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      Effect of Body Build on the Validity of Predicted Body Fat from Body Mass Index and Bioelectrical Impedance

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          Abstract

          The objective of this study was to test whether differences between body fat percent (BF%) measured by densitometry and BF% predicted from body mass index (BMI) or bioimpedance (BIA) can be explained by differences in body build. Weight, height, sitting height (leg length), arm length, skeletal widths, BIA, bone mineral content from dual-energy X-ray absorptiometry, and BF% from densitometry were measured in 90 apparently healthy, young adult subjects (age range 18–31 years). The BMI was calculated and BF% predicted from BMI, age, and sex. BF% was also predicted from BIA. BF% measured by densitometry was 29.3 ± 5.0% for women and 14.6 ± 5.1% for men. BF% predicted from BIA (27.1 ± 6.7% in women, 19.0 ± 6.0% in men) was significantly different from measured values in both sexes. BF% predicted from BMI (25.9 ± 2.2% for women, 15.6 ± 2.4% for men) was only significantly different from BF% from densitometry in women, not in men. In both sexes skeletal widths, especially elbow width, were related to the prediction error of BF% from BMI, confirming the hypothesis that BF% predicted from BMI underestimates BF% in persons with a relatively slender body build or frame. The prediction error of BF% from BIA was found to be related to the length of the arms and legs, confirming the hypothesis that BIA overestimates BF% in persons with relatively long limbs.

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          Author and article information

          Journal
          ANM
          Ann Nutr Metab
          10.1159/issn.0250-6807
          Annals of Nutrition and Metabolism
          S. Karger AG
          0250-6807
          1421-9697
          1999
          October 1999
          28 January 2000
          : 43
          : 5
          : 277-285
          Affiliations
          Department of Human Nutrition and Epidemiology, Wageningen Agricultural University, Wageningen, The Netherlands
          Article
          12795 Ann Nutr Metab 1999;43:277–285
          10.1159/000012795
          10749027
          9fa97d5a-f5cf-4daa-a7a5-4c03da9b1b21
          © 2000 S. Karger AG, Basel

          Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

          History
          Page count
          Figures: 2, Tables: 4, References: 27, Pages: 9
          Categories
          Original Paper

          Nutrition & Dietetics,Health & Social care,Public health
          Body mass index,Body composition,Frame size,Anthropometry,Bioimpedance,Densitometry,Dual-energy X-ray absorptiometry,Body fat percent,Body build

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