An adjustable, ergonomically designed chair can help you position yourself at the proper height for your workstation and allow you to more easily maintain a natural and comfortable posture. A well designed and fitted chair will have a back rest that provides you with proper lower back support. The chair should be able to be adjusted to suit your specific body dimensions and the types of tasks that you perform. It is important to know how to adjust your chair for maximum comfort.
Take some time to familiarize yourself with the adjustable features of your chair (e.g. chair height, tilt, arm rests).
Chair Height and Tilt
- Adjust the height of your chair so that your feet rest flat on the floor.
- If your keyboard/mouse tray is not height adjustable and you have to raise your chair to comfortably use these devices, use a footrest to fully support your feet and eliminate any discomfort due to pressure on the underside of your thighs.
- Your thighs should be parallel to the floor with about a 90-110 degree angle at the hips.
- The backrest should provide adequate support for the natural curve of your back, especially in the lower back or lumbar region.
- Some chairs allow you to adjust the backrest height and angle to improve comfort and support.
- An adjustable backrest angle allows you to adopt different postures while still maintaining good lumbar support.
- The depth of the seat pan should be such that you can sit with your back fully supported against the chair’s backrest and have about 2-3 finger-widths clearance between the back of your knees and the front edge of the seat.
- The front edge of the seat should be rounded or downward-curving to reduce the pressure on the underside of your thighs.
- The chair should be made out of breathable materials that can dissipate moisture and heat.
- The chair’s armrests should not impede natural arm movements while typing or using the mouse and should not interfere with positioning the chair close in to the workstation.
- Position the height of the armrests to just below elbow level so you do not have to raise your shoulders while resting.
- While resting, avoid leaning your body to one side and supporting your upper body weight on one armrest only.
For proper stability and mobility, the chair should have a five-prong base with appropriate casters.