A number of years ago I accidentally discovered the benefit of exercise for my horse’s heaves. Vets had said to keep heavey horses as fit as possible to make everything easier when their breathing was bad, but none had talked about the immediate benefit on the bad day. I am sure there are some types of heaves that will not respond to exercise, but my horse’s did, with the benefits lasting for hours.
My horse has PSSM and needs exercise to prevent issues. One day I hopped on my horse with just a saddle blanket and hackamore to take him for a walk. After a bit he perked up and I asked if he wanted to trot, he did. A little later we trotted again, I asked if he wanted to canter and got an enthusiastic “Yes! Faster!” Six strides later he ran out of oxygen, gasped and slowed his canter.
I thought “Okay, that’s his limit.” and continued walk trotting along the trails. I invited him to canter again later in the ride, again got the enthusiastic “Yes! Faster!” and didn’t find his limit! I had to slow him down for the corner because he wasn’t going to do it himself.
In talking to my vet afterwards, they said that it made sense because exercise naturally induces the airways to open. Over time I found that his breathing in the evening, while worse than after recovering from the ride, was still significantly better than it had been before the ride. I was listening to his lungs and counting his breath rate before and after exercise, by that point so I could see the difference in the numbers as well as hear the difference in his lungs.
Years later, his heaves had progressed, and exercise still made a huge improvement on days he was audibly wheezing. Those rides were very hard for me to do, but I did the first one knowing that exercise had helped in the past, and subsequent ones knowing the wheeze had disappeared during the ride.
I didn’t just go for a ride. I asked him to do what he was capable of doing. A couple of coughs meant his breathing was pushing the edge of capability, which was enough stress to trigger dilation of the airways. Continuing coughing meant too much exertion, and he needed to slow down until his lungs caught up. He was usually happy to go out on the trails and I often had to remind him that he couldn’t go faster than he could breathe. He had to stay in aerobic exercise to get the benefit.
Injuries over the last few years have forced me to do a lot of handwalking. I’ve found that alternating normal walking with a fast walk, switching up every 20-30 steps, is enough to trigger airways dilation and help his breathing. If he’s up for it, alternating walk and jog works well too. I’ve been doing this for years at this point, and I still feel like a big meanie making him walk when his whole body jerks with every breath, or I can hear the wheeze. But I’m still doing it because it works so well for him.
This is in addition to his medication. One day I forgot to give him his meds before I rode. His breath rate was 32 breaths per minute before the ride, and down to 18bpm after recovering from the ride with ZERO medication. I remembered the meds right before I put him back out.