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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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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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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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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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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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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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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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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

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Victor Spiandor Beretta, Fabio Augusto Barbieri, Diego Orcioli-Silva, Paulo Cezar Rocha dos Santos, Lucas Simieli, Rodrigo Vitório, and Lilian Teresa Bucken Gobbi

theoretical possibility is that, for some reason, one substantia nigra is more vulnerable than the other, and once the degenerative process starts, accelerated cell death occurs first on that side (see Djaldetti et al., 2006 for more details). The unilateral signs/symptoms of disease cause asymmetry in the

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Hanatsu Nagano, Rezaul K. Begg, William A. Sparrow, and Simon Taylor

Although lower limb strength becomes asymmetrical with age, past studies of aging effects on gait biomechanics have usually analyzed only one limb. This experiment measured how aging and treadmill surface influenced both dominant and nondominant step parameters in older (mean 74.0 y) and young participants (mean 21.9 y). Step-cycle parameters were obtained from 3-dimensional position/time data during preferred-speed walking for 40 trials along a 10 m walkway and for 10 minutes of treadmill walking. Walking speed (young 1.23 m/s, older 1.24 m/s) and step velocity for the two age groups were similar in overground walking but older adults showed significantly slower walking speed (young 1.26 m/s, older 1.05 m/s) and step velocity on the treadmill due to reduced step length and prolonged step time. Older adults had shorter step length than young adults and both groups reduced step length on the treadmill. Step velocity and length of older adults’ dominant limb was asymmetrically larger. Older adults increased the proportion of double support in step time when treadmill walking. This adaptation combined with reduced step velocity and length may preserve balance. The results suggest that bilateral analyses should be employed to accurately describe asymmetric features of gait especially for older adults.