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18.08.2004

Controlling a computer mouse with your left hand is better for your spine, joints and muscles than using the conventional way when the mouse is to the right of the keyboard.

Alvin Delyle of the Institute of Occupational Health and Safety in Montreal, Canada, asked 27 right-handed computer workers to move their mice to the left for a month. It turned out that in this case, the shoulder, arm and wrist make fewer movements and these movements have a much smaller amplitude than usual. Meanwhile, it is precisely these repetitive movements that can lead to occupational diseases of a computer engineer.

The reason for the improvement in ergonomics when using a mouse with the left hand is that the standard computer keyboard is not symmetrical. Directly in front of the typist are rows of letter keys. On the left, the keyboard ends with one row of service keys, and on the right, in addition to three rows of cursor keys, there is also a numeric keypad for entering numbers and calculations, consisting of four rows of keys. Therefore, the right hand is forced to deviate more from the middle position, reach for the mouse and make more movements.

The volunteers who participated in Delil's experiments became so accustomed to the left position of the mouse that by the end of the month they wielded it almost as dexterously as with the right position. And 16 of them did not return to the old order, considering it less convenient.

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