A recent study, “Noseband Type and Tightness Level Affect Pressure on the Horse's Face at Trot,” has shed light on the effects of different noseband types and tightness levels on the pressure exerted on horses during trotting. The research involved eight high-level dressage horses and compared the pressures exerted on the nasal bone and mandibular rami using four different noseband types (Cavesson, Swedish, Flash, Drop) at various tightness levels ranging from 2.0 to 0.0 fingers. The results showed that pressures increased significantly with tighter nosebands, but no significant difference was found between 1.5 and 2.0 finger tightness levels. However, the small size of the study makes it premature to draw definitive conclusions. 

In light of these results, we (International Society for Equitation Science) emphasise the importance of caution in interpreting non-significant findings from small studies. We applaud the FEI (Fédération Equestre Internationale) for their continued commitment to the precautionary principle in ensuring equine welfare despite the findings of this and other related studies.

The study noted that pressures increased significantly at tightness levels below 1.5 fingers, raising concerns about potential risks to equine comfort and well-being. However, the study did not assess behavioural or physiological impacts.

This study provides valuable insights into the relationship between noseband design and tightness, but with its limited scope, caution is advised in drawing broad conclusions. Future research is encouraged to explore the behavioural and physiological responses to noseband pressures, ensuring evidence-based practices for the equestrian community.

You can find the research here.