Scientific
Many professions require to be seated 90% of the time.

Back complaints.

Research has proven that most chairs used in the working environment do not provide sufficient back support. Eight out of ten people develop back complaints because of seated work. Three out of ten people suffer daily back pains.

Sitting under pressure.

In many professions people need to sit 90% of the time. When seated, the pressure in the lower back discs is twice as high as when standing. Disc damage can present itself as a vague pain, or at times can cause severe pain.

 

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Cause.

What is considered to be the cause of disc damage?

During sitting the spine (especially the lumbar spine) tends to bend into a convex shape. This causes pain when trying to change posture. The center of the internal pressure within the disc is moved backwards which causes the posterior tissue of the disc to stretch. Due to this stretching the risk of nerve irritation increases significantly.

Reducing your back pain.

To prevent back pain it is necessary to alternate active sitting with passive sitting. What do we mean with that? Active sitting is when you straighten your back, and sit upright with help of your own muscle activity. It is the best posture to protect disc damage. The problem is, you can only maintain it actively for 3-5 minutes maximum. After that, most people start slumping and leaning. This is what increases disc pressure. 

A good chair will allow you to sit actively, and support you when fatigue strikes and you want to lean back. It is important that the support is precisely localized where needed, while allowing for freedom of movement in other directions. 

By alternating active sitting with passive sitting, the internal disc pressure gets evened out and the train on the surrounding weak tissue reduced.

A good chair.

A good chair or a good stool has an adequate seat tilt, and an adequate lumbar support. Adequate in the sense of well measured localized pressure. Our chairs and stools are all designed according to these principles. The lumbar support is kept small for this purpose, so it can provide support where needed to effectively support the disc, and allow for freedom of movement in all other directions which remains equally important.

What is a good seat height?

A good seat height depends on a two measurements: your body height and your work surface height. It is important that the seat angle (that is the angle between your legs and your lower back) is wide enough so that the pelvis can tilt sufficiently and allow your lumbar spine to fully stretch. This means that for our stools we advise a 110-130 degree angle, for desk chairs a 100-110 degree angle. This requires less energy to maintain your posture, and reduces back complaints. It also allows for free circulation flow and creates a neutral position for the hip joint; all resulting in a comfortable seat that you can maintain for a full day without getting fatigued.

Improve your posture.

Chairs and stools from Back Quality Ergonomics have been scientifically developed (based on empiric studies) to specifically meet the needs of all those who struggle with lower back and neck complaints, disc problems, or fatigue symptoms due to bad posture.