Therapeutic Horseback Riding for Youth With Autism and Psychiatric Comorbidities: A Randomized Trial.

Therapeutic horseback riding and related equine-assisted activities can significantly reduce behavioral issues such as irritability and hyperactivity in youth with autism who also have psychiatric conditions. The study shows that these interventions improve emotional regulation and social behavior, with therapeutic horseback riding providing additional benefits for hyperactivity.

Study Background and Objective

• Youth with autism spectrum disorder (ASD) often experience psychiatric comorbidities, complicating their care.
• Traditional treatments may not fully address behavioral challenges such as irritability and hyperactivity in this population.
• Equine-assisted services (EAS), which involve interaction with horses, have shown early promise in improving behavioral outcomes.
• The study aimed to evaluate the effectiveness of different equine-assisted interventions for youth with autism and psychiatric comorbidities, specifically focusing on behavioral improvements.

Study Design and Population

• Participants: 236 youth aged 6-16 years diagnosed with autism and psychiatric comorbidity.
• Design: A multisite randomized controlled trial (RCT) stratified by nonverbal IQ to ensure balanced cognitive levels.
• Intervention arms:
  • Therapeutic Horseback Riding (THR) – structured horseback riding therapy.
  • No Horse Contact Barn Activity (BA) – animal-related activities without riding.
  • Waitlist Control followed by a BA/THR hybrid intervention.
• Caregivers assessed participants’ behavioral outcomes, with speech outcomes evaluated by blinded rating experts.
• The interventions built on methods from a previous trial, potentially enhancing their efficacy.

Key Outcome Measures

• Primary outcomes measured were irritability and hyperactivity, common behavioral challenges in ASD with psychiatric comorbidity.
• Secondary outcomes included emotional regulation and social behaviors.
• The study used standardized measures rated by caregivers, increasing ecological validity.

Main Findings

• Out of 236 enrolled, 169 participants completed at least one intervention session and were included in the intent-to-treat analysis.
• Compared to the waitlist control (n=28), both THR (n=74) and BA (n=67) groups demonstrated:
  • Clinically significant reductions in irritability with high effect sizes (THR d=1.15, BA d=1.04).
  • Clinically significant reductions in hyperactivity (THR effect size d=1.06, BA d=0.68).
• The THR group showed a significantly greater reduction in hyperactivity compared to the BA group starting from week 4 of intervention (effect size d=0.39).
• Both intervention groups improved in emotional regulation and social behavior relative to the control group.

Interpretation and Implications

• Equine-assisted activities (both THR and BA) are effective for reducing behavioral issues such as irritability and hyperactivity in children with ASD and co-occurring psychiatric symptoms.
• The horseback riding component in THR possibly provides additional benefits beyond barn activities alone, particularly for hyperactivity.
• This suggests that the physical and sensory engagement of riding may have unique therapeutic effects.
• Improvement in emotional regulation and social behaviors indicates that equine-assisted services may offer holistic benefits addressing multiple domains affected in ASD.
• The interventions are feasible and safe examples of complementary therapies that could integrate with existing treatment plans.

Study Strengths and Considerations

• Large sample size and randomized controlled design enhance reliability of findings.
• Use of caregiver-reported outcomes supplemented with blinded speech assessments reduces bias.
• Multisite design increases generalizability across different settings.
• Limitations may include variability in intervention delivery and participant engagement.
• Further research could explore long-term effects and mechanisms underlying equine therapy benefits.