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Vikki Krane, Emma Calow, and Brandy Panunti

( Abdul, 2020 ). Shortly after that, a physician associated with World Athletics 1 told her she needed to undergo treatment, including surgery, to be eligible for future elite competition. Given the option of never competing again or undergoing the treatment, Negasa opted for the treatment. “I love my

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Michael J. Asmussen, Glen A. Lichtwark, and Jayishni N. Maharaj

Humans have the remarkable ability to run over variable terrains. During locomotion, however, humans are unstable in the mediolateral direction and this instability must be controlled actively—a goal that could be achieved in more ways than one. Walking research indicates that the subtalar joint absorbs energy in early stance and returns it in late stance, an attribute that is credited to the tibialis posterior muscle-tendon unit. The purpose of this study was to determine how humans (n = 11) adapt to mediolateral perturbations induced by custom-made 3D-printed “footwear” that either enhanced or reduced pronation of the subtalar joint (modeled as motion in 3 planes) while running (3 m/s). In all conditions, the subtalar joint absorbed energy (ie, negative mechanical work) in early stance followed by an immediate return of energy (ie, positive mechanical work) in late stance, demonstrating a “spring-like” behavior. These effects increased and decreased in footwear conditions that enhanced or reduced pronation (P ≤ .05), respectively. Of the recorded muscles, the tibialis posterior (P ≤ .05) appeared to actively change its activation in concert with the changes in joint energetics. We suggest that the “spring-like” behavior of the subtalar joint may be an inherent function that enables the lower limb to respond to mediolateral instabilities during running.

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Gennaro Boccia, Marco Cardinale, and Paolo Riccardo Brustio

elite senior athlete. In middle-distance events, only 31% of the junior finalists in the WJC had been ranked among the top 10 later at senior level. 10 We recently reported robust estimates of transition rate in world-class sprinters and jumpers. 7 , 11 After analyzing the World Athletics and WJC

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Gennaro Boccia, Marco Cardinale, and Paolo Riccardo Brustio

categories. Methods The sample of this study involved the sprinters competing in 100-, 200-, and 400-m races. The names of male and female athletes ranked in the top 100 official lists of the International Association of Athletics Federations (IAAF—now called World Athletics; https://www.iaaf.org/home ) in

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Ralph Beneke and Renate M. Leithäuser

This year’s International Association of Athletic Federations World Athletics Championship in Doha, Qatar, provides interesting challenges. Doha is in the desert. Most athletes will compete in a fully climatized stadium guaranteeing comfortable ambient temperatures. Starting times of the remaining

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Jennifer Sygo, Alicia Kendig Glass, Sophie C. Killer, and Trent Stellingwerff

break providing an opportunity for a more substantial meal. Including both sweet and savory options throughout the day can limit flavor fatigue. A review of the CE 2015 IAAF World Athletics Championships, including 12 CE athletes, reported that planned fluid intakes on competition day were greater than

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Steve H. Faulkner, Iris Broekhuijzen, Margherita Raccuglia, Maarten Hupperets, Simon G. Hodder, and George Havenith

.1002/cphy.c140051 10.1002/cphy.c140051 26756633 6. Périard JD , Racinais S , Timpka T , et al . Strategies and factors associated with preparing for competing in the heat: a cohort study at the 2015 IAAF World Athletics Championships . Br J Sports Med . 2017 ; 51 ( 4 ): 264 – 270 . PubMed ID

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Douglas J. Casa, Samuel N. Cheuvront, Stuart D. Galloway, and Susan M. Shirreffs

.-M. ( 2017 ). Strategies and factors associated with preparing for competing in the heat: A cohort study at the 2015 IAAF World Athletics Championships . British Journal of Sports Medicine, 51 ( 4 ), 264 – 270 . PubMed ID: 27815238 doi:10.1136/bjsports-2016-096579 10.1136/bjsports-2016-096579 Racinais

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Thomas Reeve, Ralph Gordon, Paul B. Laursen, Jason K.W. Lee, and Christopher J. Tyler

, Timpka T , et al . Strategies and factors associated with preparing for competing in the heat: a cohort study at the 2015 IAAF World Athletics Championships . Br J Sports Med . 2017 ; 51 ( 4 ): 264 – 270 . PubMed ID: 27815238 doi:10.1136/bjsports-2016-096579 10.1136/bjsports-2016-096579 6. Laursen

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Mitchell J. Henderson, Bryna C.R. Chrismas, Christopher J. Stevens, Aaron J. Coutts, and Lee Taylor

factors associated with preparing for competing in the heat: a cohort study at the 2015 IAAF World Athletics Championships . Br J Sports Med . 2017 ; 51 ( 4 ): 264 – 270 . PubMed ID: 27815238 doi:10.1136/bjsports-2016-096579 10.1136/bjsports-2016-096579 16. Thornton HR , Nelson AR , Delaney JA