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Barbara E. Ainsworth, Carl J. Caspersen, Charles E. Matthews, Louise C. Mâsse, Tom Baranowski and Weimo Zhu

Context:

Assessment of physical activity using self-report has the potential for measurement error that can lead to incorrect inferences about physical activity behaviors and bias study results.

Objective:

To provide recommendations to improve the accuracy of physical activity derived from self report.

Process:

We provide an overview of presentations and a compilation of perspectives shared by the authors of this paper and workgroup members.

Findings:

We identified a conceptual framework for reducing errors using physical activity self-report questionnaires. The framework identifies 6 steps to reduce error: 1) identifying the need to measure physical activity, 2) selecting an instrument, 3) collecting data, 4) analyzing data, 5) developing a summary score, and 6) interpreting data. Underlying the first 4 steps are behavioral parameters of type, intensity, frequency, and duration of physical activities performed, activity domains, and the location where activities are performed. We identified ways to reduce measurement error at each step and made recommendations for practitioners, researchers, and organizational units to reduce error in questionnaire assessment of physical activity.

Conclusions:

Self-report measures of physical activity have a prominent role in research and practice settings. Measurement error may be reduced by applying the framework discussed in this paper.

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Justine J. Reel and Emily Crouch

Action If this special issue sparks an interest in you, please act on your passion. Conduct research and practice in this area. Be an advocate for a safe workplace. Institutions where sexual harassment festers—athletic organizations, colleges, businesses—should form mutual partnerships with advocates of

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Alan L. Smith and Daniel Gould

believe that the ISYS has played an important role in the development and direction of youth sport scholarship. We then provide an overview of the organization and contents of this special issue. The issue addresses a broad range of topics and critical issues in contemporary youth sport that have bearing

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Pazit Levinger and Keith D. Hill

contributed to $13.7 billion in productivity losses, and physical inactivity was responsible for 13.4 million disability-adjusted life-years worldwide. 3 To tackle the concerning level of physical inactivity worldwide, the World Health Organization released an action plan to promote physical activity, with a

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Soultana Macridis, Christine Cameron, Jean-Philippe Chaput, Tala Chulak-Bozzer, Patricia Clark, Margie H. Davenport, Guy Faulkner, Jonathon Fowles, Lucie Lévesque, Michelle M. Porter, Ryan E. Rhodes, Robert Ross, Elaine Shelton, John C. Spence, Leigh M. Vanderloo and Nora Johnston

questions, methods, and the way in which information is obtained and interpreted within real-world practice, and has the potential to increase awareness, knowledge, and beliefs on issues across large populations. ParticipACTION (www.participaction.com) is recognized as a national nonprofit organization that

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George B. Cunningham, Erin Buzuvis and Chris Mosier

bathroom bill, although lawmakers repealed the mandate later in 2017 ( Berman & Phillips, 2017 ). Even though the bathroom bills ultimately failed, the effects on transgender individuals were nevertheless lasting. Consider data from the Trevor Project—an organization that offers suicide-prevention services

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Nisha Botchwey, Myron F. Floyd, Keshia Pollack Porter, Carmen L. Cutter, Chad Spoon, Tom L. Schmid, Terry L. Conway, J. Aaron Hipp, Anna J. Kim, M. Renee Umstattd Meyer, Amanda L. Walker, Tina J. Kauh and Jim F. Sallis

Alaska Native youth range from 25% to 31%, depending on the age group. 15 Although disparities are still present, collaboration among diverse institutions at the local level—such as government agencies, hospitals, school districts, nongovernmental organizations, and faith-based organizations—have proven

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Eric Tsz-Chun Poon, John O’Reilly, Sinead Sheridan, Michelle Mingjing Cai and Stephen Heung-Sang Wong

’Reilly et al., 2016 ). Based on World Health Organization classifications ( Brown & Josse, 2002 ), three levels of bone condition (normal, osteopenia, or osteoporosis) can be determined from the DXA T score. Serum Hormonal Markers Early-morning-fasted blood samples (10 ml) were acquired by a qualified

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Alison Griffin, Tim Roselli and Susan L. Clemens

It is widely accepted that achieving sufficient levels of physical activity (PA) is important for good health and that insufficient PA contributes significantly to the overall burden of disease and healthcare costs. The World Health Organization Global Action Plan on PA states that “. . . regular

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Mitch Abrams and Michelle L. Bartlett

. Thus, it is critical to refer the athlete to a clinical sport psychologist who has experience in identifying trauma in sports. If the sport organization does not have such a referral source, one should be sought out immediately. The American Psychological Association provides a resource to find a local