The Danish Health Authority Recommends: Limit Inactivity – A Scientific Explanation

By Jakob Hansen, Bachelor of Sports Science, AU

The Danish Health Authority recommends that all adults limit their time spent in inactivity to maintain a healthy lifestyle. This recommendation is based on extensive scientific research that supports the health risks of being inactive for extended periods of time. In this blog post, we will explore why inactivity can be harmful to health, as well as how and why the Danish Health Authority encourages limiting sedentary behavior.

1. Inactivity and Increased Risk of Chronic Diseases

One of the biggest risks of inactivity is the significantly increased risk of developing chronic diseases. Research shows that people who spend large amounts of time in inactivity – for example, by sitting for long periods – have a higher risk of developing several serious health problems, including:

• Cardiovascular disease : Prolonged inactivity has been shown to increase the risk of cardiovascular disease. According to a large systematic review (Biswas et al., 2015), the risk of cardiovascular disease increases significantly if a person sits for more than 8 hours a day without activity, even if the person engages in physical activity later in the day. This is because sedentary behavior negatively affects blood pressure, cholesterol levels, and blood circulation, all of which are risk factors for heart disease.

• Type 2 diabetes : Physical inactivity is a major risk factor for developing type 2 diabetes. When the body is inactive, insulin sensitivity is impaired, which can lead to insulin resistance – a central mechanism in the development of type 2 diabetes (Tremblay et al., 2010). This means that inactive individuals are at increased risk of developing the disease, even though they may not have other obvious risk factors such as obesity.

• Obesity : When you are inactive for long periods of time, your body burns fewer calories, which can lead to weight gain and obesity. Sedentary behavior reduces your body’s ability to regulate energy balance, which can lead to excess calorie intake and long-term weight problems (Thyfault & Booth, 2011). Obesity is associated with a wide range of health problems, including heart disease, type 2 diabetes, and certain cancers.

• Certain types of cancer : Inactivity has also been linked to an increased risk of developing certain types of cancer, particularly colon, breast, and uterine cancer. Research has shown that sedentary behavior can lead to an increase in inflammatory markers and insulin resistance, which are risk factors for cancer development (Moore et al., 2016).

2. Inactivity and Mental Health

Inactivity is not only harmful to physical health; it also has a negative effect on mental health. Prolonged sedentary behavior can lead to an increased risk of mental health problems such as depression, anxiety, and stress.

• Depression and anxiety : Sedentary behavior is associated with a higher risk of symptoms of depression and anxiety. Physical activity is known to stimulate the production of neurotransmitters such as serotonin and dopamine, which are necessary for maintaining a stable mood. Therefore, the lack of physical activity can lead to lower levels of these substances in the brain, which can increase the risk of developing mental disorders (Rebar et al., 2015).

• Stress : Prolonged inactivity can also worsen stress levels. Inactivity itself can cause physical symptoms like muscle tension, headaches, and fatigue, which can contribute to increased stress. Physical activity helps regulate the body's stress response and can reduce levels of the stress hormone cortisol, making it easier to cope with daily challenges.

3. Inactivity and Muscular Health

An important factor that the Danish Health Authority highlights is the negative consequences that inactivity can have on muscles and bones. Being inactive for a long time reduces muscle strength and bone density, which can lead to an increased risk of injuries and reduced functional capacity.

• Muscle atrophy : When muscles are not used regularly, they begin to waste away (atrophy). This can lead to muscle weakness and reduced function. Muscles that are not exercised lose both strength and endurance, which can make it difficult to perform daily tasks and increase the risk of falls, especially in older people.

• Bone health : Just as muscles suffer from inactivity, bones also need regular exercise to maintain their strength and density. Weight-bearing activities such as walking, running, or strength training are essential for preventing osteoporosis. Without regular activity, bones can become fragile and break more easily.

4. The Danish Health Authority's Recommendations and the Effect of Inactivity

The Danish Health Authority stresses the importance of limiting inactivity to maintain good health. Studies have shown that it is not only the amount of activity that is important, but also the amount of time spent in inactivity. It has become clear that inactivity in the form of sitting for long periods without physical activity – also known as sedentary behavior – can have serious health consequences, even when getting the recommended amount of physical activity of 30 minutes a day.

The Danish Health Authority recommends reducing the time spent in sedentary behaviour, such as sitting in front of the computer, watching TV or driving for long periods. Trying to integrate small physical breaks into your daily life can have major health benefits. For example, taking a short walk every hour, getting up and stretching or using a standing desk are simple strategies that can help reduce the negative effects of inactivity.

5. How to Limit Inactivity?

Limiting inactivity doesn't necessarily require big changes to your daily routine, but small actions that can make a big difference in the long run:

• Take breaks from sitting down : If you work at a desk, take a short break every hour where you stand up, stretch, or take a short walk.

• Use active transportation : If possible, walk or cycle instead of driving, and use the stairs instead of the elevator.

• Include physical activity in social activities : Meet friends or family for a walk instead of meeting over coffee, or choose to do sports as a social activity.

• Change position frequently : If you have to sit down for long periods of time, change position often and try to stand up or walk around a bit during the day.

Conclusion

The Danish Health Authority's recommendation to limit inactivity is not without reason. Scientific research has clearly documented the health risks of spending too much time in inactivity, including an increased risk of chronic diseases such as cardiovascular disease, type 2 diabetes and obesity. It is therefore important to find ways to move and limit the time you sit still. Good habits, such as taking small breaks from sedentary activities and finding time for physical activity, can have a positive effect on both your physical and mental health and contribute to a longer and healthier life.

Sources:

• Biswas, A., et al. (2015). Sedentary time and its association with risk for disease incidence, mortality, and hospitalization in adults. Annals of Internal Medicine , 162(2), 123-132.

• Tremblay, MS, et al. (2010). Sedentary behavior and obesity: critical issues in understanding the biology of inactivity. Applied Physiology, Nutrition, and Metabolism , 35(6), 757-762.

• Moore, SC, et al. (2016). Physical activity and the incidence of cancer: a systematic review and meta-analysis. European Journal of Cancer , 61, 207-219.

• Rebar, AL, et al. (2015). The effects of physical activity on depression and anxiety. Mental Health and Physical Activity , 9, 1-12.

• Thyfault, JP, & Booth, FW (2011). Lack of exercise is a major cause of chronic diseases. Comprehensive Physiology .