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Timothy B. Hartwig and Geraldine Naughton

Despite widespread encouragement for children to participate in sport, the efficacy of early sporting pathways remains underexplored. We compared a rotational junior-sport model combining skills from rugby, cricket, and netball with a modified games model. Motion analysis was used to quantify movement. Results revealed no differences between sporting models in relative percent time spent stationary (p = .32), walking (p = .89), jogging (p = .45), and fast running (p =.06). The rotational model had a greater number of skill-development opportunities per minute (median = 3.4) compared with the modified games model (median = 1.1, p = .001). Promising results from varied and rotational skill exposure warrant further elucidation.

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Ivan A. Trujillo-Priego, Judy Zhou, Inge F. Werner, Weiyang Deng, and Beth A. Smith

found differences in movement quantity, quality, and activity intensity between infants with typical development and those with (or at risk for) atypical development ( Abrishami et al., 2019 ; Angulo-Kinzler et al., 2002 ; Fan, Gravem, Cooper, & Patterson, 2012 ; Goodfellow et al., 2018 ; Heinze

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Alex T. Strauss, Austin J. Parr, Daniel J. Desmond, Ashmel T. Vargas, and Russell T. Baker

, corrective exercise, core stability training) tested have been found to be generally ineffective or require long application periods to produce improvements. 23 , 24 Total Motion Release (TMR ® ) is a novel intervention strategy proposed to rapidly improve movement quantity and quality. 25 – 27 Although few

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Nadja Schott and Nancy Getchell

 al., 1991 ; Haywood & Getchell, 2020 ). The movement components for the overarm throw for force are step action (SA), trunk action (TA), preparatory arm backswing, as well as arm action (humerus action and FA; see also Table S1 Supplementary Material [available online]). In addition, we assessed movement

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movement quantity; 2. proportion of movements within acceleration band compared to general movement quantity (Prop)) and variability of acceleration (1. nonlinear variability: sample entropy (SampEn); 2. linear variability: interquartile range (IQR)) of their leg movements during the contingency session

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within the peak block (2-minute block with the highest movement quantity above the contingency threshold) and their performance. A positive correlation was found between visual fixation duration on the robot and infant performance ratio (rho = 0.75, p  = 0.02). Infant performers had a higher average