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Related Concept Videos

Post-traumatic Stress Disorder01:27

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Post-traumatic stress disorder (PTSD) is a psychiatric condition that arises following exposure to traumatic events such as natural disasters, forced displacement, or severe accidents. It significantly impairs individuals' ability to cope with daily activities and disrupts their emotional and psychological equilibrium.
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Stress is a multifaceted response to events perceived as challenging or threatening, highlighting physical, emotional, cognitive, and behavioral reactions. Physically, stress can lead to fatigue, sleep disruptions, and various health issues such as frequent colds, chest pains, and nausea. Emotionally, it can manifest as anxiety, depression, irritability, and anger triggered by both minor and major life events. Cognitively, it may result in difficulty in concentration, memory, and...
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Panic Disorder01:27

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Panic disorder is an anxiety disorder characterized by recurrent and sudden minutes-long episodes of intense fear, known as panic attacks. These attacks may feel like heart attacks and often happen without warning or a specific cause. They can include symptoms such as rapid heart rate, shortness of breath, chest pain, trembling, sweating, dizziness, and a sense of helplessness. During a panic attack, individuals may feel as though they are experiencing a heart attack or are in a...
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Psychoneuroimmunology (PNI) is a multidisciplinary field that examines how psychological factors, particularly stress, interact with the immune system and impact physical health. Research in PNI has shown that chronic or traumatic stress can disrupt both the hypothalamic-pituitary-adrenal axis and the sympathetic nervous system. These disruptions contribute to serious health conditions, including cardiovascular diseases.
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Posttraumatic Stress Disorder Is Associated With a Decrease in Anaerobic Threshold, Oxygen Pulse, and Maximal Oxygen

Michael J McMahon1, Aaron B Holley2, Whittney A Warren3

  • 1Tripler Army Medical Center, Walter Reed National Military Medical Center, Bethesda, MD.

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Posttraumatic stress disorder (PTSD) in combat veterans is linked to reduced exercise capacity, specifically a lower anaerobic threshold and peak oxygen uptake. This deconditioning effect is independent of lung function and respiratory reserve.

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Area of Science:

  • Cardiopulmonary Physiology
  • Military Health
  • Psychotraumatology

Background:

  • Posttraumatic stress disorder (PTSD) is associated with respiratory symptoms and functional limitations.
  • The underlying mechanisms connecting PTSD to respiratory issues remain unclear.

Purpose of the Study:

  • To investigate the relationship between PTSD, lung function, and cardiopulmonary exercise response in combat veterans with chronic respiratory symptoms.

Main Methods:

  • Prospective enrollment of military service members with respiratory symptoms post-deployment.
  • Comprehensive evaluation including pulmonary function and cardiopulmonary exercise testing.
  • Multivariable linear regression used to compare outcomes between PTSD and non-PTSD groups, adjusting for confounders.

Main Results:

  • Participants with PTSD reported more respiratory symptoms.
  • No significant differences in airway disease or lung volumes were found.
  • PTSD group showed reduced diffusing capacity (eliminated with hemoglobin adjustment), lower anaerobic threshold, peak oxygen pulse, and peak oxygen uptake.

Conclusions:

  • PTSD diagnosis in combat veterans is linked to objective reductions in cardiopulmonary exercise capacity.
  • These reductions in exercise performance are independent of baseline lung function and may be attributed to deconditioning.