Objectives: The objectives were to measure lean tissue hydration and density in a large sample of children and adolescents and to derive prediction equations.
Design: Body composition was measured in 533 healthy individuals (91% white) aged 4-23 y by using the 4-component model. Age- and sex-specific median values for PD98059 cost hydration and density were obtained by using the LMS (lambda, mu, sigma) method. Regression analysis was used to generate prediction equations on the basis
of age, sex, and body mass index SD score (BMI SDS). Values were compared with those in previously published predictions.
Results: Age-associated changes in density and hydration differed between the sexes. Compared with our empirical values, use of published values resulted in a mean bias of 2.1% fat (P < 0.0001). Age, sex, and BMI SDS were all significant predictors of lean tissue hydration and density. With adjustment for age and sex, hydration was higher, and density lower, in higher-BMI SDS individuals.
Conclusions: The chemical maturation of lean tissue is not a linear process and proceeds differently in males and females. Previously published reference values
are inaccurate and induce clinically significant bias in percentage fat. New empirical see more reference values are provided for use in pediatric hydrometry and densitometry. Further research that extends
to cover nonwhite ethnic groups is needed. Am J Clin Nutr 2010;91:610-8.”
“The purpose of this research was to investigate the water absorption behavior and associated dimensional stability of kenaf-polypropylene-filled (PP/KF) composites. Composites with different fiber loadings, ranging from 0 to 40 wt %, were prepared with a twin-screw extruder followed by hot press molding. The influence of the compatibilizer was also studied for CCI-779 chemical structure PP/KF composite with 5 wt % maleated PP (MAPP). Water absorption testing was carried out at room temperature for 7 weeks. Tensile, flexural, and impact tests were also performed on control, wet, and re-dried specimens. Increasing the fiber content resulted in higher water absorption and thickness swelling. The inferior mechanical properties of the wet composites were attributed to the effect of water, which deteriorates the interfacial properties of composites. On re-drying, all properties were almost recovered because of the recovery of interfacial area as evident in scanning electron micrographs. Incorporation of the MAPP significantly improved the compatibility between the fiber and matrix and the mechanical properties of the composites compared with those without MAPP. It also diminished the water absorption as well as the related thickness swelling in the composites. (C) 2010 Wiley Periodicals, Inc.