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Biomarker suggests another perk of service dogs for veterans

Veterans with post-traumatic stress disorder may benefit physiologically from using service dogs, new research shows.

“Our long-term research goal is to quantify how service dogs may affect the health and well-being of military members and veterans with PTSD,” says Maggie O’Haire, assistant professor of human-animal interaction at Purdue University.

“This study compared a group of veterans with PTSD who had a service dog to a group on the waitlist to receive one. Our previous research suggests that the presence of a service dog reduced clinical PTSD symptoms and improved quality of life. In this study, we wanted to determine if those beneficial effects also included changes in the physiology of stress.”

The study is the first published research to use a physiological marker to define the biobehavioral effects of service dogs on veterans with PTSD, say the researchers.

“We chose to focus our assessments on cortisol as it is a biomarker centrally involved in the stress response system,” says Kerri Rodriguez, a human-animal interaction graduate student and lead author of the paper in Psychoneuroendocrinology.

In this way, the study seeks to improve the understanding of the potential mechanisms for how and why a service dog may help this population, researchers say.

Cortisol can be measured non-invasively in saliva, which enabled the veterans to collect samples themselves at home immediately after waking up in the morning and about 30 minutes later. This allowed researchers to look at how much cortisol was being produced during the morning.

The magnitude of the “cortisol awakening response” has been extensively studied and is used as a metric of the effects of chronic and acute stress. Non-PTSD, healthy adults experience an increase in cortisol after waking up.

“We found that military veterans with a service dog in the home produced more cortisol in the mornings than those on the waitlist,” Rodriguez says. “This pattern is closer to the cortisol profile expected in healthy adults without PTSD. Having a service dog was also associated with less anger, less anxiety, and better sleep.”

While this finding is important, it should be taken in context, researchers warn.

“These findings present exciting initial data regarding the physiological response to living with a service dog. However, the study did not establish a direct correlation, on an individual level, between cortisol levels and levels of PTSD symptoms, and further study is needed. It is important to keep in mind that service dogs do not appear to be a cure for PTSD,” O’Haire says.

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The next step, already underway, involves a large-scale National Institutes of Health clinical trial in which the researchers are studying veterans with and without service dogs over an extended period of time.

“Our research team will be able to look at morning cortisol levels both before and after getting a service dog to see how these physiological effects manifest over time,” O’Haire says. “The longitudinal nature of this clinical trial should bring about a better understanding of the interrelationships between physiological and behavioral processes, PTSD symptoms, and service dogs.”

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The participation of veterans in the studies should not be taken for granted, O’Haire says. “We are most grateful to the military veterans and their families who have participated in the research thus far. We are honored to be collaborating with these individuals to advance the science behind our interactions with animals and how they affect human lives.”

Source: Purdue University

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