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Neil Armstrong and Jo Welsman

regression modeling (MLwiN version 3.02; Centre for Multilevel Modelling, University of Bristol, Bristol, UK), adopting the multiplicative, allometric approach described by Nevill et al ( 30 ). Initial (baseline) models sought to investigate sex differences across the age range 10–18 years of age, with age

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Ken Pitetti, Ruth Ann Miller and E. Michael Loovis

whom combining all age groups for each subtest item. Sex × Subtest Items × Age Groups When considering the 95 comparisons (19 Subtest Items × 5 Age Groups), only four subtest items for one age group (8–10 years) demonstrated a sex difference with males performing significantly better than females (see

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Nick Dobbin, Cari Thorpe, Jamie Highton and Craig Twist

fatiguing exercises, which offers a possible explanation for the different fatigability in males and females. However, sex differences in muscle force generating capability after damaging exercise remain unclear, with either no difference between sexes 11 – 15 or greater losses for females compared with

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Tracey Covassin, Kyle M. Petit and Morgan Anderson

using validated age-appropriate neurocognitive assessments. Previous research has also examined sex differences with regard to neurocognitive impairments after SRC. Overall, the literature is inconsistent on whether there are sex differences in youth athletes under the age of 13 years. This could be due

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Xihe Zhu and Justin A. Haegele

within school j for girls; (sex) ij is coded 0 for girls, and 1 for boys; and β 01j , β 11j , and β 21 j are sex difference in fitness knowledge test score, annual knowledge linear growth rate in school j , and possible second-order growth differentials, respectively. The Level 2 random factors

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.3.281 Pelvifemoral Kinematics while Ascending Single Steps of Different Heights Richard W. Bohannon * Jason Smutnick * 8 2010 26 3 290 294 10.1123/jab.26.3.290 Sex Differences and Discriminative Value of Lower Extremity Alignments and Kinematics during Two Functional Tasks Jennifer M. Medina McKeon * Craig R

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Moniek Akkerman * Marco van Brussel * Bart C. Bongers * Erik H.J. Hulzebos * Paul J.M Helders * Tim Takken * 8 2010 22 3 431 441 10.1123/pes.22.3.431 Confounding Effect of Biologic Maturation on Sex Differences in Physical Activity and Sedentary Behavior in Adolescents Aristides M. Machado

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. Sisson * Michael P. Anderson * 8 2014 11 11 6 6 1179 1179 1186 1186 10.1123/jpah.2012-0245 Sex Differences in Genetic and Environmental Influences on Percent Body Fatness and Physical Activity Erin White * Jennifer D. Slane * Kelly L. Klump * S. Alexandra Burt * Jim Pivarnik * 8 2014 11 11 6

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Representation in Complex Motor Action Cornelia Frank * Taeho Kim * Thomas Schack * 1 06 2018 6 1 53 72 10.1123/jmld.2017-0007 jmld.2017-0007 Let’s Make It Real: A Commentary on Observation Research Amanda M. Rymal * 1 06 2018 6 1 73 80 10.1123/jmld.2018-0015 jmld.2018-0015 ORIGINAL RESEARCH Age and Sex

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-Report Measures of Sitting Time Stacy A. Clemes * Beverley M. David * Yi Zhao * Xu Han * Wendy Brown * 5 2012 9 9 4 4 533 533 539 539 10.1123/jpah.9.4.533 Sex Differences, Age, Arthritis, and Chronic Disease: Influence on Physical Activity Behaviors Simone A. Kaptein * Elizabeth M. Badley * 5 2012 9