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Rebecca E. Hasson

 al., 2009 ) and lower academic achievement ( Carlson et al., 2008 ; Kwak et al., 2009 ) than regularly active children. Research has consistently documented age disparities in youth physical activity, with children’s participation in MVPA decreasing by 38 minutes per year from age 9 to age 15 ( Nader

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Hannah G. Calvert, Matthew T. Mahar, Brian Flay and Lindsey Turner

interaction terms to test a priori hypothesized disparities. Given literature showing that males accrue more steps than females across the school day, 18 we hypothesized that males would accrue more steps than females during all PA opportunities (PE, recess, and CBPA). Similarly, given that PA levels are

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Sara Santarossa, Paige Coyne, Sarah J. Woodruff and Craig G. Greenham

the types and tones of thoughts and opinions generated around the athletes may differ depending on the gender of the athlete, with commenters on male body-image athletes more likely to use profanity than on women body-image athletes. A gender disparity was also identified in terms of ESPN’s Instagram

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Samantha M. Ross, Ellen Smit, Joonkoo Yun, Kathleen Bogart, Bridget Hatfield and Samuel W. Logan

school-aged children engage in at least 60 minutes of moderate to vigorous exercise, sport, or PA daily. 4 Children with disabilities are a recognized priority group, 5 reporting some of the lowest PA levels among US school-aged children. 6 – 9 However, estimating the magnitude of PA disparities

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Gopal K. Singh, Michael D. Kogan, Mohammad Siahpush and Peter C. van Dyck

Background:

This study examines state and regional disparities in vigorous physical activity levels among US children age 6 to 17 years.

Methods:

The 2003 National Survey of Children’s Health was used to calculate vigorous physical activity (VPA) and no days of vigorous physical activity (NVPA) prevalence by state and geographic region. Logistic and least squares regression were used to analyze geographic disparities.

Results:

Vigorous physical activity levels varied substantially across geographic areas, with the East Southcentral region of the US having the highest NVPA prevalence (13.4%) and the Pacific region the lowest prevalence (9.1%). Children in Georgia and Tennessee had 2.2 to 2.3 times higher odds and children in DC, Oklahoma, Arkansas, Indiana, Kentucky, Kansas, New Jersey, South Carolina, and Washington (adjusted prevalence >13.4%) had 1.8 to 2.0 times higher odds of NVPA than children in California (adjusted prevalence = 8.4%). Adjustment for race/ethnicity, socioeconomic status, social capital, television viewing, sleep behavior, and parental physical activity doubled the magnitude of geographic disparities in vigorous physical activity levels. Area poverty, income inequality, and violent crime rates were independent predictors of VPA and NVPA.

Conclusions:

Although individual and area-level socioeconomic factors are important predictors, substantial geographic disparities remain, with children in several Southern states having particularly high risks of NVPA.

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Wendell C. Taylor, Myron F. Floyd, Melicia C. Whitt-Glover and Joseph Brooks

Background:

Despite the importance of physical activity (PA) for good health, not all populations have equal access to PA facilities and resources. This disparity is an environmental justice (EJ) issue because of the negative impact on the health of low-income and racial/ethnic minorities.

Methods:

This paper reviews the first wave of the EJ movement, presents the second wave of the EJ movement, discusses the implications of adopting principles from the EJ movement to focus on research in parks and recreation services (PRS), and recommends future research directions.

Results:

Studies on EJ have documented the disproportionate burden of environmental challenges experienced by low-income and racial/ethnic minorities. With regard to PA, these communities face inadequate access to, quality of, financing for, and public involvement in recreation opportunities.

Conclusions:

EJ is a useful framework to facilitate collaborative research between public health and PRS to study racial/ethnic and socioeconomic disparities in PA.

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Philip Noyes, Lawrence Fung, Karen K. Lee, Victoria E. Grimshaw, Adam Karpati and Laura DiGrande

Background:

Regular physical activity such as biking can help prevent obesity and chronic disease. Improvements in cycling infrastructure are associated with higher overall cycling rates, but less is known about bike lane utilization in low-income urban neighborhoods.

