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Body positioning impacts activity. However each person is different, thus requiring adjustable furniture to allow individual workers to work in a neutral posture. Seat height and shape is determined by lower leg length. Sitting in a forward tilt chair will assist in upright position of the spine and head. The chair is a tool just like the computer, if the employee is not positioned properly, productivity will suffer as will the employee. The well-designed and selected chair improves seated posture and circulation while decreasing fatigue.
The chair's seat should be wide and deep enough to evenly distribute body weight, yet leave a little room behind the knees for leg movement. Seat height should adjust to keep the user's feet on the floor or a footrest, while they feel uniform weight pressures along their thighs and buttocks. Reclined tasks require a somewhat larger backrest, and the seat should have a negative slope. Forward leaning tasks call for a smaller backrest (or no backrest), and a positive seat slope. Any backrest should have both height and angle adjustment, so user's can place the support where they want it.
Adjustable height armrests help support the worker's arms and neck in certain tasks, and aid in entering or exiting the chair. The front of the seat should have a waterfall shape to relieve pressure on the thigh's blood vessels. Five legs and twin wheel casters ensure stability and smooth rolling on carpeting or hard wood floors. The user should be able to move on the chair too - rock back and forth if they like - and make adjustments from a seated position.
Click here to download information on how to properly measure for a chair.
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