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Emily Borgundvaag, Michael McIsaac, Michael M. Borghese and Ian Janssen

Moderate to vigorous physical activity (MVPA) benefits a child’s health. 1 Accelerometers are commonly used to objectively measure how much MVPA children accumulate. Issues inherent to accelerometers may lead to biased MVPA estimates. 2 , 3 One of these issues is nonwear time. Nonwear time occurs

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Sara Knaeps, Stijn De Baere, Jan Bourgois, Evelien Mertens, Ruben Charlier and Johan Lefevre

amount of sedentary time with moderate to vigorous physical activity (MVPA). 8 – 11 Results from previous research clearly state that substituting sedentary time with MVPA will lead to lower clustered cardiometabolic health risk than substituting with LPA or sleep. Nonetheless, some uncertainty remains

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Quinn Malone, Steven Passmore and Michele Maiers

points has been shown to significantly vary the amount of moderate-to-vigorous physical activity (MVPA) reported in obese children ( Banda et al., 2016 ), adults ( Watson, Carlson, Carroll, & Fulton, 2013 ), and those with coronary artery disease ( Prince et al., 2015 ). When the same set of data is

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Gerson Luis de Moraes Ferrari, Victor Matsudo, Tiago V. Barreira, Catrine Tudor-Locke, Peter T. Katzmarzyk and Mauro Fisberg

Background:

Few studies have used ecological models to study multiple levels of association with objectively measured moderate-to-vigorous physical activity (MVPA) in young children from middle-income countries. The purpose of this study was to examine potential correlates of objectively measured MVPA in Brazilian children.

Methods:

The sample consisted of 328 children. An Actigraph GT3X+ accelerometer was used to monitor MVPA over 7 days. Body mass index and body fat percentage were measured using a bioelectrical impedance scale. Questionnaires completed by the children, their parents, and school personnel queried individual, family and home, and school-level environmental correlates.

Results:

Children averaged 59.3 min/d in MVPA (44.5% met MVPA guidelines), and 51.8% were overweight/obese. For boys and girls combined, significant correlates (P < .05) of MVPA were waist circumference (β = –.007), travel mode to school (β = .140), maternal employment status (β = –.119) and TV in bedroom (β –.107). In boys, significant correlates of MVPA were waist circumference (β = –.011), travel mode to school (β = .133), and maternal employment status (β = –.195). In girls, the only significant correlate of MVPA was travel mode to school (β = .143).

Conclusions:

Several factors were identified as correlates of MVPA in Brazilian children; however, only travel mode to school was common for both boys and girls.

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Evelin Lätt, Jarek Mäestu and Jaak Jürimäe

risk factors in children and adolescent might be appropriate. In contrast, increasing the levels of physical activity, especially moderate-to-vigorous physical activity (MVPA) has a beneficial effect on elevated cardiometabolic risk factors. 6 , 7 To date, few studies have investigated how different

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Matthew Pearce, David H. Saunders, Peter Allison and Anthony P. Turner

The UK Government advises that children and young people aged 5–18 years should participate in structured and unstructured activities throughout the day to achieve the recommended 60 daily minutes of moderate to vigorous physical activity (MVPA). Physical activity of this intensity stimulates the

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Joey C. Eisenmann, R. Todd Bartee and Krystal D. Damori

Purpose:

The purposes of this study were (a) to describe the prevalence of participation in moderate to vigorous physical activity (MVPA) and overweight and obesity, and (b) to examine the associations between physical activity and weight status in a sample of university students from a rural university.

Methods:

Data from a representative sample of 773 (361 women, 412 men) students participating in the National College Health Assessment Survey were examined. MVPA and height and body mass were self-reported. The body-mass index (BMI) was derived and used to classify subjects as normal, overweight, or obese.

Results:

Approximately 20% of students were inactive (0 d/wk), and 23% met the recommended amount of MVPA (≥5 d/wk). Prevalence of overweight and obesity was, respectively, 35.7% and 8.5% in men and, respectively, 15.6% and 8.2% in women. Analysis of variance revealed the mean BMI was not significantly different across levels of MVPA. Odds ratios showed higher levels of MVPA were significantly associated with lower risk of obesity in men but not women.

