Research Update: The Effect Of Equine Bodyweight On Performance

A recent study conducted by scientists in Sweden and Iceland examined the effect of altered body weight and body fat content on exercise performance and recovery. Nine horses were divided into two groups, and changes in bodyweight and fat content were induced by feeding a high or restricted energy diet. After 36 days, horses were switched to the other diet and the study was repeated. In the last week of each diet, bodyweight and body condition score were recorded, body fat percentage was estimated using ultrasound, and a standardized incremental treadmill exercise test and competition-like field test were performed.

Bodyweight, body fat percentage, and body condition score were higher (5 to 8 percent) in high energy horses compared to horses fed the restricted energy diet. In the standardized exercise test, horses on the high energy diet performed more poorly and recovered more slowly compared to horses fed the restricted energy diet. Additionally, locomotion asymmetry was greater in horses fed the high energy diet compared to the restricted energy diet. These results confirmed that increased bodyweight and body fat in horses lowered physiological fitness, reduced symmetry, and decreased performance ability. For more information on this research, read the paper published in Physiological Reports.

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Research Into Training Programs Needed To Protect Equine Tendons

The superficial digital flexor tendons in a horse's front legs are responsible for much of the animal's athleticism: They store energy and play a critical role in the efficiency of the horse's trot and gallop. However, these tendons are especially susceptible to injury: They are one of the most common causes of lameness in performance horses. Tendon injuries are slow and difficult to heal, so it's imperative that they be detected early and that training methods be adapted to allow time for the tissues to heal.

Drs. Claire O'Brien, Neil Marr and Chavaunne Thorpe investigated the biomechanical and biothermal effects of strain on this tendon and how both forces contributed to microdamage. Though the tendon is essential for efficient performance and locomotion, it has a very narrow window for error, which makes it susceptible to injury.

The trio reviewed 140 scientific papers and discovered that most superficial digital flexor tendon injuries occur during fitness work. Risks to tendons include variations in training intensity and frequency, surfaces and equipment. Individual risk factors include breed, age and sex; variations in tendon blood supply, strength and flexibility may contribute to chronic tendon injuries and longer recover rates.

The team suggest that research be done in several areas so that recommendations based on scientific principles can be made for training programs; these would minimize the risk of tendon injury. They also suggest that those involved in a horse' training understand the following:

  • The physiologic demands high-intensity training places on equine tendons
  • Heavy training sessions that mimic competition should be closely monitored and only repeated every 72 hours to allow tendons enough time to repair and adapt. Factors such as the horse's age, history of injury and previous competition experience should help guide decision making on the frequency of training sessions
  • The effects of other factors like surface type, fence height, bandaging and ambient temperature place on tendon temperature and strain
  • Training should be increased incrementally over time, using objective measures to gauge each horse's physiologic response

Read the full article here.

Read more at HorseTalk.

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