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Asymmetry in Determinants of Running Speed During Curved Sprinting

Kazuhiro Ishimura and Shinji Sakurai

This study investigates the potential asymmetries between inside and outside legs in determinants of curved running speed. To test these asymmetries, a deterministic model of curved running speed was constructed based on components of step length and frequency, including the distances and times of different step phases, takeoff speed and angle, velocities in different directions, and relative height of the runner’s center of gravity. Eighteen athletes sprinted 60 m on the curved path of a 400-m track; trials were recorded using a motion-capture system. The variables were calculated following the deterministic model. The average speeds were identical between the 2 sides; however, the step length and frequency were asymmetric. In straight sprinting, there is a trade-off relationship between the step length and frequency; however, such a trade-off relationship was not observed in each step of curved sprinting in this study. Asymmetric vertical velocity at takeoff resulted in an asymmetric flight distance and time. The runners changed the running direction significantly during the outside foot stance because of the asymmetric centripetal force. Moreover, the outside leg had a larger tangential force and shorter stance time. These asymmetries between legs indicated the outside leg plays an important role in curved sprinting.

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Hand Movements in Communicative and Noncommunicative Situations in Very Young Infants: A Preliminary Study

Eszter Somogyi, Laurent Salomon, and Jacqueline Fagard

Handedness and hemispheric dominance for language are the two most studied forms of asymmetry, and the relationships between the two have long been the focus of research for two reasons. The first is the high prevalence of left hemispheric dominance for both functional asymmetries, namely that 90

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Stepping to an Auditory Metronome Improves Weight-Bearing Symmetry in Poststroke Hemiparesis

Rachel L. Wright, Joseph W. Bevins, David Pratt, Catherine M. Sackley, and Alan M. Wing

Asymmetry in weight-bearing is a common feature in poststroke hemiparesis, with the nonparetic lower limb being favored during quiet standing. 1 , 2 This weight-bearing asymmetry remains in more dynamic tasks such as swaying, 3 standing up from a chair, 4 and walking, 5 , 6 and a reduced

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Offset Loading in a Bilateral Squatting Movement Pattern Influences Ground-Reaction Force and Muscle Activity in the Dominant and Nondominant Limb

Charlie R. Ottinger, James J. Tufano, Kristen C. Cochrane-Snyman, Raad H. Gheith, and Jeffrey M. McBride

motor tasks, can influence limb dominance as well as the magnitude of strength asymmetries between limbs. 8 Thus, others have designated dominance as the limb that attains better results in performance-related assessments. 8 In the strength and conditioning field, these definitions have led to

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Reactive Strength as a Metric for Informing Return-to-Sport Decisions: A Case-Control Study

Jorg Teichmann, Kim Hébert-Losier, Rachel Tan, Han Wei Lem, Shabana Khanum, Ananthi Subramaniam, Wee-Kian Yeo, Dietmar Schmidtbleicher, and Christopher M. Beaven

actions necessary to perform complex tasks. 8 As part of the return-to-sport decision process, a range of assessment tools are implemented clinically to determine muscular proficiency and coordination, including one-legged hop tests, 9 , 10 stepdown tests, 11 and associated measures of asymmetry. 12 A

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Are Unilateral Devices Valid for Power Output Determination in Cycling? Insights From the Favero Assioma Power Meter

Pedro L. Valenzuela, Almudena Montalvo-Perez, Lidia B. Alejo, Mario Castellanos, Jaime Gil-Cabrera, Eduardo Talavera, Alejandro Lucia, and David Barranco-Gil

, those power meters that are placed on the cranks or pedals allow measurement of the PO produced by each leg separately, which would enable the assessment of bilateral power asymmetry. Although these types of instruments can be acquired in bilateral versions, that is, with a sensor placed on each of the

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Profiling Single-Leg Balance by Leg Preference and Position in Rugby Union Athletes

Scott R. Brown, Matt Brughelli, and Seth Lenetsky

potential assessment tool in detecting lower-extremity asymmetries. Although many studies ( Gstöttner et al., 2009 ; Huurnink, Fransz, Kingma, Hupperets, & van Dieën, 2014 ; Riemann & Davies, 2013 ) have examined leg preference during balance tasks, none have assessed rugby athletes, and mixed results

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Handedness, Bilateral, and Interdigit Strength Asymmetries in Male Climbers

Cameron Hartley, Nicola Taylor, Joel Chidley, Jiří Baláš, and Dave Giles

of a fall. Indeed, asymmetries in the load application time for handiness have been demonstrated in climbers, for instance, the dominant hand has been shown to receive less relief time and longer work time when climbing. 5 Differences have also been reported in the oxygen kinetics of the dominant

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Relationship Between Muscle Strength Asymmetry and Body Sway in Older Adults

Hitoshi Koda, Yoshihiro Kai, Shin Murata, Hironori Osugi, Kunihiko Anami, Takahiko Fukumoto, and Hidetaka Imagita

Although the human body looks symmetric at first glance, the limbs have functional asymmetry, such as a dominant hand or leg ( Coren, Porac, & Duncan, 1979 ; Incel, Ceceli, Durukan, Erdem, & Yorgancioglu, 2002 ). Previous literature has defined laterality as “a side of the body being

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The Independent Relationship Between Leg Skeletal Muscle Mass Asymmetry and Gait Speed in Community-Dwelling Older Adults

Chiharu Iwasaka, Tsubasa Mitsutake, and Etsuo Horikawa

, any asymmetries between the left and right skeletal muscle mass are not reflected. Several previous studies have reported on the asymmetry of leg muscle strength. Leg muscle strength asymmetry is increased in older adults compared with young adults ( Perry, Carville, Smith, Rutherford, & Newham, 2007