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#1




Effect of weight on speed
Ive been running for 1.5 months. I run a few times a week almost 4 miles at
just about 9:15 min/mi pace. Im 46 and if I weighed what I should/could Id lose about 60 lbs. If I lost that much weight and assuming some improvement in fitness how fast can I go? 
#2




Effect of weight on speed
Howard wrote in
: Ive been running for 1.5 months. I run a few times a week almost 4 miles at just about 9:15 min/mi pace. Im 46 and if I weighed what I should/could Id lose about 60 lbs. If I lost that much weight and assuming some improvement in fitness how fast can I go? There was a lot of discussion on this a while ago on this newsgroup. Go to http://groups.google.com/ and enter "Effect of weight on speed". Or go he http://tinyurl.com/2bbgm Phil  If you can empty your own boat Crossing the river of the world, No one will oppose you, No one will seek to harm you. Chuang Tzu 
#3




Effect of weight on speed
In article , Howard wrote:
Ive been running for 1.5 months. I run a few times a week almost 4 miles at just about 9:15 min/mi pace. Im 46 and if I weighed what I should/could Id lose about 60 lbs. If I lost that much weight and assuming some improvement in fitness how fast can I go? Much faster. It's hard to say exactly, but I think you'd be reasonably fast, probably under 7 minutes a mile (and possibly faster than that) which is a respectable time for your age. Cheers,  Donovan Rebbechi http://pegasus.rutgers.edu/~elflord/ 
#4




Effect of weight on speed
Howard wrote:
Ive been running for 1.5 months. I run a few times a week almost 4 miles at just about 9:15 min/mi pace. Im 46 and if I weighed what I should/could Id lose about 60 lbs. If I lost that much weight and assuming some improvement in fitness how fast can I go? Every now and then I have seen a formula for such things like  how speed varies with weight,  how calories burned varies with weight and distance, and so forth. Haven't seen 'em for a while. Maybe someone here will repost.  Josh 
#5




Effect of weight on speed
"Phil M." wrote in
: Howard wrote in : Ive been running for 1.5 months. I run a few times a week almost 4 miles at just about 9:15 min/mi pace. Im 46 and if I weighed what I should/could Id lose about 60 lbs. If I lost that much weight and assuming some improvement in fitness how fast can I go? There was a lot of discussion on this a while ago on this newsgroup. Go to http://groups.google.com/ and enter "Effect of weight on speed". Or go he http://tinyurl.com/2bbgm Phil Here's some more information  http://www.vo2max.com.fr/parole/poids1.htm This site is in french. However, there are some graphs on the effects of losing a kilogram of body weight on your marathon, halfmarathon or 10K race performance Phil M.  "The great pleasure in life is doing what people say you cannot do." Walter Bagehot 
#6




Effect of weight on speed
In article , Josh Steinberg wrote:
Ive been running for 1.5 months. I run a few times a week almost 4 miles at just about 9:15 min/mi pace. Im 46 and if I weighed what I should/could Id lose about 60 lbs. If I lost that much weight and assuming some improvement in fitness how fast can I go? Every now and then I have seen a formula for such things like  how speed varies with weight,  how calories burned varies with weight and distance, and so forth. Haven't seen 'em for a while. Maybe someone here will repost. At the risk of causing further controversy, the exercise physiology community for the most part assume that the energy cost of running is linear as a function of bodyweight, and most models also assume that energy cost is directly proportional to speed. So for those who are interested in a rough rule of thumb for predicting gains that follow weight loss, as opposed to physics purists, the linear relationship between weight and time is "good enough". (not only that, but I've personally verified it over a 40lb weight loss) Cheers,  Donovan Rebbechi http://pegasus.rutgers.edu/~elflord/ 
#7




Effect of weight on speed
Donovan Rebbechi wrote in message ...
At the risk of causing further controversy, the exercise physiology community for the most part assume that the energy cost of running is linear as a function of bodyweight, and most models also assume that energy cost is directly proportional to speed. So for those who are interested in a rough rule of thumb for predicting gains that follow weight loss, as opposed to physics purists, the linear relationship between weight and time is "good enough". (not only that, but I've personally verified it over a 40lb weight loss) Lurker and occasional runner here. Two points: 1) I use a very very simple formula for running energy cost  simple for metric system: Energy cost (kcal) = mass (kg) * distance (km). Ex. 70 kg x 10 km = 700 kcal. It doesn't apply for uphill/downhill or trails, otherwise it should work quite well for an average runner. 2) Where you lose weight is important. Since you are not accelerating/decelerating your waist as much as your legs while running, losing fat there wouldn't improve your speed as much as predicted by the linear relationship. Probably losing let's say 10 % body weight would increase your speed by 58 % at the same fitness level (I don't remember the numbers I've read). Leo 
#8




