with OSA was low and not statistically different between groups: only 4 in the Likely PTSD group, 3 in the Subsyndromal group, and 1 in the No PTSD group. The average apnea-hypopnea index was also similar.

The critical difference lay in the physiology. The ventilatory response to arousal was significantly larger in individuals with both Likely and Subsyndromal PTSD compared to those with No PTSD. This means that after a brief, spontaneous awakening, the breathing drive surged more intensely in those with PTSD symptoms.

“Although these young individuals with Likely PTSD did not commonly have OSA, the ventilatory response to arousal was elevated,” the authors concluded in their paper published in J Clin Sleep Med (doi: 10.1007/s44470-026-00050-6).

Practical Implications: A Pathway for Prevention and Treatment

This finding has important implications. It suggests that PTSD, even at a subsyndromal level, may alter fundamental brainstem circuits that control breathing during sleep. The elevated ventilatory response acts as a latent risk factor. In a young, otherwise healthy person, it might not cause disease. But combined with other classic OSA risk factors—such as weight gain, aging, or hormonal changes—this trait could tip the balance and predispose someone to develop clinical sleep apnea later.

This creates a potential new treatment pathway. If a heightened breathing response to arousal is part of the problem, then therapies aimed at calming this overactive reflex could be beneficial. The study authors note this “may represent a PTSD-specific OSA treatment pathway.” Techniques that promote respiratory stability and reduce hyperarousal may be particularly effective. For instance, breathing biofeedback has been shown to speed up PTSD recovery in therapeutic settings, potentially by helping to regulate such automatic responses.

Furthermore, practices that generally rewire the stress response through breathwork could be investigated as preventive tools for this population. The connection between stress, carbon dioxide sensitivity, and breathing patterns is well-established, as seen in research on how neuroinflammation can trigger panic via CO2 sensitivity.

Conclusion: Looking Beyond the Diagnosis

The work by Schenker, Jordan, and colleagues shifts the focus from simply counting apnea events to understanding the underlying physiology. For young trauma survivors, the absence of a sleep apnea diagnosis today does not guarantee resilience tomorrow. Identifying this heightened ventilatory trait opens the door for early monitoring and targeted interventions.

It underscores the deep interconnection between mental and respiratory health. A disorder of traumatic memory and fear appears to express itself, in part, through the simple, automatic act of breathing during sleep. Addressing one may help soothe the other, offering a more integrated approach to long-term health for those living with PTSD.