
Exerpt
Observations on the Report of the

The range of motion in flexion is equally great. A dressage horse with its nasal profile vertical to the ground obviously has a 90¼ nasal angle (45¼ of flexion based on jowl angle). Such a horse during a dressage performance is already experiencing a severe degree of airway obstruction at the level of the throat. An over-bent horse with its chin on its chest may have a nasal angle of 128¼ (75¼ of flexion - see Fig 14). Such a position is natural enough in a stationary horse, if only held fleetingly and entirely voluntarily. When artificially maintained for either short or long periods at the walk, trot and canter, such a horse is - as I shall show - being asphyxiated.

For more information about the way the headset affects the anatomy of the airway and its openness at the level of the throat, see Cook and Strasser (2003).
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