Definition, measurement, and health risks associated with sedentary behavior. Intervening to Reduce Sedentary Behaviors and Childhood Obesity among School-Age Youth: A Systematic Review of Randomized Trials A systematic review of school-based interventions targeting physical activity and sedentary behaviour among older adolescents Higher levels of objectively measured sedentary behavior is associated with worse cognitive ability: Two-year follow-up study in community-dwelling older adults Comparison of Actical and activPAL measures of sedentary behaviour in preschool children. A cluster-randomized controlled trial to reduce sedentary behavior and promote physical activity and health of 8-9 year olds: The Transform-Us! Study Results of the Sedentary Intervention Trial in Cardiac Rehabilitation (SIT-CR Study): A pilot randomized controlled trial. Correlates of preschool children’s objectively measured physical activity and sedentary behavior: a cross-sectional analysis of the SPLASHY study Sedentary behavior & health-related quality of life among congestive heart failure patients. Self-monitoring of Physical Activity An Internet-based diabetes self-care intervention tailored to self-efficacy. A Randomised Controlled Trial to Reduce Sedentary Time in Young Adults at Risk of Type 2 Diabetes Mellitus: Project STAND (Sedentary Time ANd Diabetes) Randomised controlled feasibility study of a school-based multi-level intervention to increase physical activity and decrease sedentary behaviour among vocational school students Characteristics of the Spanish- and English-Language Self-Efficacy to Manage Diabetes Scales Standing Up for Student Health: An Application of the Health Action Process Approach for Reducing Student Sedentary Behavior-Randomised Control Pilot Trial. Research priorities for child and adolescent physical activity and sedentary behaviours: an international perspective using a twin-panel Delphi procedure Objectively measured physical activity and sedentary behavior and quality of life indicators in survivors of breast cancer
PURPOSE AND METHODS Although evidence is accumulating that sedentary behavior ( SB ) , independent of moderate-to-vigorous intensity physical activity ( MVPA ) , is associated with cardiometabolic and aging outcomes in adults , several gaps present opportunities for future research . This article reports on the " Research Evidence on Sedentary Behavior " session of the Sedentary Behavior : Identifying Research Priorities workshop , sponsored by the National Heart , Lung , and Blood Institute and the National Institute on Aging , which aim ed to identify priorities in SB research . RESULTS AND CONCLUSIONS A consensus definition of SB has not yet been established , although agreement exists that SB is not simply all behaviors other than MVPA . The two most common definitions are as follows : one based solely on intensity ( < 1.5 metabolic equivalents [ METs ] ) and another which combines low intensity ( ≤1.5 METs ) with a seated or reclining posture . Thus , for the definition of SB , evaluation of whether or not to include a postural component is a research priority . SB assessment method ologies include self-report and objective measurement , each offering distinct information . Therefore , evaluation , st and ardization , and comparison across self-report and objective assessment methods are needed . Specific priorities include the development and validation of novel devices capable of assessing posture and st and ardization of research practice s for SB assessment by accelerometry . The prospect i ve evidence that SB relates to health outcomes is limited in that SB is almost exclusively measured by self-report . The lack of longitudinal studies with objective ly measured SB was recognized as a major research gap , making examination of the association between objective ly measured SB and adverse health outcomes in longitudinal studies a research priority . Specifically , studies with repeated measures of SB , evaluating dose-response relationships , with inclusion of more diverse population s are needed Objective . To assess the effectiveness of interventions that focus on reducing  sedentary behavior ( SB ) among school-age youth and to identify elements associated with interventions ' potential for translation into practice setting s. Methods . A comprehensive literature search was conducted using 4 data bases for peer- review ed studies published between 1980 and April 2011 . R and omized trials , which lasted at least 12 weeks , aim ed at decreasing  SB among children aged 6 to 19 years were identified . Results . Twelve studies were included ; 3 focused only on SB , 1 focused on  physical activity ( PA )  , 6 were combined SB and PA interventions , and 2 studies targeted SB , PA , and diet .  