[article] in Journal of the American Podiatric Medical Association > vol. 108, 6 (Novembre - décembre 2018) . - p. 449-457 Titre : | Effects of in-shoe midsole cushioning on leg muscle balance and co-contraction with increased heel height during walking | Type de document : | article de périodique | Auteurs : | Kit-Lun Yick, Auteur ; Ka-Lai Yeung, Auteur ; Yee-Nee Lam, Auteur ; Sun-Pui Ng, Auteur | Année de publication : | 2018 | Article en page(s) : | p. 449-457 | Langues : | Anglais (eng) | Descripteurs (mots clés) : | [Thésaurus Mesh]Chaussures [Thésaurus Mesh]Jambe [Thésaurus Mesh]Marche à pied [Thésaurus Mesh]Muscles [Thésaurus Mesh]Orthèses de pied [Thésaurus HELB]:Paramédical:amortissement
| Mots-clés : | walking shoes foot orthoses leg muscle | Résumé : | Background: The midsole is an essential assembly of footwear for retaining the shape of the shoe, delivering support to the foot, and serving as a cushioning and stability device for walking. To improve leg muscle balance and muscle co-contraction, we propose a new midsole design for high heels with different hardness levels at the forefoot region.
Methods: Five healthy women participated in the study, with a mean ± SD age of 21.80 ± 4.09 years, and duration of high-heeled shoe wear of 5.20 ± 4.09 years. Two midsole conditions, control and multiple-hardness midsole (MHM), with heel heights of 2 (flat), 5, and 8 cm were used. The main outcome measures were to examine the acute effects of MHM by electromyography on muscle activity balance and co-contraction at varying heel heights during shuttle walk.
Results: Use of the MHM significantly reduced the muscle activity ratio between the medial and lateral gastrocnemius muscles (P = .043) during push-off to heel strike with a heel height of 5 cm (−22.74%) and heel strike to midstance with a heel height of 8 cm (−22.26%). The increased co-contraction indices of the tibialis anterior–peroneus longus muscles (14.35% with an 8-cm heel height) and tibialis anterior–soleus muscles (15.18% with a 5-cm heel height) are significant (P = .043), with a large effect size (d = 0.8).
Conclusions: These results deliver important implications in advancing the engineering of MHM design without changing the in-shoe volume to enhance leg muscle balance and co-contraction during walking.
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