For each 5 pounds one is over his normal racing weight, how many seconds per mile can he expect to lose in a 5k? And how much time in the 100 meters can he expect to lose?
For each 5 pounds one is over his normal racing weight, how many seconds per mile can he expect to lose in a 5k? And how much time in the 100 meters can he expect to lose?
Just guessing, but a couple of seconds per mile for a 5k and maybe half a second for 100m?
maybe instead of 5lbs each additional 3%
I did not realize it made that much difference.
Assuming the extra weight is fat not muscle, it makes
a big difference - I would guess that 5 pounds of
unnecessary weight costs more than a few seconds per mile,
especially in a longer race, but I don't have any hard
data.
Keep in mind though that everyone has an ideal racing
weight and at some point if your weight gets too low
you will start going slower, not faster.
The first 5 pounds will slow you down less than will the next five pounds. The next five pounds after that will slow you even a bit more, and so on. The principle would be the same as if you said, if I were running 15:37 for 5k (5:00 per mile) but speed up 5 seconds per lap how long could I last? Going 5 seconds per lap faster would mean you'd have to cut your run short by 7 minutes. 10 seconds a lap faster would mean you'd have to cut your run short by 11 minutes. 15 seconds per lap faster would mean you'd have to cut your run short by 14 minuts.
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Who would suffer more, the 5k runner or the 100m guy? I mean who would lose more time proportion to their distance?
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