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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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Wing-Chun V. Yeung, Chris Bishop, Anthony N. Turner, and Sean J. Maloney

[0.88] y) soccer players. The authors reported that all 3 loading conditions improved fastest (1.31%–1.58%) and total (1.89%–1.98%) CODS times compared with an unloaded control with no difference between loadings. Currently, the relationship between asymmetry and athletic performance is not clear. 16

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Matheus Barbalho, Ana Francisca Rozin Kleiner, Bianca Callegari, Ramon Costa de Lima, Givago da Silva Souza, Anselmo de Athayde Costa e Silva, and Victor Silveira Coswig

force applied against a load. 2 With that said, jump performance has been widely applied for the evaluation of muscle strength, power, and interlimb asymmetries, 3 , 4 being well related to athletic performance, 5 , 6 injury risk, 7 and common motor gestures of several sports, 8 including soccer

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Janina M. Prado-Rico and Marcos Duarte

the asymmetry of upright standing. For Borelli ( 1989 ), “standing alternately on one foot with the other loaded vertically is less fatiguing than standing on both feet simultaneously.” For Vierordt ( 1864 ), “body fluctuations are much lower when asymmetrically standing.” Hellebrandt ( Hellebrandt

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Paul J. Read, Jon L. Oliver, Gregory D. Myer, Mark B.A. De Ste Croix, and Rhodri S. Lloyd

disruptions in motor control strategies underlie these periods of increased injury risk ( 2 , 30 , 38 ). Between-limb asymmetry in functional performance is a potential risk factor for male youth soccer players where preferred lower limb dominance is evident ( 11 ). This may be further confounded by

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Silvia Cabral, Renan A. Resende, Adam C. Clansey, Kevin J. Deluzio, W. Scott Selbie, and António P. Veloso

High levels of gait asymmetry are associated with many pathologies. Our long-term goal is to improve gait symmetry through real-time biofeedback of a symmetry index. Symmetry is often reported as a single metric or a collective signature of multiple discrete measures. While this is useful for assessment, incorporating multiple feedback metrics presents too much information for most subjects to use as visual feedback for gait retraining. The aim of this article was to develop a global gait asymmetry (GGA) score that could be used as a biofeedback metric for gait retraining and to test the effectiveness of the GGA for classifying artificially-induced asymmetry. Eighteen participants (11 males; age 26.9 y [SD = 7.7]; height 1.8 m [SD = 0.1]; body mass 72.7 kg [SD = 8.9]) walked on a treadmill in 3 symmetry conditions, induced by wearing custom-made sandals: a symmetric condition (identical sandals) and 2 asymmetric conditions (different sandals). The GGA score was calculated, based on several joint angles, and compared between conditions. Significant differences were found among all conditions (P < .001), meaning that the GGA score is sensitive to different levels of asymmetry, and may be useful for rehabilitation and assessment.

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Harsh H. Buddhadev, Daniel L. Crisafulli, David N. Suprak, and Jun G. San Juan

asymmetry in power output has been observed in individuals with unilateral anterior cruciate ligament (ACL) deficiency during cycling. When pedaling at a fixed intensity, the normal ACL-intact limb increased its output by 44% to 50% to compensate for the reduced effort by the ACL-deficient leg. 11 Similar

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Katherine A.J. Daniels, Eleanor Drake, Enda King, and Siobhán Strike

months after surgery, during which most athletes return to sport, 7 asymmetries in kinematic and kinetic variables related to deficits on the operated limb have been noted during cutting maneuvers 8 , 9 as well as other jumping and landing tasks. 10 – 14 Objective assessment of these asymmetries may