The majority of the studies were conducted in a school setting , while others were conducted in such setting s as clinics , community centers , and libraries . Conclusions . Overall , interventions that focused on decreasing SB were associated with reduction in time spent on SB and /or improvements in anthropometric measurements related to childhood obesity . Several of the studies did consider elements related to the intervention 's potential for translation into practice setting ABSTRACT Lack of  physical activity  (  PA  ) and high levels of sedentary behaviour ( SB ) have been associated with health problems . This systematic review evaluates the effectiveness of school-based interventions to increase PA  and decrease SB  among 15–19-year-old adolescents , and examines whether intervention characteristics ( intervention length , delivery mode and intervention provider ) and intervention content ( i.e. behaviour change techniques , BCTs ) are related to intervention effectiveness . A systematic search of r and omised or cluster r and omised controlled trials with outcome measures of PA and /or SB rendered 10 results . Risk of bias was assessed using the Cochrane risk of bias tool . Intervention content was coded using Behaviour Change Technique Taxonomy v1 . Seven out of 10 studies reported significant increases in PA . Effects were generally small and short-term ( Cohen 's d ranged from 0.132 to 0.659 ) . Two out of four studies that measured SB reported significant reductions in SB . Interventions that increased PA  included a higher number of BCTs , specific BCTs ( e.g. , goal setting , action planning and self-monitoring ) , and were delivered by research staff . Intervention length and mode of delivery were unrelated to effectiveness . More studies are needed that evaluate long-term intervention effectiveness and target SBs among older adolescents Background : A number of cross‐sectional studies have suggested that higher levels of  sedentary behavior ( SB ) are associated with worse cognitive abilities  in older age . There is a paucity of longitudinal studies investigating this relationship utilizing objective ly assessed SB . This study investigated the relationship between objective ly assessed SB and future cognitive abilities in a cohort of older adults . Methods : A longitudinal study over 22.12 ± 1.46 months including 285 community‐dwelling older adults across 14 regions in Taiwan was undertaken . Cognitive ability was ascertained using a Chinese version of the Ascertain Dementia 8‐item Question naire ( AD8 ) and SB captured by 7 days accelerometer data . Multivariable negative binomial regression models adjusted for confounders were undertaken . Results : 274 community‐dwelling older adults finished the study ( age = 74.6 ± 6.2 , % female = 54.4 % ) . At baseline , 20.1 % ( n = 55 ) , 48.5 % ( n = 133 ) and 31.4 % ( n = 86 ) of the sample engaged in high ( 11 + h ) , medium ( 7–10.99 h ) and low ( < 7 h ) of SB respectively . In the fully adjusted model , higher levels of SB were associated with an increased risk of worse cognitive ability at follow up ( adjusted rate ratio (ARR)1.09 ( 95%CI:1.00–1.19 ) ) , with the strongest relationship evident in those engaging in over 11 h of SB ( ARR 2.27 ( 95%CI:1.24–4.16 ) ) . The relationship remained evident after adjusting for depressive symptoms and physical activity . Conclusion : Our data suggests that objective ly assessed SB , particularly when over 11 h a day , is independently associated with worse cognitive ability over a two year period . Our data adds to the pressing reasons to reduced SB in older age . HighlightsFirst prospect i ve study to investigate objective  ly sedentary behavior ( SB ) and cognition in older adults . Higher levels of objective SB were independently associated with worse cognitive ability over two years . This relationship was most pronounced in older people spending over 11 h a day being sedentary OBJECTIVES The purpose of this study was to examine the convergent validity of the Actical and activPAL to measure  sedentary behaviour ( SB ) and non-SB in preschoolers in a free-living environment . DESIGN A convenience sample of 49 preschoolers ( 22 boys ; 4.0 ± 0.5 years ) from six early childhood centres in Auckl and , New Zeal and were included in data analysis . METHODS Participants wore a hip-mounted Actical and a thigh-mounted activPAL accelerometer simultaneously during centre attendance for one day and data were collected in 15s epochs . Bl and -Altman tests were used to assess differences in group mean minutes and percentage of time in (non-)SB between both monitors . Agreement between binary coded ( SB vs. non-SB ) 15s-by-15s Actical and activPAL data was evaluated by calculating percentage agreement and κ statistic . RESULTS The monitors were worn on average for 294.8 ± 46.3 min result ing in a total of 57,780 15s epochs . Bl and -Altman tests suggested a small group mean difference in (non-)SB ( 1.3 min ; 0.1 % ) and a wide prediction interval ( 121.3 min ; 39.2 % ) . No obvious systematic bias was observed in the Bl and -Altman plot . Percentage agreement between the 15s-by-15s Actical and activPAL data of all participants was 73.0 % ( inter-child range : 36.8 - 93.8 % ) . The κ statistic showed moderate agreement with a value of 0.46 ( 95 % CI : 0.45 - 0.47 ) . CONCLUSIONS Although the group mean estimate of (non-)SB was similar between the Actical and activPAL , the output of both monitors can not be considered convergent as meaningful r and om disagreement was found between both monitors Background Physical activity ( PA ) is associated with positive cardio-metabolic