Do you know your foot type? Published Sept. 10, 2007 By Capt. Lance Mabry 60th Surgical Operations Squadron TRAVIS AIR FORCE BASE, Calif. -- As the Air Force culture has shifted from cycle ergometry testing to the current "Fit to Fight" program, it is becoming more important for Airmen to understand the necessity to select the proper kind of running shoe for their specific foot type. here are three basic foot types: low arch (flat feet), normal arch and high arch. Each foot type has a different pattern of force application while walking. In fact, it has been theorized that having low arches or high arches can contribute to different types of injuries for the knee, ankle and foot. Knowing one's foot type that you have is important, as it can help assist in determining the type of shoes that are best. In order to determine what kind of foot they have, people can perform the wet foot test. To perform the test: -- Place a paper towel on the floor. -- Moisten the bottom of your foot. -- Stand normally on the paper towel. When looking at the footprint, if they have a very deep appearing instep that presents like a thin kidney bean, they likely have a high arch. If the footprint looks more ovular in shape, it is likely to be a low arch. If the footprint is in the middle, it is likely to be a normal arch. People with low arches should wear "motion control" running shoes. Those with normal arches should wear "stability" running shoes. Individuals with high arches should choose "cushioning" running shoes. Additionally, male runners weighing more than 180 pounds and female runners weighing more than 150 pounds need to select a running shoe that is built for a heavier runner. Selecting the proper running shoe may reduce the chances of sustaining an injury. It is also important to know when to replace your running shoes. It has been shown that running shoes lose 30 to 50 percent of their shock absorption after 250 miles and that wet running shoes lose 40 to 50 percent of their shock absorption. Therefore, it is recommended for runners to have two pair of running shoes to alternate after every use. Furthermore, they should replace your running shoes every 400 to 600 miles, every three to six months, or when you are visibly able to see the signs of wear. Lastly, it has been shown that running shoes have a shelf life of one to two years, after which they begin to lose their shock absorption. Therefore, it may be best to avoid purchasing last year's shoes that are on sale at discount prices. If you have any questions, contact the 60th Medical Group's Physical Therapy department at 423-7899.