Effect of computer keyboard slope and height on wrist extension angle

摘要

The goal of this study was to determine the systematic effect that varying the slope angle of a computer keyboard along with varying keyboard height(relative to elbow height)have on wrist extension angle while typing. Thirty participants typed on a keyboard whose slope was adjusted to +15°,+7.5°,0°,-7.5°, and-7.5°, and -15°. The height of the keyboard was set up such that participants' wrists were at the same height as their elbows, above their elbows, and four cm below their elbows. Results showed that as keyboard slope angle moved downward from +°15°to -15°, mean wrist extension decreased approximately 13°(22°at +15° slope to 9°at -15° slope).