At the Mercy of the Gods: Associations Between Weather, Physical Activity, and Sedentary Time in Children

2016 ◽  
Vol 28 (1) ◽  
pp. 152-163 ◽  
Author(s):  
Lucy Kate Lewis ◽  
Carol Maher ◽  
Kevin Belanger ◽  
Mark Tremblay ◽  
Jean-Philippe Chaput ◽  
...  
Keyword(s):  
Physical Activity ◽  
Mixed Model ◽  
Sedentary Time ◽  
Vigorous Physical Activity ◽  
Weather Conditions ◽  
Weather Data ◽  
Maximum Temperature ◽  
Daily Maximum Temperature ◽  
Daily Maximum ◽  
Cross Sectional

Objectives:This study investigated associations between weather conditions, physical activity, and sedentary time in primary school-aged children in Australia and Canada.Methods:Cross-sectional data on 9–11-year-old children from the Australian (n = 491) and Canadian (n = 524) sites of the International Study of Childhood Obesity, Lifestyle and the Environment were used. Minutes of daily moderate-to-vigorous-physical-activity (MVPA) and sedentary time were determined from 7-day, 24-h accelerometry (Actigraph GT3X+ triaxial accelerometer). Day-matched weather data (temperature, rainfall, snowfall, relative humidity, wind speed) were obtained from the closest weather station to participants’ schools. Covariates included parental highest education level, day type, sex, and BMI z-scores. Generalized mixed model analyses allowing for clustering of participants within schools were completed. Scatterplots with Loess curves were created for maximum temperature, MVPA, and sedentary time.Results:Daily maximum temperature was significantly associated with MVPA and sedentary time in Australia (MVPA p = .05, sedentary p = .01) and Canada (p < .001, p = .001). Rainfall was negatively associated with MVPA in Australia (p < .001) and positively associated with sedentary time in Canada (p = .02).Conclusions:MVPA and sedentary time appear to be optimal when the maximum temperature ranges between 20°C and 25°C in both countries. The findings have implications for study design and interpretation for surveillance and intervention studies.

Daily Variations in Weather and the Relationship With Physical Activity and Sedentary Time in European 10- to 12-Year-Olds: The ENERGY-Project

2014 ◽  
Vol 11 (2) ◽  
pp. 419-425 ◽  
Author(s):  
Mine Yildirim ◽  
Anna Schoeni ◽  
Amika S. Singh ◽  
Teatske M. Altenburg ◽  
Johannes Brug ◽  
...  
Keyword(s):  
Physical Activity ◽  
Regression Models ◽  
Sedentary Time ◽  
Weather Data ◽  
Maximum Temperature ◽  
Multilevel Regression ◽  
Cross Sectional ◽  
Daily Variations ◽  
Data Analyses ◽  
The Relationship

Background:The aim of the study was to examine the association of daily variations in rainfall and temperature with sedentary time (ST) and physical activity (PA) in European children.Methods:Children were included from 5 countries (Belgium, Greece, Hungary, the Netherlands, Switzerland) as part of the ENERGY-project. We used cross-sectional data from 722 children aged 10–12 years (47% boys). ST and PA were measured by accelerometers for 6 consecutive days, including weekend days. Weather data were collected from online national weather reports. Multilevel regression models were used for data analyses.Results:Maximum temperature was positively associated with light PA (β = 3.1 min/day; 95% CI = 2.4–3.8), moderate-to-vigorous PA (β = 0.6 min/day; 95% CI = 0.4–0.8), and average PA [β = 4.1 counts per minute (cpm); 95% CI = 1.6–6.5, quadratic relationship]. Rainfall was inversely and quadratically associated with light PA (β = –1.3 min/day; 95% CI = –1.9 to –0.6), moderate-to-vigorous PA (β = –0.6 min/day; 95% CI = –0.8 to –0.3), and average PA (β = –1.6 cpm; 95% CI = –2.2 to –0.9). Maximum temperature was not significantly associated with ST (β = –0.2 min/day; 95% CI = –1.0 to 0.6), while rainfall was positively associated with ST (β = 0.9 min/day; 95% CI = 0.6–1.3).Conclusion:The current study shows that temperature and rainfall are significantly associated with PA and ST in 10- to 12-year-old European children.

