Ok sorry for the confusion!!!!
From what I gather from the link there, its just tying up. I guess you can change their diet, we have 2 horses that are prone to tying up, but we never changed their diets. We just watch how we work them. If they get a day off, the next day they don't work hard. Watch for sweating while working. They will begin to sweat the most behind the ears if they are prone to tying up. Its a good sign to stop working them. Make sure to cool them out properly after working. We also give ours a drug called RVI (Rubeola Virus
Immunomodulator) now, this has NO connection with tying up. Its actually used to treat myositis, but has also been showed to improve horses with navicular. And for some reason it helps with horses who tie up. I don't know why, but we were recommened it by a vet. Since we started giving it, our horses have not tied up at all. Its given under the skin, NOT in the muscle. If you hit the muscle the neck will blow up like you have never seen a neck blow up. Its a HUGE poblem then, we have never had that happen thank god.... anyway, other than that, adding a handfull of baking soda to every meal helps too. If you don't want to use that, you can use a powder called "Bounce Back", its basically sodium bicarbonate (baking soda) with some added minerals. Sodium bicarbonate helps with potassium depletion.
My biggest advice to you, DO NOT MOVE A HORSE WHO IS TIED UP. Back in the old days (and sometimes even now) people believed to walk them out of it. Don't. Its the WORST thing you can do for a horse whos tied up. Leave them still. If it is not bad they usually come out of it fine themselves.... BUT if it is bad give the horse bute, banamine, and some tranquilizers (ace promazine) to help him relax his muscles. If its bad, call a vet too. Horses CAN die from tying up!!!!!!!
There really is no treatment for tying up... its mostly all preventative. Good luck.