health and emerging evidence suggests sedentary behavior ( SB ) may be detrimental to children 's health independent of PA . The primary aim of the Transform-Us ! study is to determine whether an 18-month , behavioral and environmental intervention in the school and family setting s results in higher levels of PA and lower rates of SB among 8 - 9 year old children compared with usual practice ( post-intervention and 12-months follow-up ) . The secondary aims are to determine the independent and combined effects of PA and SB on  children 's cardio-metabolic health risk factors ; identify the factors that mediate the success of the intervention ; and determine whether the intervention is cost-effective . Methods / design A four-arm cluster-r and omized controlled trial ( RCT ) with a 2 × 2 factorial design , with schools as the unit of r and omization . Twenty schools will be allocated to one of four intervention groups , sedentary behavior ( SB-I ) , physical activity ( PA-I ) , combined SB and PA ( SB+PA-I ) or current practice control ( C ) , which will be evaluated among approximately 600 children aged 8 - 9 years in school year 3 living in Melbourne , Australia . All children in year 3 at intervention schools in 2010 ( 8 - 9 years ) will receive the intervention over an 18-month period with a maintenance ' booster ' delivered in 2012 and children at all schools will be invited to participate in the evaluation assessment s. To maximize the sample and to capture new students arriving at intervention and control schools , recruitment will be on-going up to the post-intervention time point . Primary outcomes are time spent sitting and in PA assessed via accelerometers and inclinometers and survey . Discussion To our knowledge , Transform-Us ! is the first RCT to examine the effectiveness of intervention strategies for reducing children 's overall sedentary time , promoting PA and optimizing health outcomes . The integration of consistent strategies and messages to children from teachers and parents in both school and family setting s is a critical component of this study , and if shown to be effective , may have a significant impact on educational policies as well as on pedagogical and parenting practice s . Trial registration ACTRN12609000715279 ; Current Controlled Trials IS RCT BACKGROUND Sedentary time ( ST ) is negatively associated with cardiometabolic health and fitness . Traditional cardiac rehabilitation ( CR ) programming may not significantly reduce ST . The objectives of the study were to assess the feasibility and practicality of activPAL devices for measuring ST in CR , and whether prompting cues to interrupt sedentary behaviour can decrease ST and improve clinical outcomes . METHODS An 8-week , two-arm pilot r and omized controlled trial allocated coronary artery disease patients to either a control ( usual care CR ) or intervention ( CR + sedentary prompts from an activPAL3-VT ) group . Primary outcomes included : recruitment ; acceptability ; completion ; and , adherence rates . Secondary outcomes included changes in : ST ; physical activity ( PA ) ; cardiometabolic health ; psychosocial health ; and , fitness . RESULTS Forty participants ( 16 females ; 19 intervention ; 62 ± 10 years ) were r and omized . Outcome data were available for 95 % of participants . All but one participant completed the full intervention . Most ( 73 % ) intervention participants felt the prompts had somewhat changed their sedentary behaviour . At baseline , participants spent 47 % of their day sedentary . No significant group differences in changes for any of the ST , PA or fitness outcomes were observed . The mean group difference for post-intervention ST ( controlling for baseline ) was 30.3 min/day ( 95 % CI : -51.7 , 112.2 ) in favour of the intervention . The intervention group reported significantly better physical health and had a lower ratio of total cholesterol-to-high density lipoprotein when compared to controls . CONCLUSIONS It is feasible to use activPAL devices to measure ST in a CR setting . Further studies are needed to assess the effectiveness of multi-component sedentary behaviour interventions Background Identifying ways to promote physical activity and decrease sedentary time during childhood is a key public health issue . Research on the putative influences on preschool children ’s  physical activity ( PA ) and  sedentary behavior  ( SB ) is limited and has yielded inconsistent results . Our aim was to identify correlates of PA and SB in preschool children . Methods Cross-sectional data were drawn from the Swiss Preschoolers ’ Health Study ( SPLASHY ) , a Swiss population -based cohort study . Of 476 two to six year old children , 394 ( 54 % boys ) had valid PA data assessed by accelerometry .  