scholarly journals Objectively Measured Physical Activity and Sedentary Time among Children and Adolescents in Morocco: A Cross-Sectional Study

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Issad Baddou ◽  
Asmaa El Hamdouchi ◽  
Imane El Harchaoui ◽  
Kaoutar Benjeddou ◽  
Naima Saeid ◽  
...  
Keyword(s):  
Physical Activity ◽  
Children And Adolescents ◽  
Cardiovascular Health ◽  
Sedentary Time ◽  
Vigorous Physical Activity ◽  
Physical Activity Guideline ◽  
Activity Levels ◽  
Cross Sectional ◽  
Physical Activity Levels ◽  
Objectively Measured

Background. Regular physical activity in childhood and adolescent plays an important role in reducing the risk of cardiovascular health diseases, diabetes, and obesity in adulthood. However, little is known about physical activity levels (PA) and sedentary time among children and adolescents in Morocco. Objective. To examine gender, type of day, and age grade differences in objectively measured sedentary time, physical activity levels, and physical activity guideline attainment among children and adolescents in Morocco. Method. 172 children/adolescents (mean age = 10.92 ± 1.55 years, 49.4% are boys) were recruited for this study and wore a tri-axial accelerometer (GT3X+) for 7 consecutive days. Time spent in sedentary, PA levels, and daily steps were measured and compared according to gender, age grade, and the type of day (weekdays/weekends). Results. In weekdays children/adolescents spent more time in sedentary than weekends (p < 0.001). Boys were eight times more likely to meet the recommendation for at least 60 min of moderate to vigorous physical activity per day than girls (OR: 8.569; 95% [CI]: 4.23–17.32), p < 0.001. Conclusion. These findings highlight the need for effective and sustainable strategies and programs aiming to promote physical activity and to reduce sedentary behavior among children and adolescents in Morocco.

Exploring Preschoolers’ Physical Activity and Sedentary Time During Outdoor Play at Childcare: A Cross-Sectional Analysis of the Supporting Physical Activity in the Childcare Environment Study

2021 ◽  
pp. 1-8
Author(s):  
Brianne A. Bruijns ◽  
Leigh M. Vanderloo ◽  
Brian W. Timmons ◽  
Patricia Tucker
Keyword(s):  
Physical Activity ◽  
Sedentary Time ◽  
Vigorous Physical Activity ◽  
Outdoor Play ◽  
Control Group ◽  
Activity Levels ◽  
Cross Sectional ◽  
Environment Study ◽  
Sectional Analysis ◽  
Experimental Group

Background: Moderate-to-vigorous physical activity (MVPA) offers many health benefits for preschoolers (2.5–5 y). In childcare, MVPA is predominantly accumulated outdoors, with higher rates purported among children within the first few minutes outside. The Supporting Physical Activity in the Childcare Environment intervention included shorter, more frequent outdoor play sessions; this study sought to explore children’s activity levels during various outdoor play schedules. Methods: During the final week of the Supporting Physical Activity in the Childcare Environment intervention, preschoolers wore an Actical™ accelerometer for 5 days during childcare and staff logged outdoor times. Separate linear mixed effects models were run to explore the effect of the intervention on preschoolers’ physical activity (total and MVPA) and sedentary time during outdoor play. Sex was entered as an interaction effect. Results: Preschoolers (n = 292) were significantly more active in the first 10 minutes outdoors compared with remaining time (P < .0083). For total outdoor time, children in the experimental group engaged in significantly less sedentary time than those in the control group (P < .017), and experimental group boys and girls engaged in higher MVPA than boys and girls in the control group (P < .017). Conclusions: Findings support scheduling more frequent outdoor play sessions in childcare to increase physical activity participation among young children.

