Steve McDonald said:
From my own experience and observations, the opposite seems true.
I believe you need to develop footspeed as early in life as possible,
because it's much harder to do so, after you're older. If you build a
base of good sprinting speed in your youth, it's easier to slowly add
endurance and longer distance capabilities, as you mature. If you can
Good point. In fact most top distance runners who competed in high school
actually ran much shorter distances at that time. For example, Alan Culpepper
was an 800m/1500m runner.
Quoted message said:sprint faster, it's easier to run at a certain pace, as it is a lower
percentage of your top speed.
Well, no. It's not that simple. Better running economy translates to both faster
sprint speed *and* better performance. Running economy is the underlying
mechanism driving both. Most of the factors driving sprint speed are not going
to improve endurance. Motor learning is more important for young runners than
building mitochondria or aerobic capacity (these both can be deferred)
Quoted message said:Of course, you must have some inborn endurance strength, to carry
out this approach
successfully.
But even then, bulk up or do a lot of strength oriented exercise, and your
sprint speed will improve, while distance performance drops.
Quoted message said:Those with mostly fast-twitch muscle cells, won't become
great distance runners, regardless of their type of training. However,
a third kind of cell can be shifted between fast and slow-twitch
functions, with extensive training in either sprinting or distance.
If you're an adult and not in good running shape, obviously you
have to build overall conditioning by using a slow pace, for some time.
Only after you've built up some running ability, can you safely do hard
sprints, without risking injuries.
Champion distance runners, at the speeds they go nowadays, are
usually the ones who can sprint the fastest, as well as have great
endurance.
If that were true, the fastest marathoners would also be the fastest 100m
runners, or at least the 800m and 1500m runners (800m and 1500m have very good
aerobic fitness, and are faster than marathoners, so why isn't El G winning
marathons ? How many marathons will he win in his lifetime ?).
The reason the top 10k specialists are better sprinters than slower 10k
specialists has little to do with causal links between sprinting. If you
were to plot the pace one can run as a function of time, you would get a
different profile of each runner.
Now if you try to fit these curves, for the broad class of "distance runners",
you already get a very good fit with one parameter -- "level of fitness", like
the Daniels vdot, which doesn't account for individual variability in profile.
In particular, a miler will have a curve that crosses a marathoners curve (that
is why Culpepper and Meb aren't the fastest milers in the US)
But one could account for individual variability by including a decay rate in
the model. Now I suspect that specialists for any given distance will have
similar decay rates, because decay rate will be what determines which event
one specialises in.
In other words, the reason that the fastest 10k runners are the ones who can
sprint the fastest, is that these runners all have similar aerobic profiles
(parallel curves), so if you rank order any part of the curve, you also get a
rank orering on all other parts of the curve. It has nothing to do with causal
links between sprinting and distance performance -- it's just an artifact of
the fact that the guys in any given even have similar performance profiles.
Cheers,
--
Donovan Rebbechi
http://pegasus.rutgers.edu/~elflord/