a coach told me that if you lose 10lbs you will decrease your 100m by 1 sec. This was supposed to have been determined in the 80's i was wondering if someone knows where I could find the information that "supports" this
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Wight loss and performance in sprints?
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Re: Wight loss and performance in sprints?
Pretty sure you won't find any substantiation of that claim. Think of the physical limits involved. If you lost too much weight, you won't have muscle to run fast anymore. If someone weighs 300lbs and drops to 290lbs, are they gonna drop a second on their hundred? No, if they run far enough, they might drop dead from a heart attack.
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Re: Wight loss and performance in sprints?
Runner's World often cited a 2 second per pound per mile rule for distance running. Peter Coe (Better Training for Distance Runners) has a metric formula, but I have never bothered to see if the same relationship is predicted (as the RW formula). Of course, this is not what you were looking for anyway...
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Re: Wight loss and performance in sprints?
> the point was to make sure his claim was false
So what, exactly, was his claim?
Was it that the formula of 1 second per 10 pounds of body weight dropped applied universally to everyone?
Or was he referring to a specific athlete at a specific time (say, early season and the sprinter is out of shape and overweight)?
The first is obviously farcical, while the second appears to be entirely reasonable.
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Re: Wight loss and performance in sprints?
we have discussed this IAAF BB before.
simple physics tells you that if you have a loss in wt.,but same power output, you will become quicker (sensible parameters)
consider a 75kg guy who runs 10s. his average power output for that race = energy/sec is
0.5*m*v^2 = 0.5* 75* (100/10)^2 = 3750 W
(compare this to a fan-heater)
now, consider he loses 1kg in wt., but crucially, maintains same power output
then
3750 = 0.5* 74* v^2
where v turns out to be 10.06m/s & his 100m time becomes
9.93s
therefore, roughly for peak athletes, a drop in wt. of 1 lb would make them 0.03 - 0.04s quicker, with the all important proviso, that the loss in wt. is not a loss in muscle & therefore power.
the trouble is with this, is that the top guys are so finely tuned & at their peak, it is virtually impossible for them to lose any wt. & still maintain the power
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