The differing impact of air stagnation on near-surface ozone across Europe

2020 ◽  
Author(s):  
José M. Garrido-Pérez ◽  
Carlos Ordóñez ◽  
Ricardo García-Herrera ◽  
Jordan L. Schnell
Keyword(s):  
Climate Model ◽  
Surface Ozone ◽  
Weather Conditions ◽  
Ozone Production ◽  
Maximum Temperature ◽  
Daily Maximum Temperature ◽  
Daily Maximum ◽  
Southern Europe ◽  
Near Surface ◽  
Photochemical Production

&lt;p&gt;Daily maximum temperature is known to be the meteorological variable that mostly controls the afternoon near-surface ozone concentrations during summer. Air stagnation situations, characterised by stable weather conditions and poor ventilation, also lead to the accumulation of pollutants and regional ozone production close to the surface. This work evaluates the joint effect of daily maximum temperature and a simplified air stagnation index on surface ozone observations in eight regions of Europe during summer 1998-2015.&lt;/p&gt;&lt;p&gt;As expected, the correlations of MDA8 O&lt;sub&gt;3&lt;/sub&gt; (maximum daily 8-h running average ozone) with temperature are higher than with stagnation for most regions. Nevertheless, stagnation can also be considered as a good predictor of ozone, especially in the regions of central/southern Europe, where the correlation coefficients between MDA8 O&lt;sub&gt;3&lt;/sub&gt; and the percentage of stagnant area are within the range 0.50&amp;#8211;0.70. MDA8 O&lt;sub&gt;3&lt;/sub&gt; consistently increases over central/southern Europe under stagnant conditions, but this is not always the case in the north. Under non-stagnant conditions and daily maximum temperatures within 20-25 &amp;#186;C (typical temperatures of fair weather conditions that allow photochemical production), northern Europe is affected by southerly advection that often brings aged air masses from more polluted areas, increasing the MDA8 O&lt;sub&gt;3&lt;/sub&gt; mixing ratios.&lt;/p&gt;&lt;p&gt;We have also found that the ozone diurnal cycles in the central/southern regions exhibit large amplitudes, with above-average daytime and below-average night-time concentrations, when stagnation occurs. Stagnant nights are often associated with stable shallow planetary boundary layer and, presumably, enhanced dry deposition and chemical destruction of ozone. After sunrise, mixing with air from air from the residual layer, accumulation of ozone and precursors, and photochemical production seem to be the main mechanisms involved in the build-up of daytime ozone.&lt;/p&gt;&lt;p&gt;According to previous studies, some of the central/southern European regions where stagnation has a clear impact on ozone have undergone significant upward trends in air stagnation in the past and are also likely to experience increases in the future. However, our study has identified other regions with unclear responses of summer ozone to the occurrence of stagnation. This indicates that climate model projections of increases in stagnation should not directly be translated into enhanced summer ozone pollution if the sensitivity of this pollutant to stagnation has not been proved for a particular region.&lt;/p&gt;

scholarly journals Associations Between Home Environment and After-School Physical Activity and Sedentary Time Among 6th Grade Children

2015 ◽  
Vol 27 (2) ◽  
pp. 226-233 ◽  
Author(s):  
Erica Y. Lau ◽  
Daheia J. Barr-Anderson ◽  
Marsha Dowda ◽  
Melinda Forthofer ◽  
Ruth P. Saunders ◽  
...  
Keyword(s):  
Physical Activity ◽  
Home Environment ◽  
Parental Support ◽  
Physical Environment ◽  
Mixed Model ◽  
Sedentary Time ◽  
Vigorous Physical Activity ◽  
Total Physical Activity ◽  
After School ◽  
Time Availability

