We all know what it feels like to reach our limits—to be unable to maintain pace for even one more step. But what defines those limits? Turns out there are lots of different factors that kick in depending on the situation.
Researchers are still trying to sort out all these different factors, and a 2015 study in Medicine & Science in Sports & Exercise offers some interesting new insights. The study, from Kevin Thomas and his colleagues at Northumbria University in Britain, explores the relative contribution of the central nervous system compared to the muscles after different durations of all-out cycling.