Isotemporal Substitution Analysis for Sedentary Behavior and Body Mass Index

Huang, Wendy Yajun; Wong, Stephen H.; He, Gang; Salmon, J.

doi:10.1249/mss.0000000000001002

Cited by 40 publications

(56 citation statements)

References 36 publications

(49 reference statements)

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“…No statistical associations were found in prospective studies ; however, pooled analysis shows a negative trend towards statistical significant associations of replacing sedentary behavour with MVPA on BMI ( β = −0.154, 95% CI, −0.344 to 0.037; p = 0.113; I 2 = 88.3%). The lack of significant association may be due to limited number of studies.…”

Section: Discussionmentioning

confidence: 81%

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Reallocating sedentary time to moderate‐to‐vigorous physical activity but not to light‐intensity physical activity is effective to reduce adiposity among youths: a systematic review and meta‐analysis

et al. 2017

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The aim of the study was to summarize the evidence of the effects of reallocating time spent in sedentary behaviours in different activity intensities on youth's adiposity. Five databases were searched. Studies that reported the effects of replacing sedentary behaviour with light-intensity physical activity (LIPA) and/or moderate-to-vigorous physical activity (MVPA) on at least one adiposity parameter. The estimated regression coefficients (β) and 95% CIs were combined and meta-analysed. Data from 7,351 youths and five studies were analysed. Pooled analysis from cross-sectional studies shows that replacing sedentary time with LIPA showed no significant associations with any adiposity-related outcomes. Replacing sedentary time with MVPA was statistically associated with total body fat percentage (β = -2.512; p = 0.003), but not with body mass index or waist circumference. In subgroup analysis, the greatest magnitude of association was observed from studies where 60 min of sedentary behaviour was reallocated to 60 min of MVPA (β = -4.535; p < 0.001). Our results highlight the importance of promoting MVPA, which may improve body composition phenotypes in young people. This information can be used to develop more effective lifestyle interventions.

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Section: Discussionmentioning

confidence: 81%

“…All studies included in the current meta‐analysis were cross‐sectional and/or prospective observational in nature. Table summarizes the characteristics of the studies.…”

Section: Resultsmentioning

confidence: 99%

Reallocating sedentary time to moderate‐to‐vigorous physical activity but not to light‐intensity physical activity is effective to reduce adiposity among youths: a systematic review and meta‐analysis

et al. 2017

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“…Seventeen papers included young children (aged 3–12 years or mean age in the period), 20 included only adolescents (13–18 years or mean age in the period), and 5 studies included both age groups. Objective assessment of physical activity was used in nine studies, such as an accelerometer [25, 48, 56, 58–61], a pedometer [53], and heart rate monitoring [35]. The other studies used questionnaires to measure physical activity.…”

Section: Resultsmentioning

confidence: 99%

“…)20(48)[26, 29–32, 35, 38, 40, 41, 45, 46, 49, 51, 52, 54, 55, 61–63, 65] Both (3–18 years. )5(12)[27, 34, 43, 48, 57]Method of PA measurement a Objective measurement of PA9(21) Reported reliability or validity1(2)[25] Mention of original reference3(7)[53, 60, 61] None reported5(12)[35, 48, 56, 58, 59] PA measured by questionnaires35(83) Reported reliability and validity5(12)[28, 33, 35, 40, 56] Reported reliability or validity8(19)[26, 29, 36, 39, 44, 45, 60, 63] Mention of original reference14(33)[27, 31, 32, 34, 37, 41, 42, 46, 47, 50, 52, 54, 62, 65] None reported8(19)[30, 38, 43, 49, 55, 57, 64, 66] a Totals may add up to more than 100%, sinc...…”

Section: Resultsmentioning

confidence: 99%

Factors of physical activity among Chinese children and adolescents: a systematic review

Stolk

Sauer

et al. 2017

Int J Behav Nutr Phys Act

116

106

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BackgroundLack of physical activity is a growing problem in China, due to the fast economic development and changing living environment over the past two decades. The aim of this review is to summarize the factors related to physical activity in Chinese children and adolescents during this distinct period of development.MethodsA systematic search was finished on Jan 10th, 2017, and identified 2200 hits through PubMed and Web of Science. English-language published studies were included if they reported statistical associations between factors and physical activity. Adapted criteria from the Strengthening The Reporting of OBservational studies in Epidemiology (STROBE) statement and evaluation of the quality of prognosis studies in systematic reviews (QUIPS) were used to assess the risk of bias of the included studies. Related factors that were reported in at least three studies were summarized separately for children and adolescents using a semi-quantitative method.ResultsForty two papers (published 2002–2016) were included. Most designs were cross-sectional (79%), and most studies used questionnaires to assess physical activity. Sample size was above 1000 in 18 papers (43%). Thirty seven studies (88%) showed acceptable quality by methodological quality assessment. Most studies reported a low level of physical activity. Boys were consistently more active than girls, the parental physical activity was positively associated with children and adolescents’ physical activity, children in suburban/rural regions showed less activity than in urban regions, and, specifically in adolescents, self-efficacy was positively associated with physical activity. Family socioeconomic status and parental education were not associated with physical activity in children and adolescents.ConclusionsThe studies included in this review were large but mostly of low quality in terms of study design (cross-sectional) and methods (questionnaires). Parental physical activity and self-efficacy are promising targets for future physical activity promotion programmes. The low level of physical activity raises concern, especially in suburban/rural regions. Future research is required to enhance our understanding of other influences, such as the physical environment, especially in early childhood.Electronic supplementary materialThe online version of this article (doi:10.1186/s12966-017-0486-y) contains supplementary material, which is available to authorized users.

