Ergonomic Design of Calf Circumference Measuring Tape for Assessing Nutritional Status

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  • 栄養状態評価のための下腿周囲長メジャーの人間工学的デザイン
  • エイヨウ ジョウタイ ヒョウカ ノ タメ ノ カタイ シュウイチョウ メジャー ノ ニンゲン コウガクテキ デザイン

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The nutrition support team (NST) holds an important position in medical health care that specifically deals with malnutrition cases. A Mini Nutritional Assessment (MNA) is used as a standard method for judging the necessity for an NST intervention. There has been no prior examination of the measurement error and the design of measuring device necessary for assessing calf circumference (CC), an index contained in MNA. In this study, we designed a specialized, and ergonomically sound measuring tape for CC measurement. A number of factors were considered in the design of the measuring tape, including the addition of a rectangular cross to the long axis of a lower thigh, tension control of the tape, the difficulty of bending the tape and the ease of locating the maximum CC. Comparative experiments between the conventional products and the designed tape were conducted by 24 subjects. In contrast to the conventional product, the use of the designed tape resulted in a 30∼40% reduction in inner and intra individual errors, and a measuring time decrease from 17.4 to 10.3 seconds. The newly designed tape proved to be highly accurate and reliable in measuring CC, and its use will surely improve nutritional assessments.

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