Welcome! › Forums › Running Forum › What takes someone out in a marathon? + clarificatoins › Re: Re: What takes someone out in a marathon? + clarificatoins
Well, it's a little more complex than that. Obviously, if your LT pace is 5:30 per mile, you're not going to have much luck running a marathon at sub-5:00 pace. However, without writing a book, I think a reasonable simplification of the situation would be that muscle fatigue and low glycogen are generally the triggers for not being able to hold the pace. It gets more complicated largely when you try to explain what causes those things.