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Álvaro Cuñado-González, Aitor Martín-Pintado-Zugasti and Ángel L. Rodríguez-Fernández

The prevalence of injury in volleyball is considered lower than in other team sports, such as basketball, handball, or soccer. 1 , 2 These differences are thought to be the consequence of the noncontact nature of volleyball. 3 , 4 However, volleyball injuries accounted for 5.3% of all sports

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Lisa Price, Katrina Wyatt, Jenny Lloyd, Charles Abraham, Siobhan Creanor, Sarah Dean and Melvyn Hillsdon

Understanding the prevalence of physical activity (PA) in children is important to the design of population-level health promotion initiatives. 1 It is recommended that children achieve a minimum of 60 minutes of moderate to vigorous physical activity (MVPA) on each day of the week 2 , 3 to

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Hayley Guiney, Michael Keall and Liana Machado

missing. First, jackknife proportions ( Kott, 1998 ) were calculated to estimate the overall prevalence of each predictor and dependent variable, as well as the proportions of respondents in each characteristic group who were physically inactive or who met the physical activity guidelines. Second

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JooYong Park, Aesun Shin, Miyoung Lee, Jaesung Choi, Minkyo Song, Yeonjung Kim, Jong-koo Lee, Daehee Kang and Ji-Yeob Choi

prevalence of PA is important for providing data for setting health goals, monitoring trends, identifying high-risk groups, creating awareness, developing and evaluating programs, and supporting policy and legislation. 7 With various efforts of surveillance systems to monitor and comprehend PA behaviors

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Sandra A. Ham, Caroline A. Macera, Deborah A. Jones, Barbara E. Ainsworth and Kathleen M. Turczyn

Purpose:

To explore among demographic groups the differences in prevalence estimates of physical activity that may occur as a result of differences in survey design characteristics, including question wording, placement, and examples of activities.

Methods:

We compared responses to similar physical activity instruments administered to large samples of adults in 1999 (n = 9,775), 2000 (n = 32,374), and 1999–2000 (n = 7,529). The questions assessed participation in non-occupational physical activity at vigorous and moderate intensities. Surveys used in-person or telephone interviews.

Results:

The prevalence of recommended levels of physical activity (i.e., ≥3 days and ≥20 min vigorous activities or ≥5 days and ≥30 min moderate activities) varied 10% across 3 surveys. Although survey design characteristics varied, higher prevalence was associated with the use of examples to measure multiple domains of activity and question order.

Conclusions:

Measuring multiple domains is important for assessing health-related physical activity. These results suggest that physical activity measurement varies with question and survey design characteristics.

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Dafna Merom, Heather Bowles and Adrian Bauman

Background:

Walking is the most prevalent form of leisure time physical activity (LTPA). Advances in measurement of walking depend on understanding sources of error in self report. We examined the effect of prompting “walking for exercise, recreation, and sport” (WERS) upon surveillance estimates of LTPA and assessed what types of walking were recalled when reporting LTPA generally and when WERS was prompted specifically.

Methods:

Data were collected by telephone survey from a random sample of 3,415 Australian adults (≥15yrs). Respondents were asked first to recall any type of LTPA they participated in (unprompted) and if walking was not mentioned, WERS was prompted. All walkers were asked to describe the type of walking they did. Open-ended responses were categorized according to physical activity measurement dimensions.

Results:

Forty three percent did not report WERS unless prompted to do so. The prevalence of meeting recommendations by all LTPA was reduced by 10% for both genders and across all age groups if not prompted to recall WERS. The interpretation of WERS was broad and included travel related walking and dog walking whether unprompted or prompted.

Conclusions:

Current challenges in walking surveillance include ensuring that both researchers and respondents understand WERS in a standardized manner.

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Mathew Hillier, Louise Sutton, Lewis James, Dara Mojtahedi, Nicola Keay and Karen Hind

Thai fight in 2017. Despite growing concerns, published data on the extent of RWL in MMA remain scant. Therefore, the purpose of this study was to provide robust data on the prevalence, magnitude, methods, and influencers of gradual and RWL in professional and amateur MMA athletes. Methods Participants

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Jennifer Sygo, Alexandra M. Coates, Erik Sesbreno, Margo L. Mountjoy and Jamie F. Burr

 al., 2015 ; Torstveit & Sundgot-Borgen, 2005 ). Research on speed and/or power athletes, and athletes of non-White descent, however, is limited. The aim of this study was to assess the prevalence of signs and symptoms of LEA in a population of elite and national-level sprinters of both White and Black

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Pedro J. Teixeira, Adilson Marques, Carla Lopes, Luís B. Sardinha and Jorge A. Mota

adults are sufficiently active, with England, Norway, and Sweden showing similar prevalence values. 16 Loyen et al 16 also concluded that 67% of Portuguese adults spent more than 7.5 hours per day in sedentary time, which may affect several morbidity markers such as glycemic control. 17 A limitation of

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João Breno Ribeiro-Alvares, Maurício Pinto Dornelles, Carolina Gassen Fritsch, Felipe Xavier de Lima-e-Silva, Thales Menezes Medeiros, Lucas Severo-Silveira, Vanessa Bernardes Marques and Bruno Manfredini Baroni

factors supported by prospective cohort studies. The objective was to describe the prevalence of the main intrinsic risk factors for HSI in professional and under-20 male football players. Methods Study Design This was a cross-sectional study. All evaluations were carried out during the first 2 preseason