Effect of weight on speed
In article , Leo wrote:
Lurker and occasional runner here. Two points: 1) I use a very very simple formula for running energy cost  simple for metric system: Energy cost (kcal) = mass (kg) * distance (km). Ex. 70 kg x 10 km = 700 kcal. It doesn't apply for uphill/downhill or trails, otherwise it should work quite well for an average runner. 2) Where you lose weight is important. Since you are not accelerating/decelerating your waist as much as your legs while running, losing fat there wouldn't improve your speed as much as predicted by the linear relationship. Probably losing let's say 10 % body weight would increase your speed by 58 % at the same fitness level (I don't remember the numbers I've read). It's worth observing that you can actually do *worse* than a linear prediction if weight is placed in the wrong area, so the linear model is *not* a worst case upper bound. Ankle and hand weights have been shown to reduce running economy, which means that they increase energy cost to a greater degree (much greater actually) than a proportional linear relationship between weight and energy cost would predict. Cheers,  Donovan Rebbechi http://pegasus.rutgers.edu/~elflord/ 
#9




Effect of weight on speed
The effect of weight on speed is devastating. Many of my runners take
off during the Winter and come back as much as 30 pounds heavier. With that extra weight they can't run worth a damn. I'm not even letting them run. I tell they need to diet and hike and lose most of the weight first because I strongly believe it is dangerous for them to even run like that. I see them jogging a 7 minute per mile pace for one mile and breathing harder then when they were running a 5 minute mile pace on a 10 mile run when they were lighter. I just had a discussion with someone on Monday who thinks that Brian Maxwell was somewhat overweight. If he was 30 pounds or more overweight and trying to run like he used to then I could see how someone could kill themselves doing so. Donovan Rebbechi wrote in message ... In article , Leo wrote: Lurker and occasional runner here. Two points: 1) I use a very very simple formula for running energy cost  simple for metric system: Energy cost (kcal) = mass (kg) * distance (km). Ex. 70 kg x 10 km = 700 kcal. It doesn't apply for uphill/downhill or trails, otherwise it should work quite well for an average runner. 2) Where you lose weight is important. Since you are not accelerating/decelerating your waist as much as your legs while running, losing fat there wouldn't improve your speed as much as predicted by the linear relationship. Probably losing let's say 10 % body weight would increase your speed by 58 % at the same fitness level (I don't remember the numbers I've read). It's worth observing that you can actually do *worse* than a linear prediction if weight is placed in the wrong area, so the linear model is *not* a worst case upper bound. Ankle and hand weights have been shown to reduce running economy, which means that they increase energy cost to a greater degree (much greater actually) than a proportional linear relationship between weight and energy cost would predict. Cheers, 
#10




Effect of weight on speed
They really put on 30 pounds over winter? how long is winter?
You keep spouting off about Maxwell being 30 pounds overweight. Yeah, he may weigh 30 lbs more than when he raced, but that does not make him overweight. I am 20+ pounds over my best racing weight, but far from being overweight. "macelroy" wrote in message om... The effect of weight on speed is devastating. Many of my runners take off during the Winter and come back as much as 30 pounds heavier. With that extra weight they can't run worth a damn. I'm not even letting them run. I tell they need to diet and hike and lose most of the weight first because I strongly believe it is dangerous for them to even run like that. I see them jogging a 7 minute per mile pace for one mile and breathing harder then when they were running a 5 minute mile pace on a 10 mile run when they were lighter. I just had a discussion with someone on Monday who thinks that Brian Maxwell was somewhat overweight. If he was 30 pounds or more overweight and trying to run like he used to then I could see how someone could kill themselves doing so. Donovan Rebbechi wrote in message ... In article , Leo wrote: Lurker and occasional runner here. Two points: 1) I use a very very simple formula for running energy cost  simple for metric system: Energy cost (kcal) = mass (kg) * distance (km). Ex. 70 kg x 10 km = 700 kcal. It doesn't apply for uphill/downhill or trails, otherwise it should work quite well for an average runner. 2) Where you lose weight is important. Since you are not accelerating/decelerating your waist as much as your legs while running, losing fat there wouldn't improve your speed as much as predicted by the linear relationship. Probably losing let's say 10 % body weight would increase your speed by 58 % at the same fitness level (I don't remember the numbers I've read). It's worth observing that you can actually do *worse* than a linear prediction if weight is placed in the wrong area, so the linear model is *not* a worst case upper bound. Ankle and hand weights have been shown to reduce running economy, which means that they increase energy cost to a greater degree (much greater actually) than a proportional linear relationship between weight and energy cost would predict. Cheers, 
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