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My perspective is from a person who has both an engineering and biological background.
This article says the NFL spent a whopping 115 grand. The NFL is a billion dollar making industry. An injury caused by turf can take out a player that an NFL team has millions of dollars invested into. It can knock a number 1 player out and cause his team to lose, and lead to a lesser team making the playoffs and hurting the NFL's ratings on TV. Bad ratings equals less monetary rights.
So I am thinking, that a hundred grand seems like too little. I also feel it was something that should have been researched decades ago.
All this current Boise test does is test the load on the shoes feet and the ankle joints. It doen't test for knee, connective tissue, and cartilage damage. Grass grown in soil, distributes force downward more evenly and has less of a bounce than turf. The kinetic energy is absorbed into the ground. This bounce from the turf means some energy is actually not distributed downward but actually back up through the feet and creates extra stress on parts of the body. This stress creates extra wear and tear as well as injuries.
You are basically increasing the pounds per square inch of force being returned to the body. Evolution has allowed bones, joints, and connective tissues to evolve over time based on normal wear and tear of normal people. Athletes in general, put extra wear and tear on their bones, joints, and connective tissues. This is more stress than evolution has prepared thebody for. The turf bounce increases the statistical chance of an injury as well as the pounds per square inch on an injury prone location on the body.
Make a slower surface, that has better kinetic energy absorbing turf, with less bounce, and you will reduce injury.
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