You should replace conventional, non-ergonomic office swivel chairs after eight years at the latest. The reason is very simple: With these “normal” office chairs – depending on the price class and shape of the seat – seat depressions form more or less quickly, which fix the pelvis and thus significantly restrict freedom of movement.
A good ergonomic desk chair, on the other hand, has a significantly longer service life. Above all, chairs with a convex seat, some chairs are explicitly designed in such a way that there is no hollow seat at all and seating comfort remains high over the long term. The ergonomic design of the upwardly curved seat surface also has the advantage that your weight is borne precisely by the designated bones of your body – the ischial tuberosities. One can feel the ischial bones when you sit on your hands.
You should also pay attention to quality when it comes to materials and workmanship. High-quality materials and excellent workmanship increase the service life of your ergonomic office chair considerably. And best of all: the resale value remains correspondingly high. However, it is not uncommon for a good office chair to last 20 years. Good for your wallet and your health.
By the way: Whether an ergonomic office chair is of high quality is often shown by the guarantee and customer service. A company that has high-quality standards is at your side with all questions relating to the ergonomic office chair and helps you to get the most out of your back and movement-friendly chair. In addition, there is a guarantee of a few years for high-quality office chairs.
A backrest is not a must for an ergonomic office chair. Sitting on a professional office chair with 3D ergonomics is ergonomically best and healthiest without a backrest. Because active, dynamic sitting in motion without a backrest activates the muscles – especially the back and leg muscles. By sitting without a high backrest and especially without armrests, you can move freely and naturally. This dynamic sitting exercises your muscles and increases your concentration. More movement stimulates the circulation, the brain is better supplied with blood and supplied more oxygen.
The use of the backrest and armrests “incapacitates” the muscles and prevents you from intuitive, spontaneous movements. Sure, most people are used to sitting on conventional office chairs with backrests and armrests. However, sitting (more or less motionless) over the years slackens your back muscles. This is reactivated by an ergonomic office chair without a backrest.