Meta-analysisindependent cross-checkabstract only checked I-SYS-04 standard review
More daily movement, even light, is linked to much lower mortality
Dose-response associations between accelerometry measured physical activity and sedentary time and all cause mortality: systematic review and harmonised meta-analysis.
Overview
Ekelund U et al.. BMJ 2019 · PMID 31434697 · DOI 10.1136/bmj.l4570
The most active quarter had about a quarter of the death risk of the least active.
Does the study support the specific claim? Yes · Methodological quality: moderate
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Activity-mortality dose-response.
- How was the study done?
Harmonised meta-analysis.
- How many people, animals or samples were studied?
36,383.
- What was actually found?
Lower mortality with activity.
- How large was the observed effect?
HR 0.27 top quarter.
- What do the results mean in everyday life?
Move more, sit less.
- What are the study's limitations?
Observational.
- What does it say about Elawady's specific claim?
Supports movement.
- Do the results apply to Germany and Europe?
High.
- What can explicitly not be concluded from this study?
Exact causal size.
Scientific in-depth review
1. Full reference
- Authors
- Ekelund U et al.
- Journal
- BMJ
- Year
- 2019
- Identifier
- PMID 31434697 DOI 10.1136/bmj.l4570
- Verification
- verified – PubMed esummary + efetch 2026-10-25
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
No relevant competing interests declared
2. Research question
Physical activity/sedentary time and mortality.
3. Study design and population
- Study design
- Meta-analysis – Systematic review and harmonised IPD meta-analysis of cohorts
- Population
Middle-aged and older adults
- Country
International
- Period
Median follow-up 5.8 years
- Sample size
8 studies; 36,383; 2,149 deaths
- Inclusion and exclusion criteria
Accelerometer-measured activity
4. Methods and endpoints
- Exposure / intervention
Physical activity quarters
- Comparator
Least active quarter
- Endpoints
All-cause mortality
- Statistical methods
Cox; random effects
5. Actual results
- Results
Total activity HR 0.48, 0.34, 0.27 for quarters 2-4 vs least active; light activity HR down to 0.38; sedentary time HR up to 2.63.
- Absolute risks
not reported
- Authors' conclusion
Any intensity of activity and less sedentary time are associated with substantially lower mortality.
6. Strengths
- Objective measurement
- Harmonised data
7. Weaknesses
- Observational; reverse causation
8. Risk of bias
- Orienting tool
- AMSTAR 2
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- some concerns
- Rationale
Observational.
9. Assessment of the statistical interpretation
Strong associations; some reverse causation likely.
10. Relevance to the specific claim
Supports daily movement as health behaviour.
11. Independent contrary findings
12. Transferability to Germany and Europe
High.
13. Overall methodological judgement
Supports the archive's 'daily movement'.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | moderate |
| Risk of bias | some concerns |
| Precision of results | high |
| Directness | direct |
| Reproducibility | replicated |
| Consistency with the overall evidence | consistent |
| Regional transferability | high |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
15. Linked fact checks
- Daily movement, deep breathing and adequate sleep complement the system. – Studies supporting the claim
- Lack of movement is the origin (main cause) of weight accumulation. – Studies with mixed or unclear results