Category: Public Health

Of possible interest: Please complete this brief survey

| November 25, 2015 | 0 Comments

The below study may be of interest to SBRN members.  Please see details below.

As a practitioner or researcher whose work is in some way connected with physical activity, sedentary time and/or sleep, you are being invited to participate in a survey soliciting your opinion on a draft of Canada’s Integrated 24-Hour Movement Behaviour Guidelines for Children and Youth: an integration of physical activity, sedentary behavior and sleep (herein referred to as the Integrated Guidelines).

Traditionally, research examining the health implications of physical activity, sedentary behaviour, and sleep among children and youth has been conducted in movement behaviour silos, even though these behaviours do not occur in isolation of each other and have intuitive and empirical interactions. A body of research indicates that an integrated or holistic approach is more effective in changing behaviour resulting in a larger impact on health indicators, compared to an approach that only focuses on individual risk factors. Feedback from Canadian pediatricians, our knowledge user colleagues, and our expert international collaborators indicates that evidence-informed 24-hour guidelines that integrate physical activity, sedentary behaviour and sleep are needed and preferred over separate guides in order to enhance the promotion of healthy active lifestyles among children and youth across Canada.

With leadership from the Canadian Society for Exercise Physiology, a group of Canadian and International research and practice experts in physical activity, sedentary behaviour, sleep, and health promotion were convened to participate in the development of the Integrated Guidelines. After reviewing and consolidating the existing bodies of evidence in physical activity, sedentary behaviour and sleep, the experts have produced an initial version of the Integrated Guidelines.

One of the final stages in the development of the Integrated Guidelines is to gain feedback about the clarity of the guidelines, as well as level of agreement, perceived importance, and support for the guidelines from a large number of practitioners (e.g., pediatrics, education, public health, health promotion, physical activity, etc.). Acceptance and dissemination of the Integrated Guidelines is important for the alignment of strategic efforts in policy, practice, and research aimed at promoting health for Canadian children.

Participation in this survey is voluntary. By accessing and completing this survey you are giving your implied/passive consent to participate in the survey. A potential discomfort may include you feeling uncomfortable with some of the questions being asked if they are sensitive or evocative.  If you feel uncomfortable, you may choose not to answer a question. The survey does not collect information about your name or email address and responses will be presented in group format only. This survey will be distributed through our collaborating partner’s networks, memberships and email listservs; in the past, similar surveys have resulted in 2,000 respondents. If you have any questions about this study, please contact Dr. Mark Tremblay at 613-737-7600 ext. 4114 or The Children’s Hospital of Eastern Ontario (CHEO) Research Ethics Board (REB) has reviewed this protocol. The REB considers ethical aspects of all research studies involving human participants at the CHEO and its Research Institute. If you have any questions about your rights as a study participant, you may contact the CHEO REB Chairperson at 613-737-7600 ext. 3624.

Note: Canada’s Integrated 24-Hour Movement Behaviour Guidelines for Children and Youth is in draft form and is not intended for general circulation.

Click on the link below for more information on the survey and instructions on how to get started.  Thanks for your time!

We encourage you to circulate the survey link to your colleagues and among your networks. This stakeholder survey will be open until 12 p.m. EST on December 18th, 2015. 

Exploring the context of sedentary behaviour in older adults (what, where, why, when and with whom)

| November 16, 2015 | 0 Comments

Today’s post comes from PhD student Calum Leask, describing his new paper, which is available here.  You can find more on Calum at the bottom of this post.

Spending too long sedentary is associated with a multitude of physical and mental health risks.  Of all sub-groups, older adults are the most sedentary and spend an average of 8.5 hours a day sitting down.  Everybody is living longer now than ever before and therefore, it is important to make sure that these additional years can be as healthy as possible.  One simple way this can be done is by reducing the amount of time spent sitting and interrupt prolonged (>60 mins) seated periods.  Depending on the context of older adults’ sitting (for example what, when, where and with whom are these periods occurring), some sedentary bouts may be easier / more difficult to break up.  Therefore, gaining this information may provide valuable guidance for future research.  This is one of the first studies to explore the context of sedentary behaviour in older adults using objective measures (an activity monitor and wearable camera) and this study formed the first stage of my PhD research.  The study was co-authored by Juliet Harvey, Professor Dawn Skelton and Dr Sebastien Chastin at the Institute of Applied Health Research in Glasgow Caledonian University.

