AN ANALYSIS OF SITTING AREAS AND PRESSURES OF MAN
CIVIL AERONAUTICS MEDICAL RESEARCH LAB OKLAHOMA CITY OK
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Studies of sitting area on a plane rigid surface for a group of 104 male subjects were made. Area was found to vary with height and weight and to increase with age up to 40 years after which there is a steady decline. Means were 179.4 sq. in. for area and .92 poundssq. in. for average pressure. Sitting contact area was found to increase with experimentally applied force of magnitudes up to something less than body weight. Analysis of pressure distribution in the sitting area reveals that nearly half of the body weight is supported on 8 of the sitting area. This high pressure area is under or adjacent to the ischial tuberosities. Over one-third of the body weight on the sitting area is removed by the addition of a footrest, chair arms, and a slightly sloping seat back.
- Human Factors Engineering and Man Machine Systems