Does Probiotic Supplementation Prevent Kidney Injury During Strenuous Physical Exercise?

Participants registered to run in organised half-marathons, marathons and ultramarathons in Southern Sweden will be recruited. They will be asked to abstain from probiotic supplementation (including functional foods with probiotics) for 2 weeks, and then commence a 4-week period of probiotic or placebo supplementation. At the end of the 4 week treatment period, the participants run the race. Urine samples are taken before and after the race and analysed for kidney injury markers. Stool samples are taken by participants at the initiation of the treatment period, last stool before the race, and first stool after the race.