%0 Journal Article %T Age of peak performance in 50-km ultramarathoners ¨C is it older than in marathoners? %A Beat Knechtle %A Pantelis Theodoros Nikolaidis %J Archive of "Open Access Journal of Sports Medicine". %D 2018 %R 10.2147/OAJSM.S154816 %X Despite the increasing popularity of 50-km ultramarathons during the last few years, only limited information is available regarding the trends in its performance and participation. The aim of the present study was to examine the age of peak running performance in female and male 50-km ultramarathoners using second-order nonlinear regression analyses %K master athlete %K running %K sex difference %K ultra-endurance %K aerobic capacity %K aging %K cardiorespiratory fitness %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5840300/