Does the weight of a running shoe affect its performance?

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shoewall Does the weight of a running shoe affect its performance? I found this article on the Barefoot Running Society boards that I believe would interest most runners. It has always been assumed that lighter shoes are better for running, or are they. Apparently, they are to a point, since cushioning and shock absorption and the ability to provide bounce helps us run better without using more energy. This year, Adidas came out with a line is shoes that were light, had a cushioning material that provided a huge amount of bounce with shock absorption with the idea that you can absorb shock better, while using less energy to run. You can read about their Boost technology here. To find out more about them, visit your local running sore. Runners High in both Metuchen and Freehold have these shoes and the material is quite impressive. Their personalized approach can help you get the shoes that are right for you. Check out the article here

Question: How much does shoe weight affect performance?

Dr. Jack Daniels: As a matter of fact I did the original research on shoe-weight factor, when I was working for Nike in the early 1980s and our research was presented at the World Congress of Sports Medicine in Vienna in the early 1980s. We found adding 100 grams to the shoe increased the aerobic demand of running by 1%. Now 100 grams is about 3.5274 ounces, so each ounce changes the cost of running about 0.2835% (1/3.5274= 0.2835). If you can run a mile in 5:40, that is going 284 meters per minute and that speed of running typically coasts about 55.55 ml O2 per Kg body weight per minute. 1 less ounce will change the cost to about 55.7075 (from 55.55 above) and that VO2 will be associated with a running speed of 284.7 m/min and a mile time of 5:39.17, so about .83 seconds for a mile, per ounce less weight.

NOW, that research involved running in the exact same pairs of shoes with little lead weights inserted into a sleeve sewed onto the sides of the shoe (at the point of center of mass of the shoe so it wouldn't change the toe or heel drop any). This allowed us to test WEIGHT ADJUSTMENT ONLY. When we tested the aerobic demand of different shoes of different weights, then we found a different story. Basically, as shoe weight went lighter the cost also dropped some, but when the shoe weight went too light, then the cost went up because there was getting to be less midsole cushioning and the runner's muscles had to start absorbing more landing shock and that costs more energy. It depends on the surface on which you are running. A nice soft artificial track will itself absorb some landing shock so the shoes don't need to do that for you, but on a street, you need some cushioning and that adds a little weight to the shoe, whereas reducing weight too far actually increases the cost of running, as does the material used in shoe design.

I hope this is simple enough. I think mentioning shoe design and midsole material is an important factor, and the most economical shoe we ever tested had a midsole over 1 inch think and was of a sponge material like you would wash your car with. Those shoes (we referred to as "marshmallow shoes") we're not so light, but absorbed so much landing shock that they were a joy to run in. Negative side of those was they did not prevent any pronation and if you did pronate, these shoes just exaggerated the problem — never produced (illegal anyway as they put your heel more than the allowable 20mm above the ground).
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