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Heel-shoe interactions and the durability of EVA foam running-shoe midsoles

PainSci » bibliography » Verdejo et al 2004
updated
Tags: running, biomechanics, IT band pain, patellar pain, plantar fasciitis, shin pain, devices, foot, exercise, self-treatment, treatment, etiology, pro, knee, leg, limbs, pain problems, overuse injury, injury, tendinosis, arthritis, aging

Five articles on PainSci cite Verdejo 2004: 1. Is Running on Pavement Risky?2. The Complete Guide to IT Band Syndrome3. The Complete Guide to Patellofemoral Pain Syndrome4. Complete Guide to Plantar Fasciitis5. Shin Splints Treatment, The Complete Guide

PainSci notes on Verdejo 2004:

Science news flash! Shoes wear out: “Scanning electron microscopy shows that structural damage (wrinkling of faces and some holes) occurred in the foam after 750 km run. Fatigue of the foam reduces heelstrike cushioning, and is a possible cause of running injuries.”

original abstract Abstracts here may not perfectly match originals, for a variety of technical and practical reasons. Some abstacts are truncated for my purposes here, if they are particularly long-winded and unhelpful. I occasionally add clarifying notes. And I make some minor corrections.

A finite element analysis (FEA) was made of the stress distribution in the heelpad and a running shoe midsole, using heelpad properties deduced from published force-deflection data, and measured foam properties. The heelpad has a lower initial shear modulus than the foam (100 vs. 1050 kPa), but a higher bulk modulus. The heelpad is more non-linear, with a higher Ogden strain energy function exponent than the foam (30 vs. 4). Measurements of plantar pressure distribution in running shoes confirmed the FEA. The peak plantar pressure increased on average by 100% after 500 km run. Scanning electron microscopy shows that structural damage (wrinkling of faces and some holes) occurred in the foam after 750 km run. Fatigue of the foam reduces heelstrike cushioning, and is a possible cause of running injuries.

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