6 Treston Workplace Chairs The ergonomic requirements of workplace chairs in industrial and technical environments are inherently different to those of other areas, such as offices. The jobs carried out at manufacturing workstations may involve force, precision skills and repetitive movements, and it is not always possible to adopt an ideal position in relation to the work piece. A workplace chair must adapt perfectly to the working environment and to the person, in order to Are you sitting well? A short introduction to workplace chair ergonomics enable necessary actions when seated – without adopting unhealthy positions or unnatural postures and without affecting productivity and efficiency. A good workplace chair adjusts easily to the person using it and supports the person doing the task in various working positions. Adjust the backrest so that its curvature supports the spine in the are of the 3rd and 4th lumbar vertebrae (approximately belt height). The bottom should be right at the back of the seat to fit its anatomically shaped contours. Only this posture ensures a contact with the backrest so that the user benefits of its support. The seat should slightly be inclined towards for jobs involving fine motor skills. Ideally, the chair will have a seat depth adjustment mechanism allowing the optimum setting for the length of the thighs. The seat is at the correct height when the upper arms and forearms for a right angle and the forearms are level with the working surface. At the same time, the angle between the thighs and lower legs should be at least 90 degrees. The feet should be flat on the floor or on a footrest. FEATURES OF A GOOD WORKPLACE CHAIR Suitability for the measurements of the person/user Supports the person in various working postures Promotes lumbar lordosis Minimizes static loading of the back muscle Easy adjustability Adjust the seat to the correct height Adjust the backrest height Use the entire surface of the seat ✓Adjust the chair, not the person ✓Unsupported sitting in an upright posture results in a 40 % increase in disc pressure compared to standing ✓Synchronous mechanism ✓For example with a reclined backrest ✓Adjustable work seat promotes productivity and reduces pains in shoulders and in the back ✓A backrest for the lower back ✓Seat tilt
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