Low-intensity exercise may ease airway obstruction in severe equine asthma

Low-intensity, field-applicable exercise may temporarily open the airways in horses with severe equine asthma, according to a new Equine Veterinary Journal study from Sophie Mainguy-Seers, Sarah-Maude Grondin, and Jean-Pierre Lavoie. The study found that submaximal aerobic exercise produced a mean roughly 50% drop in pulmonary resistance, a bronchodilation effect the authors say was comparable to bronchodilator therapy. The finding adds a practical wrinkle to severe equine asthma management, a condition still centered on environmental control and anti-inflammatory treatment rather than bronchodilators alone. (vettimes.com)

Why it matters: For equine veterinarians, the study suggests carefully controlled exercise could have physiologic benefit beyond conditioning in some horses with severe asthma, at least under selected circumstances. That doesn’t replace the basics: severe equine asthma is strongly linked to dust and mold exposure from hay and bedding, and current guidance still emphasizes antigen avoidance plus medical therapy when needed. That context is especially important because a second new EVJ paper found steamed hay did not prevent deterioration in lung function or airway inflammation versus dry hay in horses with severe equine asthma in remission, reinforcing that management strategies may not perform as expected in every setting. (thehorse.com)

What to watch: Watch for follow-up studies defining which horses benefit, how long the bronchodilation lasts, and whether exercise can be safely incorporated into treatment plans during remission or mild flare periods. (vettimes.com)