|Running hard in a half marathon in 2009|
I got back from a trip to Eugene, Oregon this weekend for the half marathon there as part of my Western States build up. So, apart from the fact that I enjoy road racing and that Eugene is Track Town USA (with the US Olympic Trials occurring around WS time), why is that a good training run for a mountainous trail ultra?
One thing that I have found over time is that the more I just run trails, the more I tend to slow down. Yes, the ability to climb and descend gets better, but the pace on easier trails goes down. And WS, like most trail ultras, has a lot of faster running in there as well as some climbs to slow things down a bit.
Apart from downhill, most people are unlikely to hit their half marathon road speed in a trail ultra, but by working on the uncomfortable pace close to your lactate threshold (as a half marathon does), you force your body to adapt and be able to sustain a higher pace when on long runs. Your lactate threshold is basically the exercise intensity where lactic acid starts to accumulate in the blood, when lactate is produced faster than it can be removed. Effectively, this causes a runner to slow down so the higher this boundary can be pushed, the higher his or her sustainable pace becomes.
If you can make 6-minute/miles feel easier (or 7s, 9s, 11s etc) at the high end then it really helps to make cruising speed more efficient too in a really long run.
So why is a half marathon particularly good for this type of training? There are two main reasons I'd suggest for this:
1. Half marathon pace is fast enough to get close to your lactate threshold and push that boundary out so you can run faster, plus it is a long enough race that you have to push hard for a sustained period.
2. It's short enough that it doesn't take too long to recover from for a regular runner, certainly less time than a marathon.
Admittedly, guys with incredibly fast sub 2:20 marathon times haven't generally done as well in 100 milers as their speed would suggest. But it's the combination of the flat out speed and trail fitness that counts. Put a Kenyan Olympian on a mountainous 100-miler without specific training and they'd obviously not be bad, but they wouldn't automatically be the best unless they trained well for and adapted extremely well to the specifics of a mountain ultra (the same applies in the other direction but is more obvious to people and has been more tried and tested).
Speed training can be done on trails and hill work is similar in many ways, but if you like roads then they can really help as part of trail ultra training.