星期日, 12月 14, 2008

Pronation

I have been wondering what the heck is 'pronation'? The sales person in the running shoe outlets never explain well about this. The services of most outlets are desperately disappointing and they just concern about $ that can earn from you and push the stock out, sigh....

This material explains very well on type of pronations, normal/over/under pronation. It is important to observe your running style in order to choose the best shoe that fits you.

From the August 2004 issue of Runner's World

If you have a normal arch, you're likely a normal pronator, meaning you'll do best in a stability shoe that offers moderate pronation control. Runners with flat feet normally overpronate, so they do well in a motion-control shoe that controls pronation. High-arched runners typically underpronate, so they do best in a neutral-cushioned shoe that encourages a more natural foot motion.


Normal Pronation
The outside part of the heel makes initial contact with the ground. The foot "rolls" inward about fifteen percent, comes in complete contact with the ground, and can support your body weight without any problem. The rolling in of the foot optimally distributes the forces of impact. This movement is called "pronation," and it's critical to proper shock absorption. At the end of the gait cycle, you push off evenly from the front of the foot.

View Video


Overpronation
As with the "normal pronation" sequence, the outside of the heel makes the initial ground contact. However, the foot rolls inward more than the ideal fifteen percent, which is called "overpronation." This means the foot and ankle have problems stabilizing the body, and shock isn't absorbed as efficiently. At the end of the gait cycle, the front of the foot pushes off the ground using mainly the big toe and second toe, which then must do all the work.

View Video


Underpronation
Again, the outside of the heel makes initial contact with the ground. But the inward movement of the foot occurs at less than fifteen percent (i.e., there is less rolling in than for those with normal or flat feet). Consequently, forces of impact are concentrated on a smaller area of the foot (the outside part), and are not distributed as efficiently. In the push-off phase, most of the work is done by the smaller toes on the outside of the foot.

View Video

5 則留言:

Jason Yap 提到...

Well, I went to Adidas outlet in The Gardens, they have a footscan machine that can see yur pronation type.

blueameba 提到...

wow.. that's good, so did you bought the right shoe from there?

Jason Yap 提到...

I think I bought the most comfortable shoes i have ever worn. (Anyway, this is only my first running shoes, previously just wear Power shoes, paiseh). But i did try out several shoes that day and run several rounds in front of the shop. They dun hav a treadmill though. Customer service is also good and can explain based on footscan.

慧沁 Wai Sum 提到...

thanks a lot for the video and information, very useful! I did adidas footscan before, but not sure how accurate it could be. because I felt uncomfortable to run over the scanning machine, as I need to adjust my steps to left foot or right foot to allow them to scan them individually, so the foot prints look a bit unnatural to me....that's just my feeling lah, no harm trying!

blueameba 提到...

I went to Adidas The Garden before, but just window shopping, cause i know i wont be buying the shoe from there (expensive and no discount) I not very generous in spending, the most generous one which is the Brooks, but too bad that was a WRONG choice!

I used to go Adidas Warehouse Outlet at The Summit if I've any targeted shoe to buy, but need to depend on luck, it only has limited stock. The outlet keep off season shoes, so all shoe were 20%-30% off.