Two weeks on the couch costs you as much fitness as aging seven years.

Two weeks on the couch costs you as much fitness as aging seven years.

That is not a typo.

After two weeks of significantly reduced movement – for example, from over 10,500 to about 1,300 steps per day – your fitness (VO₂max) decreases by an average of 6.6%. This is based on small-scale studies, but the message is clear: sitting too much harms your fitness. Research shows this time and again.

For comparison: due to normal aging, your VO₂max decreases on average by about 1% per year. Sitting still for two weeks can make your fitness decline as if you have aged nearly seven years.

The good news? That effect is reversible. By exercising regularly and sufficiently again, you can quickly improve your fitness. In fact, even at the age of 70, you can have a VO₂max that is comparable to someone who is several decades younger, as long as you stay active.

Loss of conditioning is not the only consequence of sitting too much.

After sitting continuously for 30 minutes, the blood circulation in your legs noticeably decreases. This is because your leg muscles are less active and thus require less blood. At the same time, the function of your blood vessels worsens and your blood pressure slowly creeps up.

A striking example: in research, signs of vascular damage in the blood increased by nearly 500% after people reduced their daily activity from about 12,000 to 3,500 steps for five days.

Through these and other mechanisms, prolonged sitting increases the risk of cardiovascular diseases.

Fortunately, there is something you can do about it. Move your legs regularly while sitting to keep the blood circulation going. Even better is to stand up every 30 minutes and walk for two to three minutes. Can't do that? Fidget, wiggle, and move your legs as much as possible during long periods of sitting.

Do you have high blood pressure? Then the health benefits of these small moments of movement are probably even greater.

Follow me for the upcoming parts about the impact of sitting on your health. Part 3 focuses on the effects on your muscles and bones.

Source: Pinto AJ et al. (2023). Physiology of Sedentary Behavior. Physiol Rev.

Source: Sander Kers