A 2026 commentary by eight researchers argues that a proposed change to where noseband tightness is measured — from the bridge of the nose to the side of the cheek — could systematically underestimate how tight a noseband actually is. Here's what the science says and what it means for riders and horses.

This 2025 study compared rein tension and bit pressure in horses  to known human pressure pain thresholds . The key finding: most commonly reported rein pressures in equestrian sport exceed the level at which humans would perceive pain , and higher ranges could reach levels associated with severe pain or even tissue damage. Only the lowest rein tensions would likely be pain-free if applied to a human face or hand. Bit pressure and rein tension are increasingly discussed in