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Janet M. Boekhout, Brenda A.J. Berendsen, Denise A. Peels, Catherine A.W. Bolman, and Lilian Lechner

into this association would be useful. As pointed out in recent reviews ( Petitte et al., 2015 ; Poscia et al., 2018 ), there is a paucity in research focusing on diminishing loneliness in persons with chronic diseases. Moreover, longitudinal studies into the association between PA and loneliness for

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Rodrigo Antunes Lima, Karin A. Pfeiffer, Niels Christian Møller, Lars Bo Andersen, and Anna Bugge

regarding the relationship between PA and academic performance. 3 One of the important issues that warrants consideration is study design. The vast majority of previous studies have been cross-sectional, and the results are inconsistent. 3 Most of the longitudinal studies that exist report positive

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Leanna M. Ross, Jacob L. Barber, Alexander C. McLain, R. Glenn Weaver, Xuemei Sui, Steven N. Blair, and Mark A. Sarzynski

 al . Ideal cardiovascular health and mortality: Aerobics Center Longitudinal Study . Mayo Clin Proc . 2012 ; 87 : 944 – 952 . PubMed ID: 23036670 doi:10.1016/j.mayocp.2012.07.015 10.1016/j.mayocp.2012.07.015 23036670 3. Fang N , Jiang M , Fan Y . Ideal cardiovascular health metrics and risk of

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Niels B. Feddersen, Robert Morris, Louise K. Storm, Martin A. Littlewood, and David J. Richardson

time. Probing the underlying processes could help understand what drives and facilitates people’s and organizations’ behaviors in sport ( Girginov, 2010 ). A Longitudinal Study Into a Change of Culture in Elite Sports in the United Kingdom It is time to extend organizational culture research because

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Daniel J. Madigan, Joachim Stoeber, and Louis Passfield

Perfectionism in sports has been shown to be associated with burnout in athletes. Whether perfectionism predicts longitudinal changes in athlete burnout, however, is still unclear. Using a two-wave cross-lagged panel design, the current study examined perfectionistic strivings, perfectionistic concerns, and athlete burnout in 101 junior athletes (mean age 17.7 years) over 3 months of active training. When structural equation modeling was employed to test a series of competing models, the best-fitting model showed opposite patterns for perfectionistic strivings and perfectionistic concerns. Whereas perfectionistic concerns predicted increases in athlete burnout over the 3 mon ths, perfectionistic strivings predicted decreases. The present findings suggest that perfectionistic concerns are a risk factor for junior athletes contributing to the development of athlete burnout whereas perfectionistic strivings appear to be a protective factor.

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Daniele Magistro, Filippo Candela, Paolo Riccardo Brustio, Monica Emma Liubicich, and Emanuela Rabaglietti

Functional aging processes are characterized by a loss of performance capabilities for most physiological systems, such as aerobic endurance and lower body strength, which are important for independent living and active aging. The present study examines the direction of influence between aerobic endurance and lower body strength over time in Italian sedentary older adults. A three-wave longitudinal model was tested using cross-lagged analysis for 202 individuals aged over 65 years (mean = 73.92, SD = 5.84; 140 females). Analysis revealed that aerobic endurance and lower body strength decline over time. In addition, greater aerobic endurance positively affected lower body strength over time; however, the converse was true only during the first period (first 6 months). These findings emphasize the importance of these relationships for the design and implementation of effective physical intervention for older adults.

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Daniel J. Madigan, Joachim Stoeber, and Louis Passfield

Perfectionism in sports has been shown to predict longitudinal changes in athlete burnout. What mediates these changes over time, however, is still unclear. Adopting a self-determination theory perspective and using a three-wave longitudinal design, the current study examined perfectionistic strivings, perfectionistic concerns, autonomous motivation, controlled motivation, and athlete burnout in 141 junior athletes (mean age = 17.3 years) over 6 months of active training. When multilevel structural equation modeling was employed to test a mediational model, a differential pattern of between- and within-person relationships emerged. Whereas autonomous motivation mediated the negative relationship that perfectionistic strivings had with burnout at the between- and within-person level, controlled motivation mediated the positive relationship that perfectionistic concerns had with burnout at the between-persons level only. The present findings suggest that differences in autonomous and controlled motivation explain why perfectionism predicts changes in athlete burnout over time.

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Chantelle Zimmer and Meghan H. McDonough

significantly moderate the associations, or the strength and direction of any moderator effects. Data from the Canadian Longitudinal Study on Aging (CLSA) were used for this study because the number and variety of social support variables available enabled us to address the first research objective, and the

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Byron J. Kemp, Anne-Maree Parrish, Marijka Batterham, and Dylan P. Cliff

active, longitudinal studies of PA domains may provide more specific behavioral targets for intervention. Despite this, the longitudinal changes in domains of PA during childhood and adolescence are still not well understood. In particular, a recent systematic review of longitudinal changes in PA domains

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Ítalo Ribeiro Lemes, Xuemei Sui, Bruna Camilo Turi-Lynch, Steven N. Blair, Rômulo Araújo Fernandes, Jamile Sanches Codogno, and Henrique Luiz Monteiro

, L.K. ( 2016 ). Determining the association between types of sedentary behaviours and cardiometabolic risk factors: A 6-year longitudinal study of French adults . Diabetes & Metabolism, 42 ( 2 ), 112 – 121 . PubMed ID: 26404651 doi:10.1016/j.diabet.2015.08.004 10.1016/j.diabet.2015