Information on exposure data was directly measured or extracted from parental question naires . Multilevel linear regression modeling was used to separately assess associations between 35 potential correlates and  total PA ( TPA ) , moderate-to-vigorous PA ( MVPA ) and SB . Results In total , 12 correlates from different domains were identified . TPA and MVPA were greater in boys than girls , increased with age and were positively associated with gross motor skills . Children from single parent families had a higher level of TPA and spent less time sedentary than those living with two parents . Time spent outdoors was positively associated with TPA and negatively with SB . The child ’s activity temperament was related all three outcomes , whereas parental sports club membership , living area per person and neighborhood safety were associated with SB only . Fixed and r and om factors in the final models accounted for 28 % , 32 % and 22 % of the total variance in TPA , MVPA and SB , respectively . Variance decomposition revealed that age , sex and activity temperament were the most influential correlates of both , TPA and MVPA , whereas the child ’s activity temperament , time outdoors and neighborhood safety were identified as the most important correlates of SB . Conclusions A multidimensional set of correlates of young children ’s  activity behavior has been identified . Personal factors had the greatest influence on PA , whereas environmental-level factors had the greatest influence on SB . Moreover , we identified a number of previously unreported , potentially modifiable correlates of young children ’s PA and SB . These factors could serve to define target groups or become valuable targets for change in future interventions .Trial registration Current Controlled Trials IS RCT N41045021 ( date of registration : 21.03.14 ) BACKGROUND Previous research demonstrates that participation in light-intensity physical activity ( LIPA ) and moderate-to-vigorous physical activity ( MVPA ) are favorably associated with health-related quality of life ( HRQOL ) . Emerging work demonstrates that  sedentary behavior  ( SB ) is detrimentally associated with various cardiometabolic biomarkers , with few studies exploring the association of SB on HRQOL , and no studies examining this among congestive heart failure patients . Therefore , the purpose of this study was to examine the potential independent associations of SB on HRQOL among congestive heart failure patients . METHODS Data from the 2003 - 2006 National Health and Nutrition Examination Survey were used .  Physical activity was assessed over 7days during all waking hours using the ActiGraph 7164 accelerometer .  HRQOL was assessed using the Centers for Disease Control HRQOL index survey . RESULTS 190 participants self-reported a physician-diagnosis of congestive heart failure . After adjustments , SB behavior ( 1-min/day increase ) was associated with worse HRQOL ( β=0.004 ; 95 % CI : 0.0004 - 0.007 ; P=0.03 ) . When MVPA was added as a covariate to this model , SB remained significantly associated with worse HRQOL ( β=0.003 ; 95 % CI : 0.0001 - 0.007 ; P=0.04 ) . However , when adding LIPA to this model that also included MVPA as a covariate , SB was no longer associated with HRQOL ( β=0.0001 ; 95 % CI : -0.003 - 0.004 ; P=0.92 ) . CONCLUSIONS If confirmed by prospect ive/experimental work , this suggests that SB may not have detrimental HRQOL effects among congestive heart failure patients Purpose : The purpose of this study was to test the effect of keeping daily activity records on physical activity levels and self-efficacy for physical activity in adults with type 2 diabetes , and to examine the feasibility and acceptability of this intervention from the perspective of the participants . Methods : This intervention study included 58 individuals with type 2 diabetes aged 40 to 65 years . Participants were r and omly assigned : individuals in the intervention group kept daily activity records for 6 weeks , mailed to the research er every 2 weeks . Data collection was completed at the beginning of the study and 6 weeks later , using the habitual physical activity index and the self-efficacy for exercise scale . Participants in the intervention group also completed the perceived feasibility checklist . Results : The intervention result ed in enhanced self-efficacy . Physical activity improved in both the intervention and control groups . Activity recording was judged to be acceptable and feasible . Conclusions : Daily activity recording can be used as part of a program to increase physical activity self-efficacy levels . Focused interactions between health care providers and patients may be enough to motivate people to higher levels of physical activity . The relationship between self-efficacy and behavior is complex and should be the subject of further research The main objective of this study was to assess whether self-efficacy ( SE ) could function as a moderator of the effect of a tailored Internet-based intervention aim ed at increasing self-reported diabetes self-care behaviours . In a two-group , 1-month interval pre-test-post-test r and omized controlled trial , participants ( N = 64 ) were assigned at r and om to either a group that received an intervention on the area of self-care ( blood glucose monitoring , diet management or physical activity ) for which the reported SE was lowest ( LSE group ) or to a group that received an intervention on area of self-care for which the reported SE was highest ( HSE group ) . Improvements in self-care were observed for both groups , but the HSE group improved more . Self-care also