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Meghann Lloyd, Rachel C. Colley, and Mark S. Tremblay

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Peter G. Breithaupt, Rachel C. Colley, and Kristi B. Adamo

The aim of the current study was to investigate the relationship between the Oxygen Uptake Efficiency Slope (OUES) and traditional measures of cardiorespiratory function in an overweight/obese pediatric sample. Maximal treadmill exercise testing with indirect calorimetry was completed on 56 obese children aged 7–18 years. Maximal OUES, submaximal OUES, VO2peak, VEpeak, and ventilatory threshold (VT) were determined. In line with comparable research in healthy-weight samples, maximal and submaximal OUES were both correlated with VO2peak, VEpeak, and VT (r2= 0.44−0.91) in the obese pediatric sample. Correlations were also found with anthropometric variables, including height (cm), body surface area (m2), body mass (kg), and fat free mass (kg). In comparing our data to a published sample of healthy weight children, maximal and submaximal exercise OUES were both higher in our obese sample. However, when we adjusted for any of body mass (kg), BSA (m2), or FFM (kg) the obese children were found to be less efficient. The results of this study suggest the use of OUES to be an appropriate measure of efficiency of ventilation and cardiorespiratory function in obese children, while also showing that our sample of obese children were less efficient on a per kilogram basis when compared with their healthy weight peers.

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Scott Rollo, Karen C. Roberts, Felix Bang, Valerie Carson, Jean-Philippe Chaput, Rachel C. Colley, Ian Janssen, and Mark S. Tremblay

Background: This study examined associations between sociodemographic factors and meeting versus not meeting the new Canadian 24-Hour Movement Guidelines recommendations. Methods: The study is based on 7651 respondents aged 18–79 years from the 2007 to 2013 Canadian Health Measures Survey, a nationally representative, cross-sectional survey. Sociodemographic factors included age, sex, household education, household income, race, having a chronic condition, smoking status, alcohol consumption, and body mass index. Participants were classified as meeting or not meeting each of the time-specific recommendations for moderate to vigorous physical activity, sedentary behavior, and sleep duration. Results: Being an adult aged 18–64 years, normal weight, nonsmoker, and not having a chronic condition were associated with meeting the integrated guidelines. Being aged 18–64 years, male, normal weight, nonsmoker, not having a chronic condition, having a higher household education, and higher household income were associated with meeting the moderate to vigorous physical activity recommendation; being aged 18–64 years was associated with meeting the sedentary behavior recommendation; and being white, not having a chronic condition, and having a higher household income were associated with meeting the sleep duration recommendation. Conclusions: Few Canadian adults met the 2020 Canadian 24-Hour Movement Guidelines, and disparities across sociodemographic factors exist. Implementation strategies and dissemination approaches to encourage uptake and adoption are necessary.

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Danilo Fernandes da Silva, Shuhiba Mohammad, Taniya Singh Nagpal, Sara Carolina Scremin Souza, Rachel C. Colley, and Kristi Bree Adamo

Background: The authors examined whether or not ≤3 days wearing Actical® accelerometers provided acceptable results in comparison with the recommendation of ≥4 days in women across gestation. Methods: A total of 26, 76, and 57 participants at early, mid, and late pregnancy, respectively, were assessed. Participants were instructed to wear the device for 7 days and women who wore it for ≥4 days were included. For each participant, 3, 2, and 1 day(s) were randomly selected. Paired comparisons, intraclass correlations coefficients, and kappa statistics were performed for ≥4 days (criterion) versus 3, 2, and 1 day(s). Averages (in minutes per day) of sedentary time, light, moderate, vigorous, moderate to vigorous physical activity (PA) and steps per day were examined. Results: When 3 valid days were compared with the criterion, no significant differences were found for any gestational period. The intraclass correlations coefficients were “high” for all PA-related variables. The k values varied from .819 to .838 across pregnancy (“strong”). Two and 1 valid day(s) versus the criterion showed significant differences in some PA intensities, reduced intraclass correlations coefficients, “moderate” k values for 2 valid days (.638–.788) and “minimal-to-moderate” k values for 1 valid day (.367–.755). Conclusion: In pregnant women during early, mid, and late pregnancy, PA data obtained from 3 valid days of wear was equivalent and agreed with ≥4 valid days.

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Joel D. Barnes, Christine Cameron, Valerie Carson, Jean-Philippe Chaput, Rachel C. Colley, Guy E.J. Faulkner, Ian Janssen, Roger Kramers, Travis J. Saunders, John C. Spence, Patricia Tucker, Leigh M. Vanderloo, and Mark S. Tremblay