Selection of Variables
Our own review of the ADAAG requirements, plus that of our subcontractor KRW, reveals that the single most needed anthropometric datum, by far, is arm length. Sitting height is also important for drawing up standards listed in the ADAAG, as are some dozen other assorted variables such as grip strength and foot length. Planning and executing even a relatively small anthropometric survey is a costly undertaking and if it is to be done, the addition of a reasonable number of variables for which there will clearly be other uses, such as wheelchair design, will not significantly add to the cost. For this survey we suggest variables that fall into five categories:
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basic body size descriptors
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reach and functional reach measurements
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arm and hand strength measurements
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field of vision measurements
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wheelchair/user measurements
A tentative list of variables to be measured would be as follows:
A | Acromion height, sitting; arm length (acromion to fingertip); biacromial breadth; buttock-heel length; eye height, sitting; foot breadth; foot length; knee height, sitting; maximum elbow span; sitting abdominal breadth; sitting chest depth; sitting height from chair; weight |
B | Reaches: all reaches measured forward, vertically, and out to the side; fingertip reach [toggle switches, buttons]; thumbtip reach [knobs]; grip reach [whole-hand operations] |
C | Hand strength [operating equipment]; arm strength [transfers] |
D | Field of vision [up, sideways, down] |
E | Measurements of chair and user (floor to top of head, side to side, back to front, height to armrest, height to seat) [accessibility] |
The two most basic dimensions measured in every non-disabled population are height and weight. Neither of these are used directly in the design of clothing, equipment or workspaces. They are taken for a number of other reasons having to do with comparability of samples and garment sizing indicators. Weight is included here as a recommended dimension because a variety of engineering problems require body weight. Stature (standing height) seems not to be relevant to a population that does not stand, but height to the top of the head while sitting in the wheelchair is potentially useful.
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