Humans who have chronic lung or heart disease often breathe through a device that resists inhalation to increase muscle strength. Called inspiratory muscle training (IMT), this therapeutic technique trains both the diaphragm and the upper airway muscles to become stronger, improving respiratory strength, according to EQUUS magazine.
Dr. Kate Allen of the University of Bristol wanted to see if the technique could be applied to horses. In people, respiratory performance is limited by cardiovascular capacity; in horses, athletic performance is limited by respiratory function. Using IMT to improve the fitness and function of the respiratory muscles allows them to work more efficiently.
Allen and a study team acclimated 10 Thoroughbreds in steeplechase training to wearing a mask fitted with valves that control the level of resistance to each inhalation. The horses underwent IMT training five days a week for nine weeks. During each session, the horse took 30 resistant breaths, was rested for two minutes, then took 30 more resisted breaths, all while standing still. The resistance was increased every four days, but the trial allowed for an increase or decrease in resistance depending on how the horse tolerated the change. The horses continued normal racing and training schedules during the study, and tests of each horse's respiratory strength were made before and after the IMT.
The scientists found that horses had no issues adapting to IMT training and that it can be used on horses in competition. The next study will look at IMT training and its impacts on physiologic and performance changes in the horses.
Read more at EQUUS magazine.
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