Use of Non-Steroidal Anti-Inflammatory Drugs among Participants in a Mountain Ultramarathon Event A Spanish group has examined the use of painkillers on a mountain tramarathon and compared with runners over shorter routes.
It showed that on the longer distance on the one hand more painkillers were used than on the shorter routes and that the Ultralaufen was more all during the barrel. The very readable work can be found under https://www.mdpi.com/2075-4663/5/1/11