Horsetalk.co.nz Risk factors for lung bleeding in jumps racing horses explored Share Increased time in training significantly increases the chances of jumps horses experiencing lung bleeding, researchers find. Photo by JasonTromm Increased time in training has been linked to a higher risk of bleeding in the lungs among jumps racing horses in Britain. The study by Royal Veterinary College researchers Tegan McGilvray and Jacqueline Cardwell centred on 177 racehorses in training for National Hunt races (steeplechase and hurdle events). Bleeding into the lungs, formally known as exercise-induced pulmonary haemorrhage (EIPH) is an important condition in horses who perform high-intensity exercise.