For this study, 36 older adults (13 male and 23 female) were recruited and wore an activity monitor and timelapse camera for between 1 and 7 days.  Participants had a mean age of 73 years and were recruited from the Glasgow Caledonian University Older Adult Volunteer Research Database.  The activity monitor was attached to the individuals’ leg and detected both movement and posture in order to identify the periods in which participants were sedentary.  The timelapse camera was worn on a lanyard around the participants’ neck and automatically captured an image of the physical environment from a first person perspective when a change in light or temperature was detected.  The images taken during the sedentary periods identified by the activity monitor were then examined using an international classification system (SITONAUMY) to describe what, where, when, why and with whom the sedentary periods were occurring.  The concept of using the activity monitor and camera images in combination is visible below.

figure 1

In total, 52 days of data from 36 participants were available for analysis.   Participants spent the majority of their sedentary time (70.1% at home) and 22.9% of their non-screen sedentary behaviour reading.  Whilst the deleterious effects of sitting too much have already been discussed, activities like reading are cognitively stimulating and facilitate cognitive function, especially during aging.  Therefore, it should be questioned whether future interventions should target these periods, or solely focus on sedentary activities which are cognitively passive.

figure 2

A large portion of older adults’ sedentary time (56.9%) was spent alone.  Loneliness increases the risk of prolonging sedentary time in this population; therefore older adults living alone may be an important sub-group to specifically target in future interventions.  The social sedentary activities which this sample participated in were prolonged (18% of sedentary time) yet infrequent (6.9% of sedentary bouts).  Socialising, like reading, has a mental health benefit, therefore it may be suggested that sedentary activities in specific contexts should be targeted, as opposed to generically aiming to reduce sedentary behaviour.

figure 3

Whilst this study was conducted on a relatively small convenience sample, some of the results, including average daily sedentary time (14.2 hours) and television viewing time (4.3 hours), compare favourably to larger previously published works.  Although using objective measurement (as conducted here) has been shown as more accurate than subjective means, the assessment is quite costly and due to the vast amount of data collected, requires intensive data processing and coding.  However, the findings provide detailed insight into the context of older adults’ sedentary behaviour and provide specific guidelines for future interventions, although these results should be confirmed in a larger and representative population of older adults.

The full text may be found here:



       Calum Leask

Calum Leask is a PhD Student in the School of Health and Life Sciences at Glasgow Caledonian University, Scotland.  His research focuses on reducing sedentary behaviour in older adults and more specifically, developing strategies to help older adults identify and reduce prolonged seated periods. For further information, please contact:

Measurement in Physical Education and Exercise Science Special Issue on Sedentary Behaviour

| October 15, 2015 | 0 Comments

The journal Measurement in Physical Education and Exercise Science is pleased to announce the publication of the new Special Issue on the measurement of sedentary behaviour (title: “Don’t Just Sit There – Do Something!“). The Special Issue is open for free access until the end of 2015.

test special issue


A press release describing the new issue can be found here.


The physiology of sedentary behavior in children with cerebral palsy and people with stroke.

| October 7, 2015 | 0 Comments

Today’s post comes from Dr. Olaf Verschuren, of the Centre of Excellence for Rehabilitation Medicine in Utrecht.

Children with cerebral palsy and adults with stroke are advised to participate in moderate to vigorous physical activity (MVPA), such as brisk walking and running. However, these patient groups develop or return to an inactive lifestyle due to the different physical, cognitive and environmental barriers, and often become deconditioned and predisposed to a sedentary lifestyle that may contribute to an increased risk for their health.

As we all know, prolonged periods of sedentary behavior are  associated with several metabolic risk factors and all-cause mortality, independent of participation in physical activity. Therefore, people with stroke and children with cerebral palsy should not only participate in physical activity but also try to reduce or break up sedentary time as this might reduce the high risk of health problems. However, there is a lack of knowledge about sedentary behavior in these patient groups.

The SBRN defined ‘‘sedentary’’ as any waking behaviour characterized by an energy expenditure ≤1.5 metabolic equivalent of task (MET) while in a sitting or reclining posture. Despite sitting being an omnipresent behavior in all people, there are no studies actually assessing the energy expenditure of sitting and standing in people with stroke and children with cerebral palsy. So, in order to be able to support people with stroke and children with cerebral palsy to engage in activities that generate light to moderate intensity energy expenditure (that exceeds the 1.5 METs) and confer some health benefit, it is necessary to know which activities generate the required physiological response. Thus, when operationalizing sedentary behavior against low intensity physical activities such as sitting, standing and walking, we have to rely on the energy expenditure.

Olaf Verschuren (researcher at the Brain Center Rudolf Magnus and Center of Excellence for Rehabilitation Medicine, University Medical Center Utrecht and De Hoogstraat Rehabilitation, in Utrecht, The Netherlands) and colleagues recently published two studies that objectively measured and calculated the energy expended by people with stroke and children with cerebral palsy during near sedentary behaviors.