This study examined associations of various elements of the home environment with after-school physical activity and sedentary time in 671 6th-grade children (Mage = 11.49 ± 0.5 years). Children’s after-school total physical activity, moderate-to-vigorous physical activity, and sedentary time were measured by accelerometry. Parents completed surveys assessing elements of the home social and physical environment. Mixed-model regression analyses were used to examine the associations between each element of the home environment and children’s after-school physical activity and sedentary time. Availability of home physical activity resources was associated positively with after-school total physical activity and negatively with after-school sedentary time in boys. Parental support was associated positively with after-school total physical activity and MVPA and negatively with after-school sedentary time in girls. The home physical environment was associated with boys’ after-school physical activity and sedentary time, whereas the home social environment was associated with girls’ after-school physical activity and sedentary time.

scholarly journals Frequency of compound hot-dry weather extremes has significantly increased in Australia since 1889

2021 ◽  
Author(s):  
Brian Collins
Keyword(s):  
Temporal Variations ◽  
Nonparametric Tests ◽  
Weather Data ◽  
Maximum Temperature ◽  
Daily Maximum Temperature ◽  
Daily Maximum ◽  
Grid Cells ◽  
Weather Extremes ◽  
Spatial Homogeneity ◽  
Daily Weather Data

There is high confidence that climate change has increased the probability of concurrent temperature-precipitation extremes, changed their spatial-temporal variations, and affected the relationships between drivers of such natural hazards. However, the extent of such changes has been less investigated in Australia. Daily weather data (131 years, 1889-2019) at 700 grid cells (1◦ &times; 1◦) across Australia was obtained to calculate annual and seasonal mean daily maximum temperature (MMT) and total precipitation (TPR). A nonparametric multivariate copula framework was adopted to estimate the return period of compound hot-dry (CHD) events based on an &lsquo;And&rsquo; hazard scenario (hotter than a threshold &lsquo;And&rsquo; drier than a threshold). CHD extremes were defined as years with joint return periods of larger than 25 years. Mann-Kendall nonparametric tests was used to analyse trends in MMT and TPR as well as in the frequency of univariate and CHD extremes. A general cooling-wetting trend was observed over 1889-1989. Significant increasing trends were detected over 1990-2019 in the frequency and severity of hot extremes across the country while trends in dry extremes were mostly insignificant (and decreasing). Results showed a significant increase in the association between temperature and precipitation at various temporal scales. The frequency of CHD extremes was mostly stable over 1889-1989, but significantly increased between 1990 and 2019 at 44% of studied grid cells, mostly located in the north, south-east and south-west. Spatial homogeneity (i.e. connectedness) and propagation of extreme events from one grid cell to its neighbouring cells was investigated across Australia. It can be concluded that this connectedness has not significantly changed since 1889.

Associations Between 24-Hour Time Use and Academic Achievement in Australian Primary School–Aged Children

2020 ◽  
Vol 47 (6) ◽  
pp. 905-913
Author(s):  
Amanda Watson ◽  
Dorothea Dumuid ◽  
Tim Olds
Keyword(s):  
Physical Activity ◽  
Academic Achievement ◽  
Daily Activity ◽  
Sedentary Time ◽  
Standardized Test ◽  
Vigorous Physical Activity ◽  
Pubertal Development ◽  
Compositional Data Analysis ◽  
Individual Activity ◽  
Cross Sectional

Background Previous research has examined associations between individual activity behaviors and academic achievement. Yet activity behaviors should be analyzed together because they are codependent parts of the 24-hour day. Aims This study aims to explore the associations between all daily activity behaviors (sleep, sedentary time, light physical activity [LPA], and moderate-to-vigorous physical activity [MVPA]) and academic achievement using compositional data analysis. Method Participants for this study were drawn from two cohorts: the Australian arm of the cross-sectional International Study of Childhood Obesity, Lifestyle and the Environment ( n = 452; mean age 10.7 years ( SD = 0.4); 54% female) and CheckPoint ( n = 1278; mean age 12 years [ SD = 0.4]; 50% female), a cross-sectional study nested between Waves 6 and 7 of the Longitudinal Study of Australian Children. Objective daily activity behavior data (sleep, sedentary time, LPA, and MVPA) were collected using 8-day, 24-hour accelerometry. Academic achievement was assessed using a nationally administered standardized test in literacy (spelling, grammar and punctuation, writing and reading) and numeracy. Compositional models (adjusted for age, sex, socioeconomic position, and pubertal development) regressed academic scores against isometric log ratios of activity behaviors. We used the models to estimate academic achievement for observed daily activity mixes. Estimated outcomes were plotted against time spent in each individual activity domain, and loess curves were fitted. Discussion and conclusion In two different cohorts using two different accelerometers, lower LPA was related to better numeracy and literacy and higher sedentary time to better literacy (relative to time spent in other domains). Discussion and conclusion. LPA likely “drains time” from other movement behaviors, which are beneficial for academic achievement.

