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Howard N. Zelaznik

variability that results. Theoretically, these timing constraints are thought to require an individual to control a movement with a single positive acceleration profile followed by a single negative acceleration profile. On the other hand, because the Fitts task is spatially constrained, the negative

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John H. Challis

motion, but this is achieved by angular motion of the limbs about the joints. These motions of the limbs require angular acceleration. An object’s resistance to angular acceleration is a function of the object’s moment of inertia ( I ). The object’s moment of inertia is a function of the object’s mass

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Hendrik Reimann, Tyler Fettrow and John J. Jeka

velocity of the CoM and its distance from the ground contact point, or center of pressure (CoP). The relationship between these two points is that the horizontal acceleration of the CoM is proportional to the displacement between the CoM and the CoP ( Hof et al., 2005 ). We will restrict our description to

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Tracey Covassin, Kyle M. Petit and Morgan Anderson

acceleration or a whip-lash mechanism (i.e., acceleration/deceleration) of the head ( McCrory et al., 2017 ). The impact causes shearing and stretching injuries to axons that impair neuronal function, resulting in the release of excitatory neurotransmitters (e.g., glutamate), which creates an ionic imbalance

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Debra J. Rose

yet to be resolved. The lack of a gold standard against which to measure the time spent in MVPA, the different methods used to convert acceleration into MVPA, and the use of different body sites from which to collect the data were identified as important problems that needed to be resolved as the

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David R. Bassett, Patty S. Freedson and Dinesh John

than they were 20 years ago. In part, this is due to the lack of a gold standard and the difficulty in using accelerometers to obtain precise estimates of energy expenditure on a minute-by-minute basis. In addition, there has been a proliferation of methods used to convert movement acceleration into

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Adam D.G. Baxter-Jones

-maturing boys’ body physiques had over the less-mature body physiques of late maturers (see Figure  1 ; Baxter-Jones & Helms, 1994 ; Beunen, 1989 ). Furthermore, it was suggested that the apparent acceleration in stature noted by previous researchers such as Adams ( 1938 ) or the slowing in growth noted by

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Robert W. Motl and Rachel Bollaert

an estimate of time spent sitting, expressed as minutes or hours per day. Devices provide objective information about sedentary behaviors in MS ( Sasaki, Sandroff, Bamman, & Motl, 2017 ). Motion sensors such as accelerometers objectively measure acceleration of the body over long periods of time

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Alan L. Smith and Daniel Gould

helps stimulate an acceleration of scholarship on the topic over the coming decades. In the following sections, we offer a brief overview of the origins and mission of the ISYS, emphasizing its role in identifying critical youth sport issues and using sport-science research to address those issues. We

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Cheryl M. Glazebrook

, 15 ( 2 ), 117 – 137 . doi:10.1080/17408980902791586 10.1080/17408980902791586 Schmidt , R.A. ( 1975 ). A schema theory of discrete motor skill learning . Psychological Review, 82 ( 4 ), 225 – 260 . doi:10.1037/h0076770 10.1037/h0076770 Schmidt , R.A. ( 1989 ). Unintended acceleration: A