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Okay, I'll bite. I've been following this thread for awhile now and i think it is actually a pretty healthy discussion. I'm glad the mods haven't taken it down. Side note: the founder of this site, Rojo was also my college coach btw and until about 2 years ago I was pretty much on here everyday.
However, the first 2 sentences of the above quote was totally out-of-line. Shame on you if you're a "fellow" ultra runner!
There seems to be a lot of "us" vs "them" attitudes and egos here. As someone who has seen some of both sides of the track/road and ultra/trail/mountain worlds it is surprising how there is such a disconnect. To me it's all just running (although of course i haven't done any 100milers or crazy steep/technical ultras which would require powerhiking/climbing..). I've raced a bit from 400m up to 100km and these all hurt. Sure the pain is different, but if one pushes themselves to the limit and fights the good fight then that should be respected.
Sure, aerobic fitness and Vo2max and Lactate Threshold help with Ultra-Trail-Mountain running (and yes there is even a disconnect between those 3 events...I've learned), but fat burning and glycogen storage come into play. As the distance increases the unknowns factor in more and more (ie getting dehydrated or even getting lost and running off course). That being said I've also learned that the race should not be defined by the mere distance as the elevation change, the terrain, the course markings, the number of aid stations and the weather can have a huge impact on the outcome of what looks to be a straightforward race on paper.
For example, take the Mt. Washington hill climb. It is only 7.6 miles long. Going into that race I had no idea what to expect. Running uphill (even on a smooth road) at 12% incline is a very specific task. I have no doubt that Max King has a waaay higher Vo2max than I do (heck he can run a 3k steeple almost as fast as my flat 3k)...but his best there is 1:02. For some reason (probably biomechanically as I am bad at downhill running.. that grade seems to work well for my body and I can be efficient on that slope). Several fairly fast road and track runners have no run up to their expectations on that hill..it is a climbing race.
So we can take that concept of % grade on the hills and see how it is hard to predict. Now look at variables like how the terrain is (ie steps, rocks, mud, grass, etc), but also when the hills take place in the race and how long they each are.
Bottom line. You have to be mentally tough and push yourself in any race distance. I grew up in the backwoods of Oregon running in the forest and so of course I enjoy trail running and mountains/scenery (i think it is basic human nature to enjoy the outdoors and running with a good view). But I also enjoy road racing marathons and value and respect the raw speed of the track. I'm in a position right now (mostly just due to my age) where I can still relate to the college cross country/track scene, the road racing scene and the ultra scene as i meet people who are invovled in all these aspects of running.
Best of luck with your training and racing,
Sage