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Steve Hansen, Digby Elliott and Michael A. Khan

The utility of ellipsoids for quantifying central tendency and variability throughout the trajectory of goal-directed movements is described. Aiming movements were measured over 2 days of practice and under full-vision and no-vision conditions. A three-dimensional optoelectronic system measured the movements. Individual ellipsoid locations, dimensions, and volumes were derived from the average location and the spatial variability of the effector’s trajectory at proportional temporal periods throughout the movement. Changes in ellipsoid volume over time illustrate the evolution in motor control that occurred with practice and the processes associated with visual control. This technique has the potential to extend our understanding of limb control and can be applied to practical problems such as equipment design and evaluation of movement rehabilitation.

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Deborah A. Jehu, Yves Lajoie and Nicole Paquet

greater within one testing session (.98) than those between four testing sessions (.92) during overground walking ( Karst, Hageman, Jones, & Bunner, 1999 ). Other research demonstrated that dual-task practice between the experimental protocol in Sessions 1 and 2 resulted in reduced variability of gait

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Ramesh Kaipa, Bethany Howard, Roha Kaipa, Eric Turcat and Laurielle Prema

The process of attaining motor skills involves motor learning, which reflects a permanent capacity in our movement ( Schmidt, 1988 ). Within the context of motor learning, an individual initially practices the target motor task, referred to as the acquisition phase. It is important to understand

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Hideyuki E Izumi and Masaaki Tsuruike

Key Points ▸ No studies have compared the practice patterns of athletic training and therapy (ATT) professionals internationally. ▸ Negligible differences in task practice frequency were found between the United States, Canada, and Ireland. ▸ The similarity in practice patterns supports the

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Richard J. Boergers, Thomas G. Bowman, Nicole Sgherza, Marguerite Montjoy, Melanie Lu and Christopher W. O’Brien

Key Points ▸ Lack of personnel and training are barriers for prehospital equipment removal. ▸ Athletic trainers do not frequently practice equipment removal with emergency medical services (EMS). ▸ Athletic trainers do not have confidence in EMS equipment removal skills. One of the primary roles of

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Srinidhi Bellamkonda, Samantha J. Woodward, Eamon Campolettano, Ryan Gellner, Mireille E. Kelley, Derek A. Jones, Amaris Genemaras, Jonathan G. Beckwith, Richard M. Greenwald, Arthur C. Maerlender, Steven Rowson, Stefan M. Duma, Jillian E. Urban, Joel D. Stitzel and Joseph J. Crisco

understand the trends at the youth level and to gauge the cumulative effect of the head impacts that the players sustain throughout their career. Recent studies have compared head impact exposure of practice and game sessions, 13 , 21 , 22 citing specific drills as having the highest rate of high

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James Hackney, Jade McFarland, David Smith and Clinton Wallis

Most studies investigating high-speed movements of the lower body, such as drop landing, include a series of practice repetitions intended to allow subjects to accommodate to either the movement itself, the condition of the movement, or both ( Ambegaonkar, Shultz, & Perrin, 2011 ; Hackney, Clay

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Dawn M. Emerson, Toni M. Torres-McGehee, Susan W. Yeargin, Kyle Dolan and Kelcey K. deWeber

cooling. Average sweat rates during ice hockey practices vary across collegiate (0.8 L/hr), 3 elite juniors (1.5 and 1.8 L/hr), 1 , 4 and professional players (2.1 to 2.5 L/hr). 2 Further, goalies often have the highest practice sweat rates, ranging from 1.7 to 2.9 L/hr. 1 , 2 , 4 Moderate- to high

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Graeme G. Sorbie, Fergal M. Grace, Yaodong Gu, Julien S. Baker and Ukadike C. Ugbolue

have also been investigated, with the main purpose of evaluating lower back pain. 20 , 21 Both of these investigations found increased muscular fatigue in the erector spinae muscle after performing a specific sporting technique. Horton et al 3 investigated the effect that a golf practice session has

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Femke van Abswoude, John van der Kamp and Bert Steenbergen

the larger group of children with low motor abilities. A recent meta-analysis showed that effective motor interventions in children with DCD included task-specific practice with an emphasis on enhancing children’s problem-solving ability and the provision of feedback ( Smits-Engelsman et al., 2013