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We also examined the reasonable portion of the <jats:styled-content style=\"fixed-case\">AT<\/jats:styled-content> related to running performance among <jats:styled-content style=\"fixed-case\">AT<\/jats:styled-content> lengths measured in three different portions. The <jats:styled-content style=\"fixed-case\">AT<\/jats:styled-content> lengths at three portions and cross\u2010sectional area (<jats:styled-content style=\"fixed-case\">CSA<\/jats:styled-content>) of 30 endurance runners were measured using magnetic resonance imaging. Each <jats:styled-content style=\"fixed-case\">AT<\/jats:styled-content> length was calculated as the distance from the calcaneal tuberosity to the muscle\u2010tendon junction of the soleus, gastrocnemius medialis (<jats:styled-content style=\"fixed-case\">GM<jats:sub>AT<\/jats:sub><\/jats:styled-content>), and gastrocnemius lateralis, respectively. These <jats:styled-content style=\"fixed-case\">AT<\/jats:styled-content> lengths were normalized with shank length. The <jats:styled-content style=\"fixed-case\">AT CSA<\/jats:styled-content> was calculated as the average of 10, 20, and 30\u00a0mm above the distal insertion of the <jats:styled-content style=\"fixed-case\">AT<\/jats:styled-content> and normalized with body mass. Running economy was evaluated by measuring energy cost during three 4\u2010minutes submaximal treadmill running trials at 14, 16, and 18\u00a0km\/h, respectively. Among three <jats:styled-content style=\"fixed-case\">AT<\/jats:styled-content> lengths, only a <jats:styled-content style=\"fixed-case\">GM<jats:sub>AT<\/jats:sub><\/jats:styled-content> correlated significantly with personal best 5000\u2010m race time (<jats:italic>r<\/jats:italic>=\u2212.376, <jats:italic>P<\/jats:italic>=.046). Furthermore, <jats:styled-content style=\"fixed-case\">GM<jats:sub>AT<\/jats:sub><\/jats:styled-content> correlated significantly with energy cost during submaximal treadmill running trials at 14\u00a0km\/h and 18\u00a0km\/h (<jats:italic>r<\/jats:italic>=\u2212.446 and \u2212.429, respectively, <jats:italic>P<\/jats:italic>&lt;.05 for both), and a trend toward such significance was observed at 16\u00a0km\/h (<jats:italic>r<\/jats:italic>=\u2212.360, <jats:italic>P<\/jats:italic>=.050). In contrast, there was no correlation between <jats:styled-content style=\"fixed-case\">AT CSA<\/jats:styled-content> and running performance. These findings suggest that longer <jats:styled-content style=\"fixed-case\">AT<\/jats:styled-content>, especially <jats:styled-content style=\"fixed-case\">GM<jats:sub>AT<\/jats:sub><\/jats:styled-content>, may be advantageous to achieve superior running performance, with better running economy, in endurance runners.<\/jats:p>","DOI":"10.1111\/sms.12940","type":"journal-article","created":{"date-parts":[[2017,6,28]],"date-time":"2017-06-28T17:06:45Z","timestamp":1498669605000},"page":"446-451","source":"Crossref","is-referenced-by-count":29,"title":["Relationship between Achilles tendon length and running performance in well\u2010trained male endurance runners"],"prefix":"10.1111","volume":"28","author":[{"given":"Hiromasa","family":"Ueno","sequence":"first","affiliation":[{"name":"Faculty of Sport and Health Science Ritsumeikan University  Kusatsu Shiga 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