Brief Description
“Tying up” or exertional rhabdomyolysis refers to muscle stiffness and pain after exercise. It can occur sporadically or chronically. Sporadic “tying up” is due to a temporary problem in muscle cells caused by fatigue, heat exhaustion or electrolyte imbalance, and can occur in any breed. Chronic “tying up” is an inherited problem with the way muscle cells use calcium, and is mainly seen in Thoroughbreds, Arabians and Standardbreds. Signs range from a slight shortening of stride to reluctance to move or even laying down.
Possible Diagnostic Tests
“Tying up” can usually be diagnosed by simple bloodwork, but in more complicated cases, veterinarians may need to perform a urinalysis, muscle biopsy or exercise challenge tests to figure out the underlying problem.
Prescription Medications Available
Fluids may be used to rehydrate the horse. Tranquilizers and pain relievers such as “bute” (phenylbutazone) and Banamine® (flunixin meglumine) may be administered to make him more comfortable. Robaxin (methocarbamol) and Dantrium (dantrolene) are muscle relaxants frequently prescribed for this condition.
Supplements that May Lend Support
Horses with the sporadic version of “tying up” may have imbalances in their diet or inconsistencies in their training program. These issues may be corrected through the use of dietary supplements, a change of feed or a more regular training schedule. When modifying the diet, particular attention should be paid to whether or not Vitamin E and Selenium supplementation is necessary. The horse’s electrolyte requirements should also be considered.
Horses with the chronic version of “tying up” should also have their diet examined for the nutrients mentioned above. In addition, research has shown some benefit to supplementing with the minerals Chromium and Magnesium. There are also anecdotal reports of benefit from adding Dimethylglycine (DMG) to the diet.
Other Management Suggestions
Diet
Horses that chronically tie up may benefit from a low-sugar/high-fat diet. Reducing sugar in the diet may help reduce excitement and anxiety, while adding fat replaces sugars and starches (simple carbohydrates) for both energy and weight maintenance.
Other
Owners of horses that tie up should try to avoid stress and “trigger factors.” Beneficial management practices include increasing turnout and decreasing stall-time. Providing controlled exercise such hand walking, lunging or riding on a daily basis may also help, as well as avoiding activities that upset that particular horse.
Questions to Ask Your Veterinarian
- Does my horse have sporadic or chronic “tying up”?
- Could my horse have Polysaccharide Storage Myopathy or PSSM, (a health condition that causes chronic “tying up”)?
- How soon after a bout of “tying up” can I return my horse to work?
For more information on this topic or general horse care information, contact a SmartPak Product Specialist at 1-800-461-8898 or visit the website at www.SmartPakEquine.com.
Article provided by SmartPak.
Dr. Lydia Gray is the Medical Director/Staff Veterinarian for SmartPak, where she guides research and new product development, answers questions on her Ask the Vet blog, and speaks around the country at various events such as Equine Affaire, Dressage at Devon, and the USHJA Trainers’ Symposiums. |