Methods:

During the summer of 2009, 4 Central Brooklyn streets with bicycle lanes were studied using camcorders to record for a total of 40 hours. Video recordings were coded for behaviors and characteristics of cyclists and motorists. An intercept survey (N = 324, 42% participation rate) captured information on cyclist demographics, behaviors, and attitudes.

Results:

1282 cyclists were observed on study streets. Cyclists were primarily male (80.0%) and non-White (54.5%). 9.9% of motorists drove in the bike lane and parked vehicles blocked the bike lane for 9.6% of the observational period. Of cyclists surveyed, 69.4% lived locally, 61.3% were normal weight or underweight, and 64.8% met recommended levels of physical activity by cycling 30+ minutes/day on 5+ days of the past week.

Conclusions:

Bicycle lanes were used by local residents of a low-income urban neighborhood. Compared with neighborhood residents overall, cyclists reported better health and health behaviors. Enhancing infrastructure that supports active transportation may be effective in reducing health inequities in low-income urban communities.

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Betteco J. de Boer, C. (Lieke) E. Peper, Arne Ridderikhoff and Peter J. Beek

In the current study, we examined whether coupling influences resulting from unintended afference-based phase entrainment are affected by movement amplitude as such or by the amplitude relation between the limbs. We assessed entrainment strength by studying how passive movements of the contralateral hand influenced unimanual coordination with a metronome. Results showed that amplitude as such did not affect entrainment strength, whereas the amplitude relation between the hands did. Larger amplitudes of the passive hand relative to the active hand resulted in stronger entrainment. This dependence on relative amplitude implies that entrainment strength is not only based on the intensity of afferent signals generated in the entraining limb but also on the susceptibility of the entrained limb to these signals.

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Elizabeth E. Dawson-Hahn, Megan D. Fesinmeyer and Jason A. Mendoza

Background:

Physical activity is associated with long-term benefits for health and tracks from early childhood into later adolescence. Limited information exists about factors influencing physical activity among Latino preschoolers. We aimed to identify correlates of objectively measured light-to-vigorous-intensity physical activity as a proportion of wear time (% PA) in Latino 3–5 year olds.

Methods:

Latino preschoolers (n = 96) were recruited from Head Start centers in Houston, TX, USA, from 2009 to 2010. Sociodemographics, anthropometrics, acculturation, neighborhood disorder, and TV viewing were measured. Actigraph GT1M accelerometers measured physical activity. Block linear regression was used with % PA as the dependent variable.

Results:

Children achieved 285.7 ± 58.0 min/day of PA. In the final adjusted-model, child age, parental education and neighborhood disorder were positively associated with % PA (beta = 0.33, p = .002; beta = 0.25, p = .038; beta = 0.22, p = .039, respectively). TV viewing was inversely associated with % PA (beta=-0.23, p = .027).

Conclusion:

The majority of Latino preschoolers in our study exceeded US national and international guidelines of physical activity duration. Future interventions to sustain physical activity should focus on the influence of age, socioeconomic status, neighborhood disorder, and TV viewing on Latino preschoolers’ attainment of physical activity.

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Andrew Renfree, Louise Martin, Ashley Richards and Alan St Clair Gibson

Purpose:

This study examined individual contributions to overall pacing strategy during 2- and 5-km rowing trials in a coxless-4 boat.

Methods:

A crew of 4 male rowers performed maximal-effort on-water trials over 2 and 5 km, and power output during every individual stroke was measured for each crew member. Mean overall boat and individual rower stroke power were calculated for each 25% epoch (25% of total strokes taken), and power for each individual epoch was calculated as a percentage of mean power maintained over the entire distance. The coefficient of variation was used to determine stroke-to-stroke and epoch-to-epoch variability for individual rowers and the overall boat.

Results:

In both trials, the overall pacing strategy consisted of a high power output in the initial 25% that decreased in the middle 50% and increased again in the final 25%. However, individual rower data indicate wide variation in individual power profiles that did not always mimic the overall boat profile.

Conclusions:

This study demonstrates that overall boat power profiles during 2- and 5-km rowing trials are similar to velocity profiles previously reported for individual ergometry and on-water racing events. However, this overall profile is achieved despite considerable variation in individual rower profiles. Further research is warranted to determine the mechanisms through which individual contributions to overall pacing strategy are regulated and the effectiveness or otherwise of seemingly disparate individual strategies on overall performance.