The main findings:

  • Children and adolescents with cerebral palsy across all functional had energy expenditures higher than 1.5 METs during standing. Our findings related to energy expenditure therefore suggest that changing children’s position to a standing position may contribute to the accumulation of light activity and reduce sedentary behavior. See Figure 1.Figure 1
  • The findings of the study in people with stroke demonstrate that the energy expenditure during typical sedentary behaviors (sitting supported and unsupported is very narrowly bounded around 1.0 METs. Energy expenditure during sitting and standing was ≤1.5 METs for almost all functional levels. Independent wheelchair propulsion and walking seem to be light activities (≥1.5 METs) that could be used by people with stroke to interrupt sedentary behavior. See Figure 2.

Figure 2


Verschuren, Olaf, et al. “Muscle activation and energy-requirements for varying postures in children and adolescents with cerebral palsy.” The Journal of pediatrics 165.5 (2014): 1011-1016.

Verschuren, Olaf, et al. “Characterizing energy expenditure during sedentary behavior after stroke.” Archives of Physical Medicine and Rehabilitation (2015).





Targeting Physical Activity Doesn’t Reduce Sedentary Time

| October 2, 2015 | 0 Comments

Via  Stone Hearth Newsletters:

For the first time, this new study has shown that increasing levels of physical activity is likely to be much less effective at reducing prolonged sitting than directly attempting to decrease sitting time.

The research team, led by Dr Benjamin Gardner, from the Department of Psychology at the IoPPN, King’s College London, searched the current existing literature on trials of interventions that sought to reduce sitting time. The team then categorised these studies according to their effectiveness, and examined the strategies that had been used in each trial to try to reduce sitting. The studies were deemed promising, where those who received the intervention did reduce sitting time, or not promising, where the interventions did not reduce sitting time.

Out of the 38 interventions assessed, a majority of 23 (60 per cent) were found promising whilst 15 (39 per cent) were found not promising.

Some of the promising interventions included the provision of sit-stand desks at work, though other techniques such as encouraging people to keep records of their own sitting time, setting individual goals for limiting sitting time, and using prompts and cues to remind people to stop them sitting, were also found to help reduce sitting time, even when used in isolation.

In addition, effective interventions tended to educate people about the health benefits of reducing their sitting time.

The full article is available via the Stone Hearth Newsletters.

Revising on the run vs studying on the sofa

| September 16, 2015 | 0 Comments

A new paper in IJBNPA examines the prospective associations between physical activity, sedentary behaviour, and academic achievement in British teens:


We investigated prospective associations between physical activity/sedentary behaviour (PA/SED) and General Certificate of Secondary Education (GCSE) results in British adolescents.


Exposures were objective PA/SED and self-reported sedentary behaviours (screen (TV, Internet, Computer Games)/non-screen (homework, reading)) measured in 845 adolescents (14·5y ± 0·5y; 43·6 % male). GCSE results at 16y were obtained from national records. Associations between exposures and academic performance (total exam points) were assessed using multilevel mixed-effects linear regression adjusted for mood, BMI z-score, deprivation, sex, season and school; potential interactions were investigated.


PA was not associated with academic performance. One-hour more accelerometer-assessed SED was associated with (β(95 % CI)) 6·9(1·5,12·4) more GCSE points. An extra hour of screen time was associated with 9.3(−14·3,-4·3) fewer points whereas an extra hour of non-screen time (reading/homework) was associated with 23·1(14·6,31·6) more points. Screen time was still associated with poorer scores after adjusting for objective PA/SED and reading/homework.


An extra hour/day of screen time at 14·5y is approximately equivalent to two fewer GCSE grades (e.g., from B to D) at 16y. Strategies to achieve the right balance between screen and non-screen time may be important for improving academic performance. Concerns that encouraging more physical activity may result in decreased academic performance seem unfounded.

The full text can be access for free via the IJBNPA website.

Everything Science Knows Right Now About Standing Desks

| September 16, 2015 | 0 Comments

Fast Company Design has an article on a recent systematic review summarizing the available evidence on active workstations:

If it wasn’t already clear through common sense, it’s become painfully clear through science that sitting all day is terrible for your health. What’s especially alarming about this evidence is that extra physical activity doesn’t seem to offset the costs of what researchers call“prolonged sedentary time.” Just as jogging and tomato juice don’t make up for a night of smoking and drinking, a little evening exercisedoesn’t erase the physical damage done by a full work day at your desk.

In response some people have turned to active desks—be it a standing workspace or even a treadmill desk—but the research on this recent trend has been too scattered to draw clear conclusions on its benefits (and potential drawbacks). At least until now. A trio of Canada-based researchers has analyzed the strongest 23 active desk studies to draw some conclusions on how standing and treadmill desks impact both physiological health and psychological performance.

The full article is available via the Fast Company Design website.