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“…A series of partition models and isotemporal substitution models (19) were used for each type of cancer to examine the associations of daily TV screen time, time spent walking/day, time spent in moderate-intensity physical activity/day, time spent in vigorous-intensity physical activity/day and cancer incidence (19,(31)(32)(33)(34). Partition models examined all behaviours simultaneously, without adjusting for total physical activity time.…”

Section: Cancer Ascertainmentmentioning

confidence: 99%

The association between non-occupational TV and computer screen-time viewing and cancer risk: Findings from the UK Biobank, a large prospective cohort study

Hunter¹,

Murray²,

Coleman³

2019

Preprint

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Background Evidence is suggestive of sedentary behaviour being associated with an increased risk of endometrial cancer, but the evidence base is too limited to draw any conclusions for other cancers. The aim of the study was to investigate the association between sedentary behaviour and total cancer incidence and site-specific cancer incidence.Methods This prospective population-based cohort study involved data from the UK Biobank (470 578 adults; 53.8% females; mean age 56.3 years). Sedentary behaviours including television viewing time, computer use time and daily total screen time were the exposure variables. Primary and secondary outcome measures included incident total cancer, and site-specific cancers identified from the International Classification of Diseases, 9th and 10th revisions (ICD-9 and ICD-10). Cox proportional hazards models were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs) showing the relationship between sedentary behaviour and cancer using continuous (hours/day) and categorical exposure variables. Partition models and isotemporal substitution models were used to investigate the impact of substituting sedentary behaviour with physical activity.Results During a mean follow-up time of 7.6 years, 28 992 incident cancers were identified. A 1-hour increase in daily TV screen time was associated with higher risk of oropharyngeal cancer (HR 1.06, 95% CI: 1.02, 1.11), stomach cancer (HR 1.06, 95% CI: 1.001, 1.13), oesophagus and stomach cancer (HR 1.04, 95% CI: 1.005, 1.09), and colon cancer (HR 1.04, 95% CI: 1.01, 1.06) in fully adjusted models. Participants who reported ≤1 hour/day of TV screen time had a lower risk of lung cancer (HR 0.85, 95% CI: 0.73, 0.997), breast (female only) cancer (HR 0.92, 95% CI: 0.85, 0.996), stomach cancer (HR 0.66, 95% CI: 0.45, 0.97), and oesophagus and stomach cancer (HR 0.78, 95% CI: 0.62, 0.98) compared to participants who reported 1-≤3 hours/day of TV screen time. Isotemporal substitution models showed reduced risk of total cancer (HR 0.97, 95% CI: 0.95, 0.99) and some site-specific cancers when replacing 1-hour/day of TV viewing with moderate-intensity physical activity or walking.Conclusions Our findings show that sedentary behaviours were associated with some site-specific cancers (including oropharyngeal, oesophagus and stomach, colon and lung cancer), particularly for TV viewing time. Our findings were less consistent for time spent on computer and daily total screen time. Substitution models showed that replacing 1-hour per day of TV viewing with 1-hour of moderate-intensity physical activity or walking was associated with lower risk of total cancer and lower risk of several site-specific cancers. Health promotion strategies should endorse the message to minimise sedentary behaviour, replacing it with health-enhancing physical activity, and to particularly target TV viewing.

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Isotemporal Substitution Analysis for Sedentary Behavior and Body Mass Index

Abstract: The substitution of screen time or academic-related activities with other sedentary behaviors or MVPA was associated with lower BMI in Chinese children.

Cited by 40 publications

References 36 publications

Reallocating sedentary time to moderate‐to‐vigorous physical activity but not to light‐intensity physical activity is effective to reduce adiposity among youths: a systematic review and meta‐analysis

Reallocating sedentary time to moderate‐to‐vigorous physical activity but not to light‐intensity physical activity is effective to reduce adiposity among youths: a systematic review and meta‐analysis

Factors of physical activity among Chinese children and adolescents: a systematic review

The association between non-occupational TV and computer screen-time viewing and cancer risk: Findings from the UK Biobank, a large prospective cohort study

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