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Brice Guignard, Annie Rouard, Didier Chollet, Marco Bonifazi, Dario Dalla Vedova, John Hart and Ludovic Seifert

, were used to investigate human coordination dynamics during walking or running ( Donker, Beek, Wagenaar, & Mulder, 2001 ; O’Halloran, Hamill, McDermott, Remelius, & Van Emmerik, 2012 ; Wannier, Bastiaanse, Colombo, & Dietz, 2001 ). Coordination of the upper and lower limbs oscillators (i

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Janie L. Kelly and Alison R. Valier

make up anywhere from 20% to 65% of injuries. Furthermore, approximately 70% of overuse injuries in high school and college athletes occurred in the lower-extremity. 1 Lower limb overuse injuries (LLOIs) can occur anywhere in the lower-extremity, spanning from the feet to the thighs. 2 Medial tibial

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Mariam A. Ameer and Qassim I. Muaidi

response of the subject identical to the real environment by the effect of visual and auditory stimulus. The main objective of this study was to analyze the effect of ASS on the lower limb RT among young females. Methods Subjects A total of 60 healthy female university students volunteered for this study

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Ben Langley, Mary Cramp and Stewart C. Morrison

sagittal and transverse plane motions of the foot or upon more proximal joints. The assessment of how footwear influences lower limb kinematics may help to elucidate mechanisms by which injury risk can be mitigated, as hip and knee joint kinematics have been linked to the development of overuse running

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Charlie Bowen, Kristian Weaver, Nicola Relph and Matt Greig

prevalence in elite youth players has been shown to be higher than that observed in their senior peers, attributed to training exposure in young elite players who lack the skeletal maturity to tolerate the physical demands imposed. 2 Lower-limb musculoskeletal abnormalities, malalignment, and a reduced

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Michael S. Cherry, Sridhar Kota, Aaron Young and Daniel P. Ferris

Although there have been many lower limb robotic exoskeletons that have been tested for human walking, few devices have been tested for assisting running. It is possible that a pseudo-passive elastic exoskeleton could benefit human running without the addition of electrical motors due to the spring-like behavior of the human leg. We developed an elastic lower limb exoskeleton that added stiffness in parallel with the entire lower limb. Six healthy, young subjects ran on a treadmill at 2.3 m/s with and without the exoskeleton. Although the exoskeleton was designed to provide ~50% of normal leg stiffness during running, it only provided 24% of leg stiffness during testing. The difference in added leg stiffness was primarily due to soft tissue compression and harness compliance decreasing exoskeleton displacement during stance. As a result, the exoskeleton only supported about 7% of the peak vertical ground reaction force. There was a significant increase in metabolic cost when running with the exoskeleton compared with running without the exoskeleton (ANOVA, P < .01). We conclude that 2 major roadblocks to designing successful lower limb robotic exoskeletons for human running are human-machine interface compliance and the extra lower limb inertia from the exoskeleton.

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Lewis J. Vizard, Gareth Peden and Maximilian M. Wdowski

Key Points ▸ Lower-limb kinematic and kinetic asymmetries may transfer between dynamic movements. ▸ Individual-level asymmetries present in lower-limb kinematics and kinetics during sprint running and countermovement jumps. Rugby Union is an intermittent contact sport that exposes players to short

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Christopher Kevin Wong, Lizbeth Conway, Grant Fleming, Caitlin Gopie, Dara Liebeskind and Stephen Xue

Clinical Scenario People with musculoskeletal lower quarter dysfunction, whether knee pain, hip arthritis, or low-back pain, can present with lower-limb muscle weakness. Exercise to strengthen weakened muscles is a rehabilitation staple: early strength gains observed in the first 2 weeks have been

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Karen L. Perell, Robert J. Gregor and A.M. Erika Scremin

Biomechanical analysis of the generalized muscle moment and power patterns involved in cycling provides information regarding coordination within each limb. The purpose of this study was to compare individual joint kinetics, bilaterally, in subjects who had experienced cerebrovascular accidents (CVAs). Two-dimensional cinematography and force pedal data in a linked-segment model were used to study 8 ambulatory subjects while they rode a recumbent bicycle. The involved lower limb was defined as the lower limb with the greatest deficits, whereas the contralateral lower limb was defined as the lower limb opposite the involved lower limb and ipsilateral to the lesion site. The contralateral lower limbs of subjects with CVAs demonstrated patterns similar to those reported for nondisabled cyclists on an upright bicycle except for a bimodal hip power generation pattern that was possibly due to compensation for a lack of involved lower limb power generation. There were two critical findings of this study: Single-joint power generation patterns during the power phase indicated that either the hip or the knee, but not both joints, generated power in the involved lower limb, and asymmetrical differences between lower limbs appeared significant at the ankle alone.

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Jessica Ferreira, André Bebiano, Daniel Raro, João Martins and Anabela G. Silva

). Before each test, participants performed 2 training trials (one with the dominant and one with the nondominant limb). Then, each test was repeated 3 times for each lower limb and the mean value was used for statistical analysis. Figure 2 —Representation of the measurements for the three hop tests: single