Interrupting Sitting Time with Regular Walks Attenuates Postprandial Triglycerides

Area of Science:

• Exercise Physiology
• Metabolic Health
• Cardiovascular Disease Prevention

Background:

• Prolonged sitting is linked to adverse metabolic outcomes, including elevated postprandial triglycerides.
• Postmenopausal women are particularly susceptible to metabolic changes and cardiovascular risks.

Purpose of the Study:

• To compare the effects of prolonged sitting versus interrupted sitting with walking on postprandial triglyceride levels in postmenopausal women.
• To evaluate the impact of regular short walking bouts versus a single longer bout on metabolic markers.

Main Methods:

• 15 postmenopausal women participated in three randomized trials: prolonged sitting, regular walking breaks, and sitting after continuous walking.
• Participants consumed standardized meals, and blood samples were collected over 8 hours to measure serum triglyceride levels.
• Walking interventions involved either brief, frequent bouts or one morning session.

Main Results:

• Regularly interrupting sitting with walking significantly reduced the incremental area under the curve for serum triglycerides by 15% and 14% compared to prolonged sitting.
• No significant difference was observed between prolonged sitting and sitting after a continuous morning walk.

Conclusions:

• Intermittent physical activity, specifically regular short walking bouts, is effective in mitigating postprandial lipemia in postmenopausal women.
• Strategies to break up sedentary time are crucial for improving metabolic health and potentially reducing cardiovascular risk in this population.