Mineral and Water Content of the Fat-Free Body: Effects of Gender, Maturation, Level of Fatness, and Age
| Autor: | R. J. Stillman, Richard A. Boileau, Constance B. Christ, Mary H. Slaughter |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Male
medicine.medical_specialty Percentile Time Factors Adolescent Endocrinology Diabetes and Metabolism Body water Medicine (miscellaneous) Biology Body Mass Index Sex Factors Endocrinology Animal science Body Water Bone Density Internal medicine medicine Humans Obesity Least-Squares Analysis Child Water content Minerals Body Weight Age Factors Public Health Environmental and Occupational Health Fat free body Regression analysis Body density Skinfold Thickness Adipose Tissue Sample size determination Multivariate Analysis Body Composition Regression Analysis Bone mineral content Female Basal Metabolism Food Science |
| Zdroj: | Obesity Research. 1:40-49 |
| ISSN: | 1071-7323 |
| Popis: | Variability associated with the effects of gender, level of fatness (LOF), maturation (ML), and age on the mineral (MFFB) and water (WFFB) content of the fat-free body (FFB) was investigated in 188 males and 144 females, aged 8 to 17 years. Measures of body density, bone mineral content, total body water, and skin-fold thicknesses were obtained. FFB was calculated using a multicomponent model based on body density and adjusting for variability in body water and mineral content. Subjects were classified by ML as prepubescent, pubescent, and postpubescent. Subjects were also grouped by LOF as lean, average, and obese based on percentile rankings from the age-related norms of the National Children and Youth Fitness Study. Least squares multiple regression analysis using weighted orthogonal contrasts to account for sample size differences revealed significant (p.01) gender, ML, gender x LOF, and gender x ML effects for MFFB; however, no significant (p.05) effects between, or within, gender were noted for WFFB. Significant ML, and nearly significant (p.056) LOF x ML, effects were found for MFFB in the males. In contrast, only ML was significant within the female sample for MFFB. These results were upheld when age, rather than ML, was used in the analysis. The overall relative increase in MFFB across ML was greatest in the obese (17.4%, 9.3%) and least in the lean (11.3%, 6.3%) males and females, respectively. A significant increase in MFFB across ML was observed in both genders; however, the pattern and magnitude of increase is dependent upon LOF considered. Hence, consideration of gender, ML, LOF and age is essential in estimating body composition in children. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text