PSVI-6 Thresholds of Outdoor Temperatures on Fertility Measures of Different Parity Sows in Spanish Herds

2021 ◽  
Vol 99 (Supplement_1) ◽  
pp. 217-217
Author(s):  
Ryosuke Iida ◽  
Carlos Piñeiro ◽  
Yuzo Koketsu
Keyword(s):  
Mixed Model ◽  
Generalized Least Squares ◽  
Maximum Temperature ◽  
Daily Maximum Temperature ◽  
Daily Maximum ◽  
Lactating Sows ◽  
Mating Interval ◽  
Ventilation Rates ◽  
Best Fit ◽  
Farrowing Rate

Abstract High temperature is one of the environmental factors which impair sow fertility such as weaning-to-first-mating interval (WMI) and farrowing rate especially in parity 1 sows. The objective of this study was to explore thresholds of temperature damaging fertility in different parity sows. Data of sows serviced from 2011 to 2016 in 142 herds were coordinated with daily maximum temperature (Tmax) from 31 weather stations close to the herds. A two-stage approach was used to determine the best fit model. In the first stage, means and their variance-covariance matrix in each degree Celsius were estimated by a mixed model. Then, piecewise models with a different breakpoint were fitted to the estimates by generalized least squares. Medians of WMI in parity 1 and 2 or higher sows were 5 and 4 days, respectively. Farrowing rates in different parity sows were 85.0–88.7%. The thresholds of mean Tmax during lactation leading to a prolonged WMI were 16 and 23–25°C for parity 1 and 2 higher sows, respectively. The 10°C increase in Tmax from the thresholds delayed WMI in parity 1 and 2 or higher sows by 0.62 and 0.46–0.49 days, respectively (P &lt; 0.01). Meanwhile, the thresholds of mean Tmax from 21 to 14 days before service leading to reductions in farrowing rate were 21, 19 and 21–22°C for parity 0, 1 and 2 or higher sows, respectively. As the Tmax increased by 10°C from the thresholds, farrowing rate in parity 0–1 and 2 or higher sows decreased by 2.9 and 2.2–2.6%, respectively (P &lt; 0.01). Lactating sows in parity 1 suffered from heat stress at a relatively low outdoor temperature. This implies that the temperature is warmer in lactating barns than in outdoor. We recommend changing thermostat set at barns in spring from those in winter in order to increase ventilation rates earlier.

Goldilocks Days: optimising children’s time use for health and well-being

2021 ◽  
pp. jech-2021-216686
Author(s):  
Dorothea Dumuid ◽  
Timothy Olds ◽  
Katherine Lange ◽  
Ben Edwards ◽  
Kate Lycett ◽  
...  
Keyword(s):  
Physical Activity ◽  
Time Use ◽  
Sedentary Time ◽  
Vigorous Physical Activity ◽  
Well Being ◽  
Psychosocial Health ◽  
Light Physical Activity ◽  
Cross Sectional ◽  
Interactive Interface ◽  
Nationally Representative

