Hi there,
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I provided foot care at a 6 day ultramarathon recently (my first time). Runners were on a bitumen track a bit over 1km in length and shin pain was a common symptom. According to these runners, it seemed more of an issue at this event compared to others, the surface stiffness being blamed. There were two main areas of the shin that were sore:
a) tibilais anterior muscle belly
b) the lower 1/3 of the shin lateral to the tibial crest
(It was not MTSS or localised pain on the tibia and didn't seem to be compartment syndrome). I have read that tibialis anterior pain will be worse on a stiff surface as it has to work harder eccentrically.
Why is that?
Is it because on a compliant surface there is a tiny amount of forward slide and/or vertical surface compression which acts to decelerate ankle joint plantarflexion (assuming initial contact is heel strike), and therefore slightly lowers the eccentric load on tibialis anterior? Or is there something else?
Thanks for your help.
Rebecca
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Effect of shoe insole for prevention and treatment of lower extremity injuries
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