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Acute Effects of Interrupting Prolonged Sitting With Intermittent Physical Activity on Blood Pressure in
Emma Weston1, Matthew Nagy1, Tiwaloluwa A Ajibewa1
1University of Michigan.
Insights
Intermittent physical activity (PA) breaks did not significantly alter blood pressure in children. However, systolic blood pressure naturally decreased throughout the day across all conditions.
Area of Science:
- Pediatric Health
- Cardiovascular Physiology
- Exercise Science
Background:
- Sedentary behavior is linked to hypertension in children.
- Understanding the impact of physical activity on children's blood pressure is crucial for public health.
- Research is needed to determine optimal physical activity "doses" for cardiovascular benefits.
Purpose of the Study:
- To compare the acute effects of intermittent physical activity (PA) at four different intensities on children's blood pressure.
- To investigate if varying intensities of PA breaks influence blood pressure readings throughout the day.
- To assess the impact of sedentary screen-time breaks versus PA breaks on blood pressure.
Main Methods:
- Thirty children (aged 7-11 years) participated in a randomized crossover study.
- Children completed four 8-hour conditions: sedentary screen time or 2-minute PA breaks at low, moderate, or high intensity (25%, 50%, 75% heart rate reserve).
- Blood pressure (systolic and diastolic) was measured at 0800, 1200, and 1600 hours during each condition.
Main Results:
- No significant differences in systolic blood pressure (SBP) were found across the different PA intensity conditions.
- SBP significantly decreased throughout the day in all conditions, regardless of break type or intensity.
- Diastolic blood pressure showed no significant changes related to the experimental conditions or time of day.
Conclusions:
- A single bout of prolonged sitting, even with intermittent PA breaks, may not be sufficient to acutely affect blood pressure in healthy children.
- The intensity and duration of PA breaks in this study did not yield significant hypotensive effects.
- Further research is recommended to identify the specific "dose" of intermittent PA required to achieve blood pressure-lowering effects in preadolescent children.
Purpose:
To compare the acute effects of intermittent physical activity (PA) across 4 different intensities on blood pressure.
Methods:
Thirty children (12 males and 18 females; aged 7-11 y; 33% overweight/obese; 53% nonwhite) completed 4 experimental conditions in random order: 8 hours sitting interrupted with 20, 2-minute low-, moderate-, high-intensity PA breaks, or sedentary screen-time breaks. PA intensity corresponded with 25%, 50%, and 75% of heart rate reserve. Blood pressure was measured during each condition in the morning (0800 h), noon (1200 h), and afternoon (1600 h).
Results:
There were no significant differences across conditions for systolic blood pressure (SBP; all Ps > .05). There was a significant effect of time with SBP decreasing throughout the day for all conditions (average morning SBP: 106 [1] mm Hg, average noon SBP: 101 [2] mm Hg, average afternoon SBP: 103 [1] mm Hg; P = .01). There were no significant effects of condition or time on diastolic blood pressure (all Ps > .05).
Conclusion:
While sedentary behavior is known to be associated with hypertension in both adults and children, a single bout of prolonged sitting may be insufficient to produce hypertensive effects in otherwise healthy children. Future research should examine the appropriate dose of intermittent PA to accrue hypotensive responses in preadolescent children.
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