Key Takeaway
Interrupting prolonged sitting with physical activity breaks significantly improves glucose (SMD -0.54) and insulin (SMD -0.56) compared to continuous sitting.
Summary
This systematic review and meta-analysis examined the cardiometabolic effects of interrupting prolonged sitting across 42 studies, with 37 included in meta-analysis.
Key findings:
- Glucose: SMD -0.54 (95% CI -0.70, -0.37, p < 0.00001) favoring activity breaks
- Insulin: SMD -0.56 (95% CI -0.74, -0.38, p < 0.00001) favoring activity breaks
- Triacylglycerol: SMD -0.26 (95% CI -0.44, -0.09, p = 0.002) favoring activity breaks
Moderating factors:
- Higher BMI associated with greater glucose and insulin benefits
- Both standing and walking breaks showed benefits
- Effects most pronounced in overweight/sedentary populations
Clinical significance:
Interrupting prolonged sitting with brief activity breaks offers a practical workplace intervention for improving metabolic health markers, particularly for those at risk for type 2 diabetes or cardiovascular disease.
Methods
- Systematic review of 42 studies
- Meta-analysis of 37 studies
- Subgroup analyses by activity type
- Meta-regression for moderating factors
- Assessed various interruption protocols
Key Results
- Significant glucose reduction (SMD = -0.54)
- Significant insulin reduction (SMD = -0.56)
- Significant triglyceride reduction (SMD = -0.26)
- BMI moderated glucose response (β = -0.05)
- BMI moderated insulin response (β = -0.05)
Figures
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Limitations
- Heterogeneity in interruption protocols
- Most studies were acute (single day)
- Limited long-term follow-up data
- Variable meal challenges across studies