PainSci summary of Pulsford 2015?This page is one of thousands in the PainScience.com bibliography. It is not a general article: it is focused on a single scientific paper, and it may provide only just enough context for the summary to make sense. Links to other papers and more general information are provided at the bottom of the page, as often as possible. ★★★★☆4-star ratings are for bigger/better studies and reviews published in more prestigious journals, with only quibbles. Ratings are a highly subjective opinion, and subject to revision at any time. If you think this paper has been incorrectly rated, please let me know.
This study is a nice FUD-fighter: its results directly contradict the overhyped notion that a lot of sitting is just as dangerous as smoking, an idea that’s been around for a few years now and it reeks of premature, fear-mongering speculation. There was never any good evidence that “sitting is the new smoking,” but this is good evidence that “sitting time was not associated with all-cause mortality risk” in over 5,000 subjects.
This doesn’t remotely get us off the exercise hook. It doesn’t mean that a sedentary lifestyle is safe or healthy, but it does strongly suggest that we aren’t doomed by it (that is, you likely can compensate for a lot of time in a chair by being as active as possible otherwise).
The study’s biggest weakness — and it is a bit of a doozy — is that it’s based on self-reported activity levels, which are notoriously inaccurate.
original abstract†Abstracts here may not perfectly match originals, for a variety of technical and practical reasons. Some abstacts are truncated for my purposes here, if they are particularly long-winded and unhelpful. I occasionally add clarifying notes. And I make some minor corrections.
BACKGROUND: Sitting behaviours have been linked with increased risk of all-cause mortality independent of moderate to vigorous physical activity (MVPA). Previous studies have tended to examine single indicators of sitting or all sitting behaviours combined. This study aims to enhance the evidence base by examining the type-specific prospective associations of four different sitting behaviours as well as total sitting with the risk of all-cause mortality.
METHODS: Participants (3720 men and 1412 women) from the Whitehall II cohort study who were free from cardiovascular disease provided information on weekly sitting time (at work, during leisure time, while watching TV, during leisure time excluding TV, and at work and during leisure time combined) and covariates in 1997-99. Cox proportional hazards models were used to investigate prospective associations between sitting time (h/week) and mortality risk. Follow-up was from date of measurement until (the earliest of) death, date of censor or July 31 2014.
RESULTS: Over 81 373 person-years of follow-up (mean follow-up time 15.7 ± 2.2 years) a total of 450 deaths were recorded. No associations were observed between any of the five sitting indicators and mortality risk, either in unadjusted models or models adjusted for covariates including MVPA.
CONCLUSIONS: Sitting time was not associated with all-cause mortality risk. The results of this study suggest that policy makers and clinicians should be cautious about placing emphasis on sitting behaviour as a risk factor for mortality that is distinct from the effect of physical activity.
- “Patterns of sedentary behavior and mortality in US middle-aged and older adults: a national cohort study,” Keith M Diaz, Virginia J Howard, Brent Hutto, Natalie Colabianchi, John E Vena, Monika M Safford, Steven N Blair, and Steven P Hooker, Annals of Internal Medicine, 2017.
One article on PainScience.com cites Pulsford 2015 as a source:
- PS The Trouble with Chairs — The science of being sedentary and how much it does (or doesn’t) affect your health and back pain
This page is part of the PainScience BIBLIOGRAPHY, which contains plain language summaries of thousands of scientific papers & others sources. It’s like a highly specialized blog. A few highlights:
- Effectiveness of customised foot orthoses for Achilles tendinopathy: a randomised controlled trial. Munteanu 2015 Br J Sports Med.
- A Bayesian model-averaged meta-analysis of the power pose effect with informed and default priors: the case of felt power. Gronau 2017 Comprehensive Results in Social Psychology.
- The neck and headaches. Bogduk 2014 Neurol Clin.
- Agreement of self-reported items and clinically assessed nerve root involvement (or sciatica) in a primary care setting. Konstantinou 2012 Eur Spine J.
- Effect of NSAIDs on Recovery From Acute Skeletal Muscle Injury: A Systematic Review and Meta-analysis. Morelli 2017 Am J Sports Med.