US Study Finds Horse-Based Therapy Eases Children's Stress During Autism Sessions

Researchers at Colorado State University's Temple Grandin Equine Center, in the United States, have found that occupational therapy sessions involving horses ease children's physiological stress response more effectively than equivalent clinic-based sessions. The study, published in the Journal of Autism and Developmental Disorders, followed 72 autistic children aged six to eleven through ten weeks of weekly one-hour sessions, split between horse-involved therapy and traditional clinic therapy. Saliva samples taken before, during and after each session measured cortisol, a stress hormone, and alpha-amylase, a marker of nervous-system activity. Cortisol fell in both groups, but the drop was significantly larger among children working with horses, while alpha-amylase rose during sessions and settled back to baseline afterwards in both groups, a pattern the researchers associate with engagement rather than distress.

Lead researcher Caiti Peters, an assistant professor in the university's departments of Occupational Therapy and Animal Sciences, said the calming effect of horse-human interaction has often been described anecdotally as "magic," and that the physiological measurements help explain what is happening beneath that impression. The finding builds on a 2021 CSU study that reported behavioural gains, including increased social motivation and reduced irritability, among autistic children taking part in horse-involved occupational therapy. The centre, which runs sites in Fort Collins and Denver, hosts around 11,000 such appointments a year.

The research looks at the benefit to the child rather than the experience of the horse itself, a distinction worth keeping in mind alongside separate welfare research into how therapy and activity horses fare during this kind of work. Taken together, the two strands point in a similar direction for breeders and owners: equine-assisted therapy is a growing and evidently valuable field, and it depends on horses that are not only temperamentally suited to the work but whose own wellbeing is monitored and supported throughout it.