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Stefan Wagnsson, Magnus Lindwall and Henrik Gustafsson

The purpose of the study was to test longitudinal (2 years across three occasions) associations between sport participation (SP) and self-esteem (SE) across adolescence (10–18 years), addressing the mediating role of perceived sport competence (PSC) from a developmental perspective. Three waves of data were collected from three age cohorts (10–12, 13–15, and 16–18 years) of school-aged youth (N = 1358). The results demonstrate that SP and SE are related across time and that PSC has an important mediating role in this relationship, both from a skill development and a self-enhancement perspective. In the skill development model, the mediating role of PSC was significantly stronger in the youngest cohort whereas the effect of PSC on subsequent SP in the self-enhancement model was significantly stronger in the 13–15 age group compared with the youngest age group.

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Pedro C. Hallal, Samuel Carvalho Dumith, Felipe Fossati Reichert, Ana M.B. Menezes, Cora L. Araújo, Jonathan C.K. Wells, Ulf Ekelund and Cesar G. Victora

Objectives:

To explore cross-sectional and longitudinal associations between self-reported and accelerometry-based physical activity (PA) and blood pressure (BP) between 11 and 14 years of age.

Methods:

Prospective birth cohort study in Pelotas, Brazil. Participants were 427 cohort members who were followed up with at 11, 12, and 14 years of age, and had questionnaire data on PA and BP at 11 and 14 years, as well as accelerometry and questionnaire data on PA at 12 years. Outcome measures were continuous systolic and diastolic BP at 14 years, and change in BP from 11 to 14 years.

Results:

PA was unrelated to systolic BP in any analyses. PA measured by accelerometry at 12 years, but not questionnaire-derived PA, was inversely associated with diastolic BP at 14 years of age in fully adjusted models. Those who exceeded the 300-minutes PA threshold at all 3 visits had a 2.6 mmHg lower mean increase in DBP from 11 to 14 years compared with those classified below the threshold in all visits.

Conclusions:

Accelerometry-based PA was longitudinally inversely associated with diastolic BP. This finding was not evident when analyzing self-reported PA at a given age, suggesting a possible underestimation of the association when using subjective data.

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Amanda Timler, Fleur McIntyre and Beth Hands

adolescence is level of motor competence. Harter ( 2012 ) describes motor competence as an adolescent’s perceived athletic ability and preference to participate in sports and physical activity, such as outdoor games. An adolescent’s perceived judgement of their motor competence may influence their ability to

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Xavier García-Massó, Adrià Marco-Ahulló, Israel Villarrasa-Sapiña, Julio Álvarez-Pitti and Jose-Luis Bermejo

controversial results in this respect ( Mallau, Vaugoyeau, & Assaiante, 2010 ). Adolescence is also a dynamic period of development that involves rapid changes in body size, shape, and composition. However, despite the continuous biological changes in adolescence, there is not much evidence regarding the effect

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Ben Serrien, Maggy Goossens and Jean-Pierre Baeyens

biomechanics and motor control research. In team sports such as volleyball, it is suggested that TDPs are typically organized during late puberty and adolescence (14–18 years) after the first signs of talent become visible. This period is notable for its considerable hormonal changes and increases in body size

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Leigh Gabel, Heather M. Macdonald, Lindsay Nettlefold and Heather A. McKay

between bone strength and daily steps ( 10 ) and MVPA by accelerometry ( 19 ) in children and youth. Our recent longitudinal study also highlighted the positive association between MVPA by accelerometry and bone strength estimated by HR-pQCT across adolescence ( 13 ). None of these studies, however

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Stein G.P. Menting, Marco J. Konings, Marije T. Elferink-Gemser and Florentina J. Hettinga

18 and cognitive changes 19 , 20 that athletes experience during adolescence, can be expected to have an effect on the development of pacing behavior of youth athletes. 13 To achieve a better understanding of the goal-directed decision-making process involved in pacing, the development process of

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Athanasios Chatzinikolaou, Konstantinos Michaloglou, Alexandra Avloniti, Diamanda Leontsini, Chariklia K. Deli, Dimitris Vlachopoulos, Luis Gracia-Marco, Sotirios Arsenis, Ioannis Athanailidis, Dimitrios Draganidis, Athanasios Z. Jamurtas, Craig A. Williams and Ioannis G. Fatouros

, and a similar biomechanical movement pattern (eg, plyometric jumps). 17 The available information regarding the responses of soccer players to periodized complex strength/power training during early adolescence is limited. Therefore, this study used a comprehensive set of measurements to evaluate the

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Jonathan Miller, Mark Pereira, Julian Wolfson, Melissa Laska, Toben Nelson and Dianne Neumark-Sztainer

preventable deaths per year globally. 2 , 3 Therefore, it is a high public health priority to promote lifelong physical activity. In the United States, 40% of children less than 12 years of age achieve the recommended 60 minutes of moderate to vigorous physical activity (MVPA) per day. 4 By adolescence (13

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Rodrigo Antunes Lima, Lisbeth Runge Larsen, Anna Bugge and Lars Bo Andersen

higher physical fitness was longitudinally associated with better academic performance during childhood, 7–13 years of age, and early adolescence, 10–16 years of age. In addition, WC was negatively associated with academic performance and mediated some of the longitudinal relationship between physical