Why seat tilt adjustment makes sense
A larger, more open seat angle ensures that blood vessels in the abdomen are less constricted - similar to a garden hose that is not kinked! The seat tilt adjustment can therefore be particularly useful in the forward sitting position.
In a neutral sitting position, i.e. without tilting, it is important that the seat height is correctly set. This prevents pressure building up on the underside of the thighs and the full-surface support on the seat provides even support and comfort.
In Sedus swivel chairs, a specially moulded seat recess provides additional support. This is because in dynamic chairs, the leaning pressure when the backrest is tilted generates a counterforce in the seat, which in extreme cases can cause the body to slide forwards unintentionally. The seat moulding designed by Sedus effectively prevents this as ischial tuberosity pain, commonly known as sit bone pain, is effectively slowed down by the rise in front of the seat moulding.
Correct setting of the seat tilt adjustment
When the seat tilt is activated, the seat can tilt forwards by 4°. This change is clearly noticeable. However, if the tilt is adjusted too much (more than 4-5°), the risk of slipping out of the seat increases, especially in the case of:
- Chairs without a pronounced seat recess
- Smooth seat covers such as leather or imitation leather
- Users who only sit on the front edge of the seat and do not use the entire seat surface
These factors can occur frequently in everyday life and should therefore be considered when choosing your seating, or how you sit.
The substructure makes the difference
Many people believe that the comfort of a chair depends primarily on the contours of the seat foam. In fact, measurements of the seat pressure distribution, which Sedus carries out regularly, show that the shape of the hard seat shell, i.e. the substructure, is decisive. Over time, the seat foam "sinks in" up to 2/3 of its original height, especially at the ischial tuberosities, or sit bones, which means that ergonomics depend on the substructure in the long term. A well-moulded seat plate effectively prevents the seat from slipping out of place and ensures lasting ergonomic support.
Effects on skin and tissue
Another effect that occurs when the seat tilt is activated is the increased pushing forces in the skin and the adjacent sub-tissue. Fine veins are sealed in this zone because the tissue is stressed in the longitudinal direction and does not just have to withstand the usual pressure vertically to the skin surface. To avoid this, the seat angle should always be set moderately.
Combination with the work desk
The seat tilt not only influences the sitting posture, but also the ergonomic alignment with the desk. The tilt raises the buttocks by around 25 mm. To continue to achieve an even distribution of pressure on the underside of the thighs, the seat height should be increased by a further 15 mm. This means that the desk height must be adjusted by around 35-40 mm to avoid a stooped posture. A height-adjustable desk ideally complements the seat tilt adjustment.
Conclusion: correct use is crucial
The seat tilt adjustment can be a particularly good solution for people with short legs. With normal pressure on the underside of the thighs, they can sit higher with their buttocks and still reach the floor easily with their feet. This is particularly practical when working at a desk that is not height-adjustable.
The seat tilt adjustment can improve ergonomics and seating comfort if it is used correctly. It is important to consider the general recommendations: A moderate adjustment, the right combination with the desk and consideration of individual body proportions are crucial. If you pay attention to these factors, you can benefit from a seat tilt and make your working day healthier and more comfortable.
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