increased for those areas that the intervention did not target . Furthermore , SE levels decreased from baseline to follow-up . This study suggests that SE can function as a moderator in a behavioural intervention for diabetes self-care , and hence that initial level of SE provides relevant information for tailoring such interventions Aims Type 2 diabetes mellitus ( T2DM ) , a serious and prevalent chronic disease , is traditionally associated with older age . However , due to the rising rates of obesity and sedentary lifestyles , it is increasingly being diagnosed in the younger population . Sedentary ( sitting ) behaviour has been shown to be associated with greater risk of cardio-metabolic health outcomes , including T2DM . Little is known about effective interventions to reduce sedentary behaviour in younger adults at risk of T2DM . We aim ed to investigate , through a r and omised controlled trial ( RCT ) design , whether a group-based structured education workshop focused on sitting reduction , with self-monitoring , reduced sitting time . Methods Adults aged 18–40 years who were either overweight ( with an additional risk factor for T2DM ) or obese were recruited for the Sedentary Time ANd Diabetes ( ST AND ) RCT . The intervention programme comprised of a 3-hour group-based structured education workshop , use of a self-monitoring tool , and follow-up motivational phone call . Data were collected at three time points : baseline , 3 and 12 months after baseline . The primary outcome measure was accelerometer-assessed sedentary behaviour after 12 months . Secondary outcomes included other objective ( activPAL ) and self-reported measures of sedentary behaviour and physical activity , and biochemical , anthropometric , and psycho-social variables . Results 187 individuals ( 69 % female ; mean age 33 years ; mean BMI 35 kg/m2 ) were r and omised to intervention and control groups . 12 month data , when analysed using intention-to-treat analysis ( ITT ) and per- protocol analyses , showed no significant difference in the primary outcome variable , nor in the majority of the secondary outcome measures . Conclusions A structured education intervention design ed to reduce sitting in young adults at risk of T2DM was not successful in changing behaviour at 12 months . Lack of change may be due to the brief nature of such an intervention and lack of focus on environmental change . Moreover , some participants reported a focus on physical activity rather than reductions in sitting per se . The habitual nature of sedentary behaviour means that behaviour change is challenging . Trial Registration Controlled-Trials.com IS RCT Background No school-based physical activity ( PA ) interventions among older adolescents have demonstrated long-term effectiveness , and few of them so far have addressed sedentary behaviour ( SB ) . Based on behavioural theories and evidence , we design ed a multi-level intervention to increase  PA  and decrease SB  among vocational school students . This study investigates feasibility and acceptability of two main intervention components and research procedures . We also examine uptake of behaviour change techniques ( BCTs ) by the participants . Methods Design was an outcome assessor blinded , cluster-r and omised controlled trial . Four classes of students ( matched pairs ) were r and omised into one intervention and one control arm . The intervention consisted of ( 1 ) a 6-h group-based intervention for students , ( 2 ) two 2-h training workshops to reduce their students ’ sitting in class for teachers , and ( 3 ) provision of light PA equipment in classrooms . At baseline ( T1 ) , mid-intervention ( T2 ) at 3 weeks , post-intervention ( T3 ) and 6 months after baseline ( T4 ) we measured hypothesised psychosocial mediators and self-reported PA and sitting . Objective assessment of PA and SB ( 7-day accelerometry ) was conducted at T1 , T3 and T4 . Body composition ( bioimpedance ) was measured at T1 and T4 . Students and teachers in the intervention arm filled in acceptability question naires at T3 . Results  Recruitment rate was 64 % ( students ) and 88.9 % ( teachers ) , and at T3 , all post-intervention measurements were completed by 33 students ( retention 76.7 % ) and 15 teachers ( retention 93.8 % ) .  Acceptability ratings of sessions were high ( students M = 6.29 , scale 1–7 ) , and data collection procedures were feasible . Intervention arm students reported increased use of BCTs , but uptake of some key BCTs was suboptimal . BCT use correlated highly with objective measures of PA . Based on both self-report and student evaluation , teachers in the intervention arm increased the use of sitting reduction strategies  at post-intervention and T4 follow-up ( p < .05 ) . Conclusions We detected willingness of the target groups to participate , good response rates to question naires , adequate retention , as well as acceptability of the trial protocol . Investigation of BCT use among students helped further enhance intervention procedures to promote BCT use . After making necessary modifications identified , intervention effectiveness can next be tested in a definitive trial . Trial registration IS RCT N34534846 . Registered 