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Breaking up prolonged sitting reduces resting blood pressure in overweight/obese adults
Larsen, Robyn Kingwell, Bronwyn A. Sethi, P. Cerin, Ester Owen, Neville Dunstan, David Wayne
Larsen, Robyn
Kingwell, Bronwyn A.
Sethi, P.
Cerin, Ester
Owen, Neville
Dunstan, David Wayne
Abstract
Aim To compare the effect of 7 h of prolonged sitting on resting blood pressure with a similar duration of sitting combined with intermittent brief bouts of light-intensity or moderate-intensity physical activity. Methods and results Overweight/obese adults (n = 19; aged 45–65 years) were recruited for a randomized three-treatment crossover trial with a one-week washout between treatments: 1) uninterrupted sitting; 2) sitting with 2 min bouts of light-intensity walking at 3.2 km/h every 20 min; and, 3) sitting with 2 min bouts of moderate-intensity walking at between 5.8 and 6.4 km/h every 20 min. After an initial 2 h period seated, participants consumed a test meal (75 g carbohydrate, 50 g fat) and completed each condition over the next 5 h. Resting blood pressure was assessed oscillometrically every hour as a single measurement, 5 min prior to each activity bout. GEE models were adjusted for sex, age, BMI, fasting blood pressure and treatment order. After adjustment for potential confounding variables, breaking up prolonged sitting with light and moderate-intensity activity breaks was associated with lower systolic blood pressure [light: 120 ± 1 mmHg (estimated marginal mean ± SEM), P = 0.002; moderate: 121 ± 1 mmHg, P = 0.02], compared to uninterrupted sitting (123 ± 1 mmHg). Diastolic blood pressure was also significantly lower during both of the activity conditions (light: 76 ± 1 mmHg, P = 0.006; moderate: 77 ± 1 mmHg, P = 0.03) compared to uninterrupted sitting (79 ± 1 mmHg). No significant between-condition differences were observed in mean arterial pressure or heart rate. Conclusion Regularly breaking up prolonged sitting may reduce systolic and diastolic blood pressure.
Keywords
sedentary behavior, physical activity, hypertension, obesity
Date
2014
Type
Journal article
Journal
Nutrition Metabolism and Cardiovascular Diseases
Book
Volume
24
Issue
9
Page Range
976-982
Article Number
ACU Department
Mary MacKillop Institute for Health Research
Faculty of Health Sciences
Faculty of Health Sciences
Collections
Relation URI
Source URL
Event URL
Open Access Status
License
File Access
Controlled