The Acute Effects of Interrupting Prolonged Sitting With Regular Activity Breaks on Postprandial Glucose and Insulin in Adults: A Systematic Review and Meta-Analysis.
Jennifer T Gale, Hannah Martin, Jillian J Haszard et al.
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In 30 seconds
This systematic review and meta-analysis assessed acute laboratory-based randomized crossover trials comparing prolonged sitting with short activity breaks in adults. Of 53 eligible studies, 39 contributed to the meta-analysis. Activity breaks were associated with lower postprandial glucose incremental area under the curve (iAUC; SMD -0.30, 95% CI -0.43 to -0.13) and insulin iAUC (SMD -0.30, 95% CI -0.46 to -0.14) than prolonged sitting. Walking breaks and breaks every 15–20 min showed the largest reductions across the activity modes and frequencies examined.
Key findings
- Activity breaks reduced glucose iAUC versus prolonged sitting (SMD -0.30, 95% CI -0.43 to -0.13).
- Activity breaks reduced insulin iAUC versus prolonged sitting (SMD -0.30, 95% CI -0.46 to -0.14).
- Walking breaks had the largest reported effects among activity modes: glucose iAUC SMD -0.33, 95% CI -0.48 to -0.17; insulin iAUC SMD -0.44, 95% CI -0.62 to -0.27.
- Breaks every 15–20 min produced the largest reported reductions by frequency in glucose and insulin iAUC.
Why it matters
Prolonged sitting can be interrupted with brief activity, and this synthesis indicates that doing so can improve acute post-meal glucose and insulin responses. The findings also suggest that break mode and frequency may matter, with walking and more frequent interruptions showing larger effects. These results inform understanding of short-term metabolic responses, but do not establish longer-term clinical outcomes.
What to keep in mind
The evidence concerns acute (< 24-h), laboratory-based trials and postprandial biomarkers; it does not establish longer-term health outcomes.