Age and sex-standardised lean and fat indices derived from bioelectrical impedance anaylsis for ages 7-11 years: functional associations with cardio-respiratory fitness and grip strength

Sherriff, A. , Reilly, J.J., Wright, C.M. , McColl, J., Ness, A. and Emmett, P. (2009) Age and sex-standardised lean and fat indices derived from bioelectrical impedance anaylsis for ages 7-11 years: functional associations with cardio-respiratory fitness and grip strength. British Journal of Nutrition, 101(12), pp. 1753-1760. (doi:10.1017/S0007114508135814) (PMID:19025717)

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Abstract

Indices for lean and fat mass adjusted for height derived from bioelectrical impedance for children aged 7 years have been published previously and their usefulness in the clinical assessment of undernutrition has been demonstrated. However, there is a need for norms that cover a wider age range and to explore their functional significance. The aim of the present study is to derive lean and fat indices for children aged 7–11 years and investigate associations with objective measures of cardio-respiratory fitness and grip strength. Subjects were 9574 children participating in the Avon Longitudinal Study of Parents and Children (ALSPAC). Bioelectrical impedance analysis (BIA) data collected longitudinally between ages 7 and 11 were used to derive lean and fat indices using the method of standardised residuals. Cardio-respiratory fitness (CRF) (9 years) and grip strength (11 years) were also measured. Correlation coefficients and 95% CI were calculated to assess the strength of association between lean index, fat index and CRF and grip strength. Equations for calculating lean and fat indices in children aged 7–11 years relative to the ALSPAC population are presented. Lean index was linearly associated with CRF (rboys 0·20 (95% CI 0·15, 0·25), rgirls 0·26 (95% CI 0·22, 0·30)) and grip strength (rboys 0·29 (95% CI 0·26, 0·32), rgirls 0·26 (95% CI 0·23, 0·29)). BMI showed slightly weaker associations, while fat index was unrelated to either CRF or grip strength. Lean indices relate to muscle function and fitness while fat index does not.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:McColl, Professor John and Sherriff, Dr Andrea and Wright, Professor Charlotte and Reilly, Prof John
Authors: Sherriff, A., Reilly, J.J., Wright, C.M., McColl, J., Ness, A., and Emmett, P.
Subjects:R Medicine > RA Public aspects of medicine
College/School:College of Medical Veterinary and Life Sciences > School of Medicine, Dentistry & Nursing > Clinical Specialities
College of Medical Veterinary and Life Sciences > School of Medicine, Dentistry & Nursing > Dental School
College of Science and Engineering > School of Mathematics and Statistics > Statistics
Journal Name:British Journal of Nutrition
Journal Abbr.:Brit. J. Nutr.
Publisher:Cambridge University Press
ISSN:0007-1145
ISSN (Online):1475-2662
Published Online:14 May 2009

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