Scaling in Athletic World Records
  World records in athletics provide a measure of physical as well as physiological human performance. Here we analyse running records and show that the mean speed as a function of race time can be described by two scaling laws that have a breakpoint at about 150-170 seconds (corresponding to the ~1,000 m race). We interpret this as being the transition time between anaerobic and aerobic energy expenditure by athletes. 
Sandra Savaglio (Space Telescope Science Institute, Baltimore, USA)   and Vincenzo Carbone (University of Calabria, Rende, I...