"Our findings showed that the dogs had a clear impact on the children's stress hormone levels," says Sonia Lupien, senior researcher and a professor at the Université de Montréal Department of Psychiatry and Director of the Centre for Studies on Human Stress at Louis-H. Lafontaine Hospital, "I have not seen such a dramatic effect before."
Cortisol the telltale indicator of stress
To detect stress-levels, Lupien and colleagues measured the amount of cortisol present in the saliva of autistic children. Cortisol is a hormone that is produced by the body in response to stress. It peaks half-hour after waking up, known as the cortisol awakening response (CAR) and decreases throughout the day. Moreover, it is detectable in the saliva, which makes sampling its levels easy. …show more content…
"CAR is a very useful marker of stress," say Lupien. "We used it to determine the effect of service dogs on the children's stress levels by measuring it in three experimental conditions; prior to and during the introduction of a service dog to the family, and after the dog was