Measuring physical fitness in persons with severe or profound intellectual and multiple disabilities Waninge, Aly

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Publication date: 2011 Link to publication in University of Groningen/UMCG research database

Citation for published version (APA): Waninge, A. (2011). Measuring physical fitness in persons with severe or profound intellectual and multiple disabilities Groningen: s.n.

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Download date: 22-01-2017

Chapter 3

Measuring waist circumference in disabled adults. A. Waninge K. A. M. Ligthart J. Kramer S. Hoeve C.P. van der Schans H.H. Haisma

Research in Developmental Disabilities 31(3):839-847. Reproduced by courtesy of Elsevier

Chapter 3 | 39

Abstract To date, it is unknown whether waist circumference can be measured validly and reliably when a subject is in a supine position. This issue is relevant when international standards for healthy participants are applied to persons with severe intellectual, sensory, and motor disabilities. Thus, the aims of our study were (1) to determine the validity of waist circumference measurements obtained in a supine position, (2) to formulate an equation that predicts standing waist circumference from measurements obtained in a supine position, and (3) to determine the reliability of measuring waist circumference in persons with severe intellectual, sensory, and motor disabilities. First, we performed a validity study in 160 healthy participants, in which we compared waist circumference obtained in standing and supine positions. We also conducted a test-retest study in 43 participants with severe intellectual, sensory, and motor disabilities, in which we measured the waist circumference with participants in the supine position. Validity was assessed with paired t-test and Wilcoxon signed rank test. A prediction equation was estimated with multiple regression analysis. Reliability was assessed by Wilcoxon signed rank test, limits of agreement (LOA), and intraclass correlation coefficients (ICC). Paired t-test and Wilcoxon signed rank test revealed significant differences between standing and supine waist circumference measurements. We formulated an equation to predict waist circumference (R2=0.964, p