O FFICE FURNITURE AND EQUIPMENT Backrest shapes Preferred backrest shapes follow the curve of the backside (figure 18.15) Concave at the bottom for the buttocks, convex for the lumbar spine straightening for the upper back Work surface and keyboard support Height depends on the activities Main reference points are elbow and eye height Work surface of a sit down workplace should be adjustable Keyboard trays can be useful for high workspaces
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