Pharyngeal diameter in various head and neck positions during exercise in sport horses.

Summary

# Editorial Summary Dynamic upper airway obstructions remain a significant performance limitation in sport horses, yet the precise mechanisms linking head and neck position to pharyngeal function during exercise remain poorly understood. Go, Barton, and Ohnesorge developed a novel methodology to measure pharyngeal diameter in exercising horses across various head and neck positions, recognising that the pharynx—uniquely unsupported by bone or cartilage—is particularly vulnerable to pressure and flow changes during work. Their measurements revealed that head and neck flexion significantly reduced pharyngeal diameter during exercise, with implications for both performance and upper respiratory disease manifestation. These findings suggest that excessive flexion, particularly common in certain disciplines and training methods, may mechanically compromise airway patency and warrant reconsideration of ridden position protocols in horses with respiratory noise or underperformance. For practitioners, this work provides evidence-based justification for evaluating head and neck carriage as part of diagnostic investigation into dynamic airway obstruction, and highlights the need for position-specific assessment when investigating respiratory complaints in athletic horses.

Read the full abstract on PubMed

Key Findings

• •Pharyngeal diameter changes with different head and neck positions during exercise in sport horses
• •Head and neck flexion influences upper airway morphology and function
• •The pharynx is susceptible to pressure and airflow changes due to lack of osseous or cartilaginous support

Conditions Studied