Effects of breaking up prolonged sitting with light-intensity walking on postprandial glucose and lipid responses in sedentary adult men.

In 30 seconds

This randomized controlled trial compared two light-intensity walking-break schedules with uninterrupted sitting in 16 sedentary adult men during three 300-minute conditions. Both walking protocols reduced postprandial glucose and insulin exposure relative to sitting: glucose tAUC fell by 7.8% with 4-minute walks every 50 minutes and by 6.4% with 2-minute walks every 30 minutes; insulin tAUC fell by 20.1% and 18.2%, respectively. Triglyceride and most other lipid responses did not differ significantly. The two walking schedules showed no significant differences from each other.

Key findings

• Compared with uninterrupted sitting, glucose tAUC was reduced by 7.8% in 50SW and 6.4% in 30SW (p = .002).
• Insulin tAUC was reduced by 20.1% and 18.2% in 50SW and 30SW, respectively (p < .001).
• Triglyceride and most lipid responses did not differ significantly between conditions.
• Both walking protocols increased fat oxidation and decreased carbohydrate oxidation; no significant differences were observed between protocols.

Why it matters

The findings indicate that brief light-intensity walking interruptions can improve acute post-meal glucose and insulin responses compared with uninterrupted sitting in sedentary men. The similar results across the two schedules suggest that less frequent breaks may achieve comparable short-term metabolic effects, although the study does not establish longer-term health benefits.

What to keep in mind

The study included only 16 sedentary adult men and assessed acute responses during 300-minute conditions, so findings may not generalize to other populations or establish longer-term effects.