Running is a great fitness and weight loss, but how many know the riders, which can often result in chronic injuries. Shoe companies are constantly marketing their latest findings in the comfort of light shoes, against the effect of reducing pronation and energy conservation. Grid systems, air bags, smart chips and step their way into our monitors all running shoes. Everyone seems happy as a holder of large amounts of confidence for the shoes and the fact that the shoe company has made a detailed analysis, and offers a product that can improve performance, reduce the chances that the actual injury or even solve our current injury problems. This article in the Daily Mail http://www. BBC. co. uk/home/moslive/article-1170253/The-painful-truth-trainers-Are-expensive-running-shoes-waste-money. HTML is an excerpt from a new book by Christopher McDougall on injury prevention, running shoes and their demands and led to our current topic. We decided to test video analysis to influence how pronation shoes. We will show how to measure rearfoot pronation with his video camera. This measure is often used in the specialty running shoe store to help customers in choosing the right anti-pronation running shoes. We show as is, and measure pronation of an athlete running barefoot and with track shoes. The foot pronation occurs when the arch collapses and the foot turns outward. Caused by high forces, over pronation of the foot may require that is often associated with running injuries. Supination is the opposite of pronation, and occurs when the foot inward. To correct this film, we had to use a treadmill. It would be very difficult to obtain a coherent view of the foot and leg, if the athlete was running away from us, and farther with each step. With the theme on a treadmill, we can amend our camera on a tripod position and know that we are consistently good view of the foot which we need for our analysis. You will notice that the camera is set directly behind the subject and in accordance with the right foot. For this analysis we focus only on the right foot, and therefore made sure that we are as straight as possible in view of the right leg when he was on the tape (whether it is through how we are measuring the oscillation pronation of the foot in position). Another important factor is speed. We can only really compare the pronation angle between the two videos, if we ensure that the subject is running at the same speed in both videos. With a tape that is how we determine the running speed. In this case, the subject is running at 6 miles per hour in each study. Let’s look at the details of these videos, for some pictures and the comparison of pronation angle in each of the three events. You could do a better job of educating pronation angle by comparing the changing function of time in position (feet on the ground to do) phase, but we want a simple analysis for the present and the best way is to collect 2 common time points. That’s why we are the angle of pronation in the foot strike first and midstance compared (after half of the feet) above the stage floor. To make a proper comparison of the different dates or events, it is always best to digitize points. Scanning is done through the identification of anatomical points on the subject, as the bottom of the heel or the tip of the Achilles tendon. There are several expensive systems that use reflective markers to identify automatically. For our comparison, we have a relatively inexpensive software called MaxTRAQ 2D, developed by our friends Innovision Systems, Inc. and manually scanned the points necessary to rearfoot pronation angle to be calculated. The runner goes barefoot shows no difference in the angle between the strike and pronation of the foot, the average position. 178th angles are measured from 6 to 178 7 degrees. A measure of 180 degrees to suggest that pronation or supination of the foot does not have, so 178th 6 1. Sample 4 degrees of supination (the opposite of pronation), which can be ignored. An angle greater than 180 degrees showing pronation. Then we ask our riders in their shoes, and once again measure the angle of pronation in the celebration of two events. We can immediately see that what our riders supination a little more on your attitude if it is running wearing shoes than when barefoot. At the foot of the angle of attack pronantion 166th 1 or 13 degrees. 9 degrees supination. In midfield has his foot in a nearly neutral position shows only Vienna 4 1 degrees of supination. Our brokers would be neutral, both in shoes and barefoot. Our running shoes are neutral, ie they do not provide support for the pro-or supination. View supination of about 14 degrees in the heel is relatively small and can not see who can down the corridor of the shoe heel, do not understand the position of the feet correctly and may, in another position within the shoe (probably) closer to neutral . If we have correctly calculated the position of the heel, and is more supination when walking in shoes, boots on the topic seems a high degree of damping, which allows convenient in a country where something unnatural position. Walking barefoot can be painful and therefore controls the runner up in the muscles and ligaments around the foot. This way you can avoid pain and injury during delivery. There are no great differences in our experiments, however, and our runners did not run too much pronation or supination during stance phase. Not everyone Bikel Abebe (1960 Olympic marathon winner walked barefoot), and we believe the shoe is more than likely prevented many more injuries he has caused. After buying now know how to analyze the rearfoot pronation, the next pair of running shoes with confidence and understanding. To learn more about the software used to digitize these tests, please e-mail and check out http://videosportsanalysis. blogspot. com.
Dudley Tabakin is co-founder of Sadaka, http://videosportsanalysis LLC. blogspot. com, a motion capture and biomechanics consultancy. Its customers include FootJoy, Titleist, Warrior Hockey, Vicon Motion Systems, Innovision Systems, Inc. and other sports and motion capture software company, and Biomechanics