Sedentary Behaviors, Body Fatness and Physical Activity in Youth

Biddle, Stuart J. H.; Marshall, Simon; Gorely, P J.; Cameron, Noël; Murdey, I

doi:10.1097/00005768-200305001-00987

Cited by 8 publications

(8 citation statements)

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“…The 'displacement hypothesis' proposes that sedentary behavior displaces physical activity; however several studies, including ours, only find weak or no associations [9,24,34]. In line with this, we found that boys in the high TV viewers cluster had above average physical exercise levels, and the low sedentary and low physical exercise cluster in girls indicates that a large proportion of girls spends little time on TV viewing and PC use as well as little time on physical exercise.…”

Section: Discussionmentioning

confidence: 79%

Patterns in sedentary and exercise behaviors and associations with overweight in 9–14-year-old boys and girls - a cross-sectional study.

et al. 2007

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Background: Before starting interventions addressing energy-balance related behaviors, knowledge is needed about the prevalence of sedentary behaviors and low physical exercise, their interrelationships, possible gender differences. Therefore this study aimed to describe gender differences in sedentary and physical exercise behaviors and their association with overweight status in children from nine European countries. Additionally, to identify clusters of children sharing the same pattern regarding sedentary and physical exercise behavior and compare these groups regarding overweight status.

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Section: Discussionmentioning

confidence: 79%

Patterns in sedentary and exercise behaviors and associations with overweight in 9–14-year-old boys and girls - a cross-sectional study.

et al. 2007

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“…In young Finns, Tammelin et al [32] found that boys and girls who devoted more than 4 hours per day (h•d −1 ) to TV-watching had respectively a 1.4- to 2.5-fold increased risk of not achieving the appropriate level of MVPA compared to a group watching TV for less than 1 h•d −1 . In contrast, others have postulated that PA and sedentary behaviors should not be considered as opposite ends of the same continuum, as they may be compatible with each other and independent in their relationship to health [33]–[36]. Thus, issuing of recommendations to limit screen-time may not be the best strategy in all countries for increasing adolescent PA levels [37].…”

Section: Introductionmentioning

confidence: 99%

Associations between Screen Time and Physical Activity among Spanish Adolescents

et al. 2011

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BackgroundExcessive time in front of a single or several screens could explain a displacement of physical activity. The present study aimed at determining whether screen-time is associated with a reduced level of moderate to vigorous physical activity (MVPA) in Spanish adolescents living in favorable environmental conditions.Methodology/Principal FindingsA multi-stage stratified random sampling method was used to select 3503 adolescents (12–18 years old) from the school population of Gran Canaria, Spain. MVPA, screen-time in front of television, computer, video game console and portable console was assessed in the classroom by fulfilling a standardized questionnaire. Bivariate and multivariate logistic regression analyses adjusted by a set of social-environmental variables were carried out. Forty-six percent of girls (95% CI±2.3%) and 26% of boys (95% CI±2.1%) did not meet the MVPA recommendations for adolescents. Major gender differences were observed in the time devoted to vigorous PA, video games and the total time spent on screen-based activities. Boys who reported 4 hours•week−1 or more to total screen-time showed a 64% (OR = 0.61, 95% CI, 0.44–0.86) increased risk of failing to achieve the recommended adolescent MVPA level. Participation in organized physical activities and sports competitions were more strongly associated with MVPA than screen-related behaviors.Conclusions/SignificanceNo single screen-related behavior explained the reduction of MVPA in adolescents. However, the total time accumulated through several screen-related behaviors was negatively associated with MVPA level in boys. This association could be due to lower availability of time for exercise as the time devoted to sedentary screen-time activities increases. Participation in organized physical activities seems to counteract the negative impact of excessive time in front of screens on physical activity.

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“…10 Physical activity, the malleable component of energy expenditure, 9,11 has been associated with decreased adiposity among children and adolescents. 12 Sedentary behavior 13 and time spent watching TV, [14][15][16] the most studied form of sedentary behavior, have been associated with increased adiposity. Since TV viewing has been associated with unhealthful dietary behaviors, such as increased consumption of soda, fried foods and snacks, 17 the relationship between TV viewing and increased adiposity could be a function of poor dietary choices while watching television.…”

Section: Introductionmentioning

confidence: 99%

BMI from 3–6 y of age is predicted by TV viewing and physical activity, not diet

et al. 2005

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OBJECTIVE: To investigate whether, diet, physical activity, sedentary behavior or television (TV) viewing predicted body mass index (BMI) among 3-7-y-old children. DESIGN: A triethnic cohort of 3-4-y-old children was followed for 3 y from 1986 to 1989. MEASUREMENTS: BMI was assessed at the beginning and end of each measurement year. Heart rate monitoring and observation were used to assess physical activity. Diet (calories, % calories from fat and carbohydrate), sedentary behavior and TV viewing were assessed by direct observation in each year. A repeated measures regression analysis with year as a factor and BMI at the end of each year as dependent variables was run. Nonsignificant variables were removed in a stepwise backward deletion process and significant interactions graphed. RESULTS: The interactions between minutes of TV viewing per hour and study year and minutes of physical activity per hour and study year were significant (Po0.05). There were also significant main effects for TV viewing, physical activity and BMI from the beginning of the study. The model accounted for 65% of the variance in BMI across the three study years. Plotting the significant interactions demonstrated that physical activity was positively associated with BMI in year 1, and negatively associated in years 2 and 3 with a stronger negative relationship in year 3 than 2. TV viewing became positively associated with BMI during the third study year. CONCLUSION: Physical activity and TV viewing were the only significant predictors (other than baseline BMI) of BMI among a triethnic cohort of 3-4-y-old children followed for 3 y with both physical activity (negatively associated) and TV viewing (positively associated) becoming stronger predictors as the children aged. It appears that 6 or 7 y is a critical age when TV viewing and physical activity may affect BMI. Therefore, focusing on reducing time spent watching television and increasing time spent in physical activity may be successful means of preventing obesity among this age group.

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Sedentary Behaviors, Body Fatness and Physical Activity in Youth

Cited by 8 publications

References 0 publications

Patterns in sedentary and exercise behaviors and associations with overweight in 9–14-year-old boys and girls - a cross-sectional study.

Patterns in sedentary and exercise behaviors and associations with overweight in 9–14-year-old boys and girls - a cross-sectional study.

Associations between Screen Time and Physical Activity among Spanish Adolescents

BMI from 3–6 y of age is predicted by TV viewing and physical activity, not diet

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