ArticleEquine veterinary journal2026
Inspiratory and expiratory tracheal pressures during high-intensity exercise in harness racehorses.
Article in Equine veterinary journal, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors.
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Abstract
backgroundExercise-related upper respiratory tract (URT) disorders are common in racehorses. Objective assessment of URT mechanics is essential to quantify degrees of obstruction caused by URT disorders identified upon dynamic endoscopy.
objectivesTo establish reference values for inspiratory and expiratory tracheal pressures (cmH STUDY
designProspective observational study.
methodsTracheal pressures were measured in harness racehorses (Standardbreds and Norwegian-Swedish coldblooded trotters) in which no URT abnormalities were detected. Peak inspiratory and expiratory tracheal pressures were determined for each minute (phase) of a standardised treadmill test, which alternated between trotting with free head carriage (phases 1, 3, 5 and 7) and with poll flexion (phases 2, 4 and 6). Linear mixed-effects models assessed changes in tracheal pressures across the exercise test, and effects of breed, racing experience, respiratory rate and head-neck position (free vs. poll flexion).
resultsSeventy-six horses were included. Mean (SD) peak inspiratory tracheal pressures ranged from -21.8 (5.0) cmH MAIN LIMITATIONS: Simultaneous airflow measurements were not performed.
conclusionsInspiratory pressures became more negative with exercise progression and were significantly lower during poll flexion versus free head carriage. Reference values for tracheal pressures from clinically normal horses provide an objective tool for evaluating URT function during exercise.
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