{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,26]],"date-time":"2025-12-26T11:25:35Z","timestamp":1766748335435,"version":"build-2065373602"},"reference-count":34,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2023,3,11]],"date-time":"2023-03-11T00:00:00Z","timestamp":1678492800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100008982","name":"QNRF","doi-asserted-by":"publisher","award":["NPRP 4-760-3-217"],"award-info":[{"award-number":["NPRP 4-760-3-217"]}],"id":[{"id":"10.13039\/100008982","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>This study examined the impact of custom foot orthoses made of ethyl-vinyl acetate (EVA) and expanded thermoplastic polyurethane (TPU) materials, both compared to a control condition (CON; shoes only), on mechanical asymmetries during repeated treadmill sprints. Eighteen well-trained male runners executed eight, 5-s sprints (rest: 25 s) on an instrumented motorized treadmill in three footwear conditions (EVA, TPU, and CON). We evaluated the group mean asymmetry scores using the \u2018symmetry angle\u2019 (SA) formula, which assigns a score of 0% for perfect symmetry and a score of 100% for perfect asymmetry. There was no condition (all p \u2265 0.053) or time (p \u2265 0.074) main effects, nor were there any significant time \u00d7 condition interactions on SA scores for any variables (p \u2265 0.640). Mean vertical, horizontal, and total forces presented mean SA values (pooled values for the three conditions) of 2.6 \u00b1 1.9%, 2.9 \u00b1 1.6%, and 2.4 \u00b1 1.8%, respectively. Mean SA scores were ~1\u20133% for contact time (1.5 \u00b1 0.5%), flight time (3.0 \u00b1 0.3%), step frequency (1.1 \u00b1 0.5%), step length (1.9 \u00b1 0.7%), vertical stiffness (2.1 \u00b1 0.9%), and leg stiffness (2.4 \u00b1 1.1%). Mean SA scores were ~2\u20136.5% for duration of braking (4.1 \u00b1 1.6%) and propulsive (2.4 \u00b1 1.0%) phases, and peak braking (6.2 \u00b1 2.9%) and propulsive (2.1 \u00b1 1.4%) forces. In well-trained runners facing intense fatigue, wearing custom foot orthoses did not modify the observed low-to-moderate natural stride mechanical asymmetries.<\/jats:p>","DOI":"10.3390\/sym15030705","type":"journal-article","created":{"date-parts":[[2023,3,13]],"date-time":"2023-03-13T06:09:56Z","timestamp":1678687796000},"page":"705","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["No Effect of EVA and TPU Custom Foot Orthoses on Mechanical Asymmetries during Acute Intense Fatigue"],"prefix":"10.3390","volume":"15","author":[{"given":"Ken","family":"Van Alsenoy","sequence":"first","affiliation":[{"name":"Aspetar Orthopaedic and Sports Medicine Hospital, Doha 23833, Qatar"},{"name":"Centre for Health, Activity and Rehabilitation Research (CHEAR), Queen Margaret University, Edinburgh EH21 6UU, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joong","family":"Ryu","sequence":"additional","affiliation":[{"name":"Sports Science Department, Aspire Academy, Doha 23153, Qatar"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4797-182X","authenticated-orcid":false,"given":"Olivier","family":"Girard","sequence":"additional","affiliation":[{"name":"Aspetar Orthopaedic and Sports Medicine Hospital, Doha 23833, Qatar"},{"name":"Exercise and Sport Science Department, School of Human Sciences, The University of Western Australia, Perth, WA 6009, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,3,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"36","DOI":"10.3389\/fspor.2019.00036","article-title":"Running velocity does not influence lower limb mechanical asymmetry","volume":"1","author":"Girard","year":"2019","journal-title":"Front. 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