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Jordan L. Fox, Robert Stanton, Charli Sargent, Cody J. O’Grady and Aaron T. Scanlan

derived from the accelerometer component of the microsensor and calculated as the square root of the sum of the squared rate of change in acceleration across the x, y, and z planes multiplied by a scaling factor of 0.01 for ease of use. 10 In addition, inertial movement analysis variables were recorded

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James W. Roberts

based on endpoint variability is robust ( Elliott et al., 2004 ; Worringham, 1991 ), it remains to be seen whether the same assumption of a normal trend in the response distribution unfolds at earlier kinematic landmarks (peak acceleration [PA], peak velocity [PV], and peak deceleration [PD]). Indeed

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Patricia M. Kelshaw, Trenton E. Gould, Mark Jesunathadas, Nelson Cortes, Amanda Caswell, Elizabeth D. Edwards and Shane V. Caswell

-based assessment of the headgears’ response to controlled blunt impacts. 11 Boys’ lacrosse requires the use of hard-shell helmets that have previously been shown to reduce peak linear acceleration (PLA). 12 Some laboratory tests of men’s lacrosse helmets have shown that there is a potential for the helmets to

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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

instrumented with the Head Impact Telemetry (HIT) System (Simbex, Lebanon, NH) that is part of the [Riddell] Sideline Response System (SRS; Riddell, Elyria, OH). The HIT System measures linear acceleration of the center of gravity of the head, estimates rotational acceleration at the center of gravity, and

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Dinesh John, Qu Tang, Fahd Albinali and Stephen Intille

have emphasized the need to standardize data collection, processing, and analyses using raw acceleration data and non-proprietary algorithms ( Wijndaele et al., 2015 ). However, inconsistency and transparency among popular research-grade devices ( John, Morton, Arguello, Lyden, & Bassett, 2018 ; John

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Daisuke Kume, Akira Iguchi and Hiroshi Endoh

sporting and school settings ( 11 , 25 , 27 , 29 , 33 ). In this test, participants run back-and-forth between 2 lines 20 m apart; the running speed is gradually increased until exhaustion. Thus, the 20mSRT is an incremental running exercise involving acceleration and deceleration with frequent change of

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Robyn F. Madden, Kelly A. Erdman, Jane Shearer, Lawrence L. Spriet, Reed Ferber, Ash T. Kolstad, Jessica L. Bigg, Alexander S.D. Gamble and Lauren C. Benson

accelerometer (Shimmer3 GSR+ ±16 g; Shimmer Inc, Dublin, Ireland) was secured to the back of their helmets using nonelastic tape to record 3-dimensional acceleration data. Participants wore the same accelerometer unit for each session to reduce measurement error. As the effect of caffeine on physicality was

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John Strickland and Grant Bevill

’s mask). Owing to the differences in construction, the authors’ hypothesize that catcher’s masks represent a bound in the achievable performance of fielder’s masks. In literature, Beyer et al 8 and Shain et al 9 observed significant reductions (∼55% to 85%) in head accelerations for catcher’s masks

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Ignacio Perez-Pozuelo, Thomas White, Kate Westgate, Katrien Wijndaele, Nicholas J. Wareham and Soren Brage

acceleration signal, including the magnitude of movement and the orientation of the accelerometer with respect to gravity. Previous research using wrist accelerometry has described variation in population physical activity expressed predominantly as the activity-related acceleration magnitude. For example, da

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Alex V. Rowlands, Tatiana Plekhanova, Tom Yates, Evgeny M. Mirkes, Melanie Davies, Kamlesh Khunti and Charlotte L. Edwardson

activity measurement has advanced significantly. With the release of non-proprietary raw acceleration monitors that are being incorporated in many large surveys globally, there is considerable potential for data harmonization. Given that physical inactivity is a leading risk factor for non