New Study: The Interdependent Relationship Between Sedentary Behaviour and Physical Activity

| September 11, 2015 | 0 Comments

A new study in the International Journal of Environmental Research and Public Health examines the influence of urban design, neighbourhood built and social environment, and household and individual factors on the interdependent relationship between objectively measured physical activity and sedentary behaviour in children. The abstract:

Even though physical activity and sedentary behaviour are two distinct behaviours, their interdependent relationship needs to be studied in the same environment. This study examines the influence of urban design, neighbourhood built and social environment, and household and individual factors on the interdependent relationship between objectively measured physical activity and sedentary behaviour in children in the Canadian city of Saskatoon. Saskatoon’s built environment was assessed by two validated observation tools. Neighbourhood socioeconomic variables were derived from 2006 Statistics Canada Census and 2010 G5 Census projections. A questionnaire was administered to 10–14 year old children to collect individual and household data, followed by accelerometry to collect physical activity and sedentary behaviour data. Multilevel logistic regression models were developed to understand the interrelationship between physical activity and sedentary behaviour in the context of diverse environmental exposures. A complex set of factors including denser built environment, positive peer relationships and consistent parental support influenced the interrelationship between physical activity and sedentary behaviour. In developing interventions to facilitate active living, it is not only imperative to delineate pathways through which diverse environmental exposures influence physical activity and sedentary behaviour, but also to account for the interrelationship between physical activity and sedentary behaviour.

The full paper is available for free via the International Journal of Environmental Research and Public Health website.

New study: Benefits of reallocating sitting to standing or stepping

| August 3, 2015 | 0 Comments

A new study in the European Heart Journal has investigated the impact of (statistically) replacing sitting with standing or walking.  The abstract:

Aims While excessive sitting time is related adversely to cardio-metabolic health, it is unknown whether standing is a suitable replacement activity or whether ambulatory movement is required. Using isotemporal substitution analyses, we modelled cross-sectional associations with cardio-metabolic risk biomarkers of reallocating time (2 h/day) from sitting to standing or to stepping.

Methods and results A subsample of participants from the 2011/12 Australian Diabetes, Obesity, and Lifestyle Study wore the posture-based activPAL3 monitor [36–80 years (mean 57.9, SD 9.9 years); 57% women; n = 698 with data]. Associations of activPAL3-derived mean daily time sitting/lying (sitting), standing and stepping with body mass index (BMI), waist circumference, blood pressure, HbA1c, fasting glucose and lipids (high-density lipoprotein-, HDL, and low-density lipoprotein-cholesterol, total/HDL-cholesterol ratio, and triglycerides), and 2-h plasma glucose were examined. Adjusted for relevant confounders, sitting-to-standing reallocations were only significantly (P < 0.05) associated with approximately 2% lower fasting plasma glucose, 11% lower triglycerides, 6% lower total/HDL-cholesterol ratio, and 0.06 mmol/L higher HDL-cholesterol per 2 h/day. Sitting-to-stepping reallocations were only significantly associated with approximately 11% lower BMI, 7.5 cm lower waist circumference, 11% lower 2-h plasma glucose, 14% lower triglycerides, and 0.10 mmol/L higher HDL-cholesterol per 2 h/ day, while standing-to-stepping reallocations were only significantly associated with ∼10% lower BMI, 7 cm lower waist circumference, and 11% lower 2-h plasma glucose.

Conclusion Findings suggested that sitting-reduction strategies targeting increased standing, stepping, or both, may benefit cardio-metabolic health. Standing is a simple alternative to sitting, and requires further examination in prospective and intervention studies.

The full paper is available for free via the European Heart Journal website.


Sedentary behaviour and axiety: new systematic review

| June 22, 2015 | 18 Comments

A systematic review exploring the link between sedentary behaviour and anxiety was published recently in the journal BMC Public Health.


Previous research has linked sedentary behaviour (SB) to adverse physical health outcomes in adults and youth. Although evidence for the relationship between SB and mental health outcomes (e.g., depression) is emerging, little is known regarding risk of anxiety.


A systematic search for original research investigating the association between SB and risk of anxiety was performed using numerous electronic databases. A total of nine observational studies (seven cross-sectional and two longitudinal) were identified. Methodological quality of studies was assessed and a best-evidence synthesis was conducted.


One cross-sectional study demonstrated a strong methodological quality, five cross-sectional studies demonstrated a moderate methodological quality and three studies (two cross-sectional one longitudinal) received a weak methodological quality rating. Overall, there was moderate evidence for a positive relationship between total SB and anxiety risk as well as for a positive relationship between sitting time and anxiety risk. There was inconsistent evidence for the relationship between screen time, television viewing time, computer use, and anxiety risk.


Limited evidence is available on the association between SB and risk of anxiety. However, our findings suggest a positive association (i.e. anxiety risk increases as SB time increases) may exist (particularly between sitting time and risk of anxiety). Further high-quality longitudinal/interventional research is needed to confirm findings and determine the direction of these relationships.

The full review is available for free via the BMC Public Health website.