23 May 2014 . Retrospectively registered Purpose The purpose of this study was to examine the characteristics of the  Spanish- language diabetes self-efficacy scale ( DSES-S ) and the English- language version ( DSES ) . Methods This study consists of secondary data from 3 r and omized studies that administered the DSES-S and DSES at 2 time points . The scales consist of 8 Likert-type 10-point items . Principal component analysis was applied to determine if the scales were unitary or consisted of subscales . Univariate statistics were used to describe the scales . Sensitivity to change was measured by comparing r and  omized treatment with control groups  , where the treatment included methods design ed to enhance self-efficacy . General linear models were used to examine the association between the scales and the 8 medical outcomes after controlling for demographic variables . Results Principal component analysis indicated that there were 2 subscales for both versions : self-efficacy for behaviors and self-efficacy to manage blood levels and medical condition . The measures had similar means across the 3 studies , high internal consistent reliability , values distributed across the entire range , and they showed no evidence of floor effects and little evidence of ceiling effects . The measures were sensitive to change . They were associated with several health indicators and behaviors at baseline , and changes were associated with changes in health measures . Conclusions The self-efficacy measures behaved consistently across the 3 studies and were highly reliable . Associations with medical indicators and behaviors suggested validity , although further study would be desirable to compare other measures of self-efficacy for people with type 2 diabetes . These brief scales are appropriate for measuring self-efficacy to manage diabetes BACKGROUND Sedentary behavior ( SB ) has been associated with chronic diseases . University students are a high-risk population for excessive SB . The purpose of this pilot study was to determine if a Health Action Process Approach ( HAPA ) based intervention , specifically action and coping planning , would increase student break frequency and decrease duration . METHODS Fifty-two university students ( 14 men , mean age 23.5 ) were r and omised into an 8-week HAPA-treatment ( sedentary behavior ) or HAPA-control ( nutrition ) group . Participants completed an SB question naire that assessed break frequency and duration of student SB ( Baseline , Weeks 1 - 6 Treatment , and Weeks 7 - 8 Follow-up ) , and received behavioral counselling on either dietary information or SB ( Baseline and Week 3 ) . RESULTS An intent-to-treat analysis revealed a significant group by time interaction effect for student break frequency ( p = .05 , ηρ2 = 0.27 ) , and a non-significant effect for student break duration ( p = .10 , ηρ2 = 0.23 ) . For occupational ( student ) break frequency and duration , the large accompanying effect sizes favored the treatment group . CONCLUSIONS The current pilot study provides preliminary evidence for the potential of a HAPA-based intervention for increasing student break frequency in full-time university students Background The quantity and quality of studies in child and adolescent physical activity and sedentary behaviour have rapidly increased , but research directions are often pursued in a reactive and uncoordinated manner . Aim To arrive at an international consensus on research priorities in the area of child and adolescent physical activity and sedentary behaviour . Methods Two independent panels , each consisting of 12 experts , undertook three rounds of a Delphi methodology . The Delphi methodology required experts to anonymously answer questions put forward by the research ers with feedback provided between each round . Results The primary outcome of the study was a ranked set of 29 research priorities that aim ed to be applicable for the next 10 years . The top three ranked priorities were : developing effective and sustainable interventions to increase children ’s physical activity long-term ; policy and /or environmental change and their influence on children ’s physical activity and sedentary behaviour ; and prospect i ve , longitudinal studies of the independent effects of physical activity and sedentary behaviour on health . Conclusions These research priorities can help to guide decisions on future research directions The primary purpose of the current study was to determine prospect i ve associations of accelerometer‐assessed physical activity intensity and sedentary time with health‐related quality of life ( HRQOL ) indicators among survivors of breast cancer
Assessing SB as a sum of behaviours and using a previous day recall were the most promising features of existing tools .
Accuracy was poor for all existing tools , with underestimation and overestimation of SB .
There was a lack of evidence about sensitivity to change .
OBJECTIVE Sedentary behaviour ( SB ) has distinct deleterious health outcomes , yet there is no consensus on best practice for measurement .
This study aim ed to identify the optimal self-report tool for population surveillance of SB , using a systematic framework .