According to a new study, spending more time standing instead of sitting could improve your blood sugar, fats in the blood and cholesterol levels. Replacing time spent sitting with time walking could have additional benefits for your waistline and body mass index (BMI), the study also shows.
The study involved 782 men and women, aged 36-80 years, who were taking part in the Australian Diabetes, Obesity and Lifestyle Study and given acitivty monitors. The monitors accurately tracked how long each participant spent sleeping, sitting or lying down, standing and stepping (which includes walking and running).
After giving blood samples and measurements of their blood pressure, height, weight and waist circumference, participants each wore an activity monitor on their thigh for 24 hours a day over a seven-day period. The researchers then used a statistical technique called isotemporal analysis to estimate the potential impact on health of reallocating time from sitting to standing or stepping.
Study leader Dr Genevieve Healy, senior research fellow at the University of Queensland, Australia, said:
“We found that time spent standing rather than sitting was significantly associated with lower levels of blood sugar and blood fats. Replacing sitting time with stepping was also associated with a significant reduction in waistline and BMI. While the study cannot show that less time spent sitting causes the improvements in these markers of health, the associations it reveals are consistent with what is known already about the benefits of a non-sedentary lifestyle. More work is needed to understand cause and effect.”
Replacing two hours a day of sitting time with stepping was associated with an approximately 11% lower average BMI and a 7.5cm smaller average waist circumference.
Not only that, but average blood sugar levels fell by approximately 11% and average triglycerides by 14% for every two hours spent walking rather than sitting, while HDL cholesterol was 0.10 mmol/L higher.
There was no significant effect on BMI or waistline of replacing sitting time with standing.
“These findings provide important preliminary evidence that strategies to increase the amount of time spent standing or walking rather than sitting may benefit the heart and metabolism of many people,” said Dr Healy. “Get up for your heart health and move for your waistline.
This has important public health implications, given that standing is a common behaviour that usually replaces sitting, and that can be encouraged in the workplace with interventions such as sit-stand desks.
However, it is important to say that not all sitting is bad; but if people can incorporate alternatives to sitting wherever possible, it may benefit their heart and metabolic health. Our message is to ‘Stand Up, Sit Less, Move More’.”
Writing in an editorial, Professor Francisco Lopez-Jimenez (MD, MSc) of the Mayo Clinic and Mayo College of Medicine said that the study provides an important addition to the wealth of scientific evidence highlighting the importance of avoiding sedentary behaviour.
He adds that the fight against sedentary behaviour cannot be won based only on the promotion of regular exercise, and that while exercise should continue to be recommended, it is important to promote non-sedentary behaviour in everyday life.
“A person walking while at work for two hours, standing for another four hours, and performing some daily chores at home for another hour will burn more calories than jogging or running for 60 minutes.”
He also noted that sedentary behaviour and environments that promote it are seen as a sign of progress and economic power.
For example, poorer people are more likely to bike or walk than drive a car, and standing tickets to watch a football match or an opera will be cheaper than seated tickets. He concludes:
“The unintended consequences of modern life promoting sedentary behaviours can be reversed. Health care providers, policy makers and people in general need to stand up for this. Literally.”
Genevieve N. Healy, Elisabeth A. H. Winkler, Neville Owen, Satyamurthy Anuradha, David W. Dunstan
Replacing sitting time with standing or stepping: associations with cardio-metabolic risk biomarkers
European Heart Journal DOI: http://dx.doi.org/10.1093/eurheartj/ehv308
Photo: Juhan Sonin/flickr