As
said earlier, shoes are built upon the premise that impact forces and
pronation are what cause injuries. Pronation, in particular has been
constructed as the bane of all runners.
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We have become inundated with
limiting pronation via motion control shoes. The central idea behind
pronation is that overpronating causes rotation of the lower leg(i.e.
ankle,tibia, knee) putting stress on the joints and therefore leading to
injuries.
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Running shoes are therefore designed to limit this pronation.
Essentially, running shoes are developed and designed to put the body
in "proper" alignment. But do we really need proper alignment?
This
paradigm on pronation relies on two main things: (1)over pronation
causes injuries and (2) running shoes can alter pronation.
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Looking
at the first premise, we can see several studies that do not show a
link between pronation and injuries. In an epidemiological study by Wen
et al. (1997), he found that lower extremitly alignment was not a major
risk factor for marathon runners. In another study by Wen et al. (1998),
this time a prospective study, he concluded that " Minor variations in
lower extremity alignment do not appear conclusively to be major risk
factors for overuse injuries in runners."
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Other studies have reached
similar conclusions. One by Nigg et al. (2000) showed that foot and
ankle movement did not predict injuries in a large group of runners.
If
foot movement/pronation does not predict injuries or is not a risk
factor for injuries, then one has to question whether the concept is
sound or working...
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