Conclusion:

A large percentage of subjects are inactive or insufficiently active, and self-reported moderate to vigorous physical activity is significantly related to risk of obesity in men. Future studies should measure habitual physical activity or energy expenditure and body composition. Additional factors affecting obesity, such as television viewing and other sedentary behaviors, dietary intake, and heritability, should also be considered.

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Eric E. Wickel, Joey C. Eisenmann and Gregory J. Welk

Background:

This study compared physical activity levels among early, average, and late maturing boys and girls.

Methods:

Physical activity was assessed with an Actigraph accelerometer in 161 (76 boys, 85 girls) 9 to 14 year olds over 7 consecutive days. Anthropometric variables were measured and the maturity offset (ie, years from peak height velocity) was predicted. Biological maturity groups (early, average, and late) were created based on the mean estimated age at peak height velocity for boys and girls separately.

Results:

Levels of moderate-to-vigorous physical activity (MVPA) were similar between early, average, and late maturing boys and girls after adjusting for differences in chronological age. Levels of MVPA progressively declined across chronological age in boys and girls (P < .001) and gender differences existed at 10-, 12-, and 13-years, with boys having higher levels than girls (P < .05). When aligned according to biological age, gender-related differences in MVPA did not exist.

Conclusions:

Within this sample of 9 to 14 year old boys and girls, there were no significant differences in MVPA among early, average, and late maturing individuals.

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Rachel E. Klaren, Jeffer E. Sasaki, Edward McAuley and Robert W. Motl

Background:

Physical inactivity is common in persons with multiple sclerosis (MS), but there is very little known about the pattern and predictors of changes in physical activity over time.

Purpose:

This study examined changes in moderate-to-vigorous physical activity (MVPA) over a 30-month time period and the demographic and clinical predictors of such changes in relapsing-remitting MS (RRMS).

Methods:

269 persons with MS wore an accelerometer for a 7-day period and completed a demographic/clinical scale every 6 months over a 30-month period. Data were analyzed using latent class growth modeling (LCGM).

Results:

LCGM identified a two-class model for changes in levels of MVPA over time. Class 1 involved higher initial levels of MVPA and linear decreases in MVPA over time, whereas Class 2 involved lower initial levels of MVPA and linear increases in MVPA over time. LCGM further indicated that males were more likely (OR = 5.8, P < .05) and those with higher disability status were less likely (OR = 0.51, P < .05) to belong to Class 1 than Class 2.

Conclusion:

Levels of MVPA change over time in persons with RRMS and the pattern of change suggests that behavioral physical activity interventions for persons with MS might target men and those with lower disability.

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Tiego A. Diniz, Fabricio E. Rossi, Clara Suemi da Costa Rosa, Jorge Mota and Ismael F. Freitas-Junior

The objective of this study was to compare moderate-to-vigorous physical activity (MVPA), minutes per week (min/wk), and fulfillment of the current recommendation (150 min/wk of MVPA) based on different cut-points in postmenopausal women. The sample was composed of 233 postmenopausal women aged 59.8 ± 6.7 years old. MVPA was measured using triaxial accelerometers. Accelerometers were initialized to collect in 60-s epochs. Participants were included if using at least 5 days. MVPA min/wk were obtained using Freedson, Troiano, Copeland, and Sasaki cut-points. Box-plot indicated large mean differences between almost all cut-points, except for Freedson and Troiano (9.3 [95% LoA: –5.6; 24.3] min/wk). The proportion of women who achieved 150 min/wk of MVPA was similar between Freedson and Troiano (31% vs. 30%). Sasaki and Copeland cut-points resulted in a greater proportion than other cut-points. We concluded that the cut-points analyzed generated different results in MVPA min/wk and low agreement when using current guidelines for MVPA pattern classification, except for the comparisons between Freedson and Troiano cut-points.