Biomaterial Database

Fat-free mass in Japanese boys predicted from bioelectrical impedance and anthropometric variables. 1994

H K Kim, and K Tanaka, and F Nakadomo, and K Watanabe

Institute of Health and Sport Sciences, University of Tsukuba, Japan.

OBJECTIVE To develop the best prediction equation for estimating fat-free mass (FFM) from bioelectrical impedance and anthropometric variables in Japanese boys. METHODS 141 boys, aged 9-14 years, were recruited from elementary schools managed by Osaka City. METHODS FFM was calculated from underwater weighting (UW) using a two-component model. Prediction equations were developed using multiple regression analyses. Adjusted R2 and standard errors of the estimate (SEE) ranged from 0.831 to 0.854 and from 1.25 to 1.80 kg in the validation group (n = 84), and ranged from 0.817 to 0.912 and from 1.27 to 1.86 kg in the cross-validation group (n = 57), respectively. The validation group and cross-validation group were combined in order to develop a more stable prediction equation with a greater sample size (n = 141). RESULTS The variables ZI (height2/impedance), body mass (M) and abdominal skinfold thickness were found to be the best combination of predictors. Adjusted R2 and SEE for finally developed regression equations ranged from 0.949 to 0.975 and from 1.50 to 2.10 kg. CONCLUSIONS As a result of all analyses and considering the practicability of the measurement, we recommend the equation FFM = 0.56ZI+0.20M+1.66, with an adjusted R2 of 0.971 and SEE of 1.59 kg, which can predict FFM with high precision in Japanese boys.

UI	MeSH Term	Description	Entries
D007564	Japan	A country in eastern Asia, island chain between the North Pacific Ocean and the Sea of Japan, east of the Korean Peninsula. The capital is Tokyo.	Bonin Islands
D008297	Male		Males
D011237	Predictive Value of Tests	In screening and diagnostic tests, the probability that a person with a positive test is a true positive (i.e., has the disease), is referred to as the predictive value of a positive test; whereas, the predictive value of a negative test is the probability that the person with a negative test does not have the disease. Predictive value is related to the sensitivity and specificity of the test.	Negative Predictive Value,Positive Predictive Value,Predictive Value Of Test,Predictive Values Of Tests,Negative Predictive Values,Positive Predictive Values,Predictive Value, Negative,Predictive Value, Positive
D012044	Regression Analysis	Procedures for finding the mathematical function which best describes the relationship between a dependent variable and one or more independent variables. In linear regression (see LINEAR MODELS) the relationship is constrained to be a straight line and LEAST-SQUARES ANALYSIS is used to determine the best fit. In logistic regression (see LOGISTIC MODELS) the dependent variable is qualitative rather than continuously variable and LIKELIHOOD FUNCTIONS are used to find the best relationship. In multiple regression, the dependent variable is considered to depend on more than a single independent variable.	Regression Diagnostics,Statistical Regression,Analysis, Regression,Analyses, Regression,Diagnostics, Regression,Regression Analyses,Regression, Statistical,Regressions, Statistical,Statistical Regressions
D001823	Body Composition	The relative amounts of various components in the body, such as percentage of body fat.	Body Compositions,Composition, Body,Compositions, Body
D001827	Body Height	The distance from the sole to the crown of the head with body standing on a flat surface and fully extended.	Body Heights,Height, Body,Heights, Body
D002648	Child	A person 6 to 12 years of age. An individual 2 to 5 years old is CHILD, PRESCHOOL.	Children
D005069	Evaluation Studies as Topic	Works about studies that determine the effectiveness or value of processes, personnel, and equipment, or the material on conducting such studies.	Critique,Evaluation Indexes,Evaluation Methodology,Evaluation Report,Evaluation Research,Methodology, Evaluation,Pre-Post Tests,Qualitative Evaluation,Quantitative Evaluation,Theoretical Effectiveness,Use-Effectiveness,Critiques,Effectiveness, Theoretical,Evaluation Methodologies,Evaluation Reports,Evaluation, Qualitative,Evaluation, Quantitative,Evaluations, Qualitative,Evaluations, Quantitative,Indexes, Evaluation,Methodologies, Evaluation,Pre Post Tests,Pre-Post Test,Qualitative Evaluations,Quantitative Evaluations,Report, Evaluation,Reports, Evaluation,Research, Evaluation,Test, Pre-Post,Tests, Pre-Post,Use Effectiveness
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000273	Adipose Tissue	Specialized connective tissue composed of fat cells (ADIPOCYTES). It is the site of stored FATS, usually in the form of TRIGLYCERIDES. In mammals, there are two types of adipose tissue, the WHITE FAT and the BROWN FAT. Their relative distributions vary in different species with most adipose tissue being white.	Fatty Tissue,Body Fat,Fat Pad,Fat Pads,Pad, Fat,Pads, Fat,Tissue, Adipose,Tissue, Fatty