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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

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Gregory J. Welk

, assessment procedures typically necessitate a calibration process to facilitate scoring and interpretation of the information that is collected from various instruments. For example, accelerometry-based activity monitors produce raw indicators of movement (based on acceleration) that need to be converted

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Mark Lowes and Christopher Robillard

.4.446 Hutchins , B. ( 2011 ). The acceleration of media sport culture . Information, Communication & Society, 14 ( 2 ), 237 – 257 . doi:10.1080/1369118X.2010.508534 10.1080/1369118X.2010.508534 Lowes , M. ( 1997 ). Sports page: A case study in the manufacture of sports news for the daily press