It is a well established fact that sitting for extended periods of time can be bad for personal health. Global studies show that on average we sit 7.7 hours a day. Whereas some studies have found that a large number of people sit up to 15 hours a day. The problem only gets worse with age. Adults 60 years and older spend between 8.5 to 9.6 hours a day in sedentary time.
The researchers have found that even if we exercise regularly, prolonged sedentary time could negatively impact the health of our heart and blood vessels. Moreover, a sedentary lifestyle may also be associated with an increased risk of diabetes, impaired insulin sensitivity and a higher risk of death from any cause.
The exact mechanisms behind the ill-effects aren't yet clear. Some experts theorize that more sitting leads to reductions in insulin sensitivity, while others believe net calorie expenditures decline as sitting increases.
The specific guidelines recommend that for every 30 consecutive minutes of sitting, stand up and move/walk for three to five minutes to reduce the health risks from sitting.
Health risks of prolonged sitting -
Its health risks have been enumerated below:
Decreases energy expenditure - It can give rise to low energy expenditure, leading to overweight and obesity.
Decreases insulin sensitivity - It can cause a decrease in insulin sensitivity, leading to full-blown type-2 diabetes.
Causes metabolic syndrome - It contributes to metabolic syndrome.
Increases cardio-vascular diseases - It sharply increases risk of cardio-vascular diseases. The researchers have found that men who reported >10 h x wk (-1) riding in a car or >23 h x wk (-1) of combined sedentary behavior had 82% and 64% greater risk of dying from CVD than those who reported <4 or <11 h x wk (-1), respectively.
Promotes cancer - A couple of studies have documented higher rates of cancer and cancer-related deaths in very sedentary people. A sedentary life style has been consistently associated with an increased risk of colon cancer, but the evidence for its association with breast and other gynecologic cancers is limited.
Causes depression - It can cause loneliness and depression as being stuck at the desk or chair means not getting outside enough. Therefore, it reduces the social circle of people. Coupled with this, the lack of sunshine can cause deficiency of vitamin-D, leading to depression. This underlies internet paradox that an advance in social technology leads to health problems.
Bad for back, neck, arms and legs - Prolonged sitting is ergonomically bad for back as it excessively increases back pressure, which may lead to chronic back ache. Besides, it can cause increased stress on the back, neck, arms and legs.
Increases all cause mortality - Prolonged sitting increases all cause mortality independent of regular physical activity. A study found prolonged sitting time was responsible for 6.9% of deaths.
Tips to reduce sedentary time -
· Take a three to five minute break about every half hour during the day to stand, which burns twice as many calories as sitting, or move around.
· Watch TV while standing or exercising.
· Try standing and moving whenever you are talking on a cell phone.
· Standing desks also can help those who are stuck in a cubicle or office all day. Such desks offer the user the option to transition easily from sitting to standing position, being freely able to transition throughout the workday.