Sitting for more than four hours a day significantly increases the risk of chronic diseases such as hypertension, heart disease, diabetes and cancer, according to a survey of 63,048 middle-aged men in Australia. Day fitness can not restore sedentary harm to the body. In addition, people who sit for more than 6 hours a day are more likely to get diabetes. By reducing excessive sitting to less than three hours a day, an American's life expectancy can be increased by two years, and television viewing can be reduced to less than two hours a day by another 1.4 years. Smoking reduces men's life expectancy by 2.5 years, compared with smoking, and women's life expectancy by 1.8 years. In a study of 6,379 people aged 40 to 75, those who sat less had a reduced risk of kidney disease, a more significant effect for women. If they sat from full day to just three hours a day, the risk of kidney disease was reduced by 30% and for men by 15%. What's more depressing is that sitting too long may be bad for mental health, too. British research has found that sitting too long outside of work can have a negative impact on mental health. Watching TV, playing computer games, driving and so on - have a negative impact on women's mental health, while for men, it's only in front of the computer. It's easy to be obese if you sit too long. Fat people sit an average of 2.5 hours longer than thin people. Understandably, sitting too long can lead to metabolic syndrome --- belly fat, reduced "good cholesterol," high blood pressure, high blood sugar, and high blood lipids, which point to the first one: high blood pressure, heart disease, diabetes. In colorectal cancer, people who are diagnosed with colorectal cancer die faster. A 2012 study of 200,000 Australians over the age of 45 found that sedentary people, regardless of gender, age, BMI, had an increased risk of death, and those who sat for more than 11 hours a day had a 40% increase in mortality over three years. Exercise for more than five hours a week reduces the risk of death, but it does not completely eliminate the risk of death from sedentary activity.
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