BackgroundOne size rarely fits all in population health. Differing outcomes may compete for best allocations of time. Among children aged 11–12 years, we aimed to (1) describe optimal 24-hour time use for diverse physical, cognitive/academic and well-being outcomes, (2) pinpoint the ‘Goldilocks Day’ that optimises all outcomes and (3) develop a tool to customise time-use recommendations.MethodsIn 2004, the Longitudinal Study of Australian Children recruited a nationally-representative cohort of 5107 infants with biennial follow-up waves. We used data from the cross-sectional Child Health CheckPoint module (2015–2016, n=1874, 11–12 years, 51% males). Time use was from 7-day 24-hour accelerometry. Outcomes included life satisfaction, psychosocial health, depressive symptoms, emotional problems, non-verbal IQ; vocabulary, academic performance, adiposity, fitness, blood pressure, inflammatory biomarkers, bone strength. Relationships between time use and outcomes were modelled using compositional regression.ResultsOptimal daily durations varied widely for different health outcomes (sleep: 8.3–11.4 hours; sedentary: 7.3–12.2 hours; light physical activity: 1.7–5.1 hours; moderate-to-vigorous physical activity (MVPA): 0.3–2.7 hours, all models p≤0.04). In general, days with highest physical activity (predominantly MVPA) and low sedentary time were optimal for physical health, while days with highest sleep and lowest sedentary time were optimal for mental health. Days with highest sedentary time and lowest physical activity were optimal for cognitive health. The overall Goldilocks Day had 10 hours 21 min sleep, 9 hours 44 min sedentary time, 2 hours 26 min light physical activity and 1 hour 29 min MVPA. Our interactive interface allows personalisation of Goldilocks Days to an individual’s outcome priorities.Conclusion‘Goldilocks Days’ necessitate compromises based on hierarchies of priorities for health, social and economic outcomes.

scholarly journals Cross-Sectional and Longitudinal Associations between Non-School Time Physical Activity, Sedentary Time, and Adiposity among Boys and Girls: An Isotemporal Substitution Approach

2021 ◽  
Vol 18 (9) ◽  
pp. 4671
Author(s):  
Kelsey L. McAlister ◽  
Jennifer Zink ◽  
Daniel Chu ◽  
Britni R. Belcher ◽  
Genevieve F. Dunton
Keyword(s):  
Physical Activity ◽  
Sedentary Time ◽  
Vigorous Physical Activity ◽  
Behavioral Approach ◽  
Cross Sectional ◽  
Time Activity ◽  
School Time ◽  
Longitudinal Associations ◽  
The Cross

This study investigated the cross-sectional and longitudinal associations of the substitution of non-school time light physical activity (LPA), moderate-to-vigorous physical activity (MVPA), and sedentary time (ST) with adiposity in boys and girls. Boys (n = 65, baseline Mage= 9.93 ± 0.86 years) and girls (n = 77, baseline Mage = 10.17 ± 0.95 years) wore waist-worn accelerometers (ActiGraph GT3X) at baseline and at a 30-month follow-up, from which non-school time LPA, MVPA, ST, and total device wear were quantified. Body mass index (BMI) and waist-to-height-ratio (WHR) were measured at baseline and follow-up. Body fat percent (BF%) was obtained at follow-up only. Isotemporal substitution models assessed the cross-sectional and longitudinal associations of reallocating non-school time activity with BMI, WHR and BF%. In boys, replacing 30 min/day of LPA with MVPA was cross-sectionally (β = −8.26, p < 0.05) associated with a lower BF%. Replacing 30 min/day of ST with MVPA was cross-sectionally (β = −6.02, p < 0.05) associated with a lower BF% in boys. Longitudinally in boys, replacing 30 min of change in LPA with MVPA (β = −7.42, p < 0.10) and replacing 30 min of change in MVPA with ST (β = 5.78, p < 0.10) over 30 months was marginally associated with less BF%. Associations were null in girls (p > 0.05). These results may support targeting activity reallocation during non-school time for the purposes of adiposity improvement in boys. A multi-behavioral approach may be more appropriate for girls, as non-school time activity may not be driving adiposity status.

Sign in / Sign up

Export Citation Format

Share Document