Participation Trends of Ultra Endurance Events The German researcher Volker Scheer from Paderborn has studied the existing literature on ultra events (competitions over 6 hours and longer) for running, swimming, cycling, cross-country skiing and triathlon. It shows that the number of participants has increased exponentially over the past 25 years.This increase is returned to the number of women and the older athletes. The article can be found under https://pubmed.ncbi.nlm.nih.gov/30601393/