sami72
03-18-2008, 01:11 AM
Now that we have reviewed some of the basic shoe anatomy, let's move on to understanding some of those complicated words such as pronation and supination. During a normal heel-toe gait, the heel will strike on the outside edge and the weight is transferred across to the inside ball of the foot and big toe.
During pronation, the foot rolls inward at the ankle, the mid-foot bulges inward and the longitudinal arch flattens. Excessive pronation is the most common cause of all running injuries. Those who over-pronate generally have very flexible and unstable feet. This is most commonly seen in young teens who are growing far too quickly
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It is not uncommon for the long bones of the lower leg to grow 10 to 20 times faster, than the bones in the supporting ankle and foot. A quick look at any youngster's feet when pointed directly at you, will denote a pronation problem.
A supinated foot rolls outward at the ankle and has a very high arch. They tend to be more rigid and very poor in absorbing shock, so they need running shoes with a lot of cushioning. Cushion shoes tend to be poor at motion control.
Arches are another key factor in the foot. They may be flat, normal, or too high depending on your genetics. The arch is actually positioned by a yellow ligament (one of only two in your body) that makes up the longitudinal arch of the foot. It is possible to stimulate the arch to shorten and other times you may require surgery to physically shorten the ligament.
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During pronation, the foot rolls inward at the ankle, the mid-foot bulges inward and the longitudinal arch flattens. Excessive pronation is the most common cause of all running injuries. Those who over-pronate generally have very flexible and unstable feet. This is most commonly seen in young teens who are growing far too quickly
http://www.bodybuilding.com/fun/images/2007/drryan57_esm.jpg
It is not uncommon for the long bones of the lower leg to grow 10 to 20 times faster, than the bones in the supporting ankle and foot. A quick look at any youngster's feet when pointed directly at you, will denote a pronation problem.
A supinated foot rolls outward at the ankle and has a very high arch. They tend to be more rigid and very poor in absorbing shock, so they need running shoes with a lot of cushioning. Cushion shoes tend to be poor at motion control.
Arches are another key factor in the foot. They may be flat, normal, or too high depending on your genetics. The arch is actually positioned by a yellow ligament (one of only two in your body) that makes up the longitudinal arch of the foot. It is possible to stimulate the arch to shorten and other times you may require surgery to physically shorten the ligament.
for more click this link
http://www.bodybuilding.com/fun/drryan57.htm