Validity of the Futrex 5000 Estimation of Percent Body Fat of Women Using the Densiometric Criterion Measure of Hydrostatic Weighing PDF Download
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Author: Clifford J. Singhaus
Publisher:
ISBN:
Category : Body weight
Languages : en
Pages : 182
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Author: Clifford J. Singhaus
Publisher:
ISBN:
Category : Body weight
Languages : en
Pages : 182
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Author: Michael S. Wegner
Publisher:
ISBN:
Category : Body composition
Languages : en
Pages : 256
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Book Description
Accurate determinations of body composition, fat mass (FM) and fat-free mass (FFM) are of interest to scientists as well as many individuals who serve as health and fitness practitioners. Currently, researchers and practitioners use a variety of indirect methods to determine body composition. Traditional methods of estimating percent body fat include hydrostatic weighing, skinfold anthropometry and bioelectrical impedance. Dual energy x-ray absorptiometry (DEXA), utilized most commonly to determine bone mineral content, has recently been proposed to be an accurate measure in the assessment of body composition. Hologic Inc., manufacturers of the QDR-1000/W bone densitometer, have recently developed tissue composition software which can be used to estimate percent body fat in humans. Although the Hologic QDR-1000/W has been extensively evaluated for its accuracy in measuring tissue composition in "vitro", "in vivo" validation studies of body composition have been few. Therefore, the purpose of this study was to evaluate the accuracy of the Hologic QDR-1000/W in determining human body composition by comparing values for percent fat from DEXA to values derived using a multicomponent criterion measure of body composition in a group of 51 women and 50 men aged 19-82 years. Additionally, it was of interest to make comparisons of percent body fat determinations between the multicomponent criterion model and hydrostatic weighing, skinfold measures and bioelectrical impedance. All subjects completed the various body composition procedures used to estimate percent body fat: DEXA, hydrostatic weighing (2-component model), skinfold anthropometry and bioelectrical impedance. The multicomponent (4-component) criterion model procedures induded hydrostatic weighing (body density), DEXA whole body scanning (bone mineral content), and deuterium oxide (D20) dilution in respiratory water (total body water). Results of this study failed to reveal statistically significant mean percent body fat differences between hydrostatic weighing (2-component model) and the 4-component criterion model (25.2 ± 9.4 vs. 26.7 ± 8.4%, p> 0.05) for all 101 subjects. However, differences in percent body fat were found between the 4-component model (26.7 ± 8.4%) and dual energy x-ray absorptiometry (23.2 ± 7.9%), skinfold anthropometry (24.0 ± 8.5%) and bioelectrical impedance (23.4 ± 7.5%). Among women, hydrostatic weighing (2-component model), DEXA, skinfold anthropometry, and bioelectrical impedance all provided accurate estimates of percent body fat. However, each of the various indirect methods used to predict body composition underestimated percent body fat in men.
Author: Jacqueline Mary Kuta
Publisher:
ISBN:
Category :
Languages : en
Pages : 176
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Author: Jeffrey R. Stout
Publisher:
ISBN:
Category :
Languages : en
Pages : 54
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Author: Elaine M. Christelis
Publisher:
ISBN:
Category : Adipose tissues
Languages : en
Pages : 136
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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All U.S. Navy service members are required to meet percent body fat (%BF) standards as a condition of military service. Naval personnel who exceed standards for %BF can be separated from active duty. Currently, %BF predictions are determined by circumference measurements and a prediction equation (circumference equation = CEQ). In view of the importance these prediction results have for personnel retention, a validation study was undertaken to determine the accuracy of %BF prediction for a population determined to be overfat by the CEQ. The population for the validation study comprised men with 22%BF or greater and women with 30%BF or greater. Values for %BF were determined for 49 men and 50 women by hydrostatic weighing (HW) and circumference measurements at the Naval Submarine Medical Research Laboratory (NSMRL) using a regression equation developed at the Naval Health Research Center (NHRC), San Diego, California. The HW and CEQ values were compared to a superset of the original NHRC population. The correlation coefficients for the NSMRL validation group were lower than those reported in the original NHRC group. The results are attributed to the restricted range of NSMRL data and greater error of prediction at extreme ranges of values. A medical diagnostic model was used to evaluate the sensitivity, specificity, and predictive value of CEQ. It shows that the Navy's current procedures produce a 6.8 to 18% false positive rate for individual declared as having excess body fat. The data suggest that caution should be utilized when using the CEQ method for individual career decisions. Body fat, Prediction, Hydrostatic weighing, Circumference.
Author: Mark H. Gibbons
Publisher:
ISBN:
Category : Body composition
Languages : en
Pages : 114
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Author: Dierk Sandner
Publisher:
ISBN:
Category : Body composition
Languages : en
Pages : 242
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Author: Louann Pickens Johnston
Publisher:
ISBN:
Category : Adipose tissues
Languages : en
Pages : 76
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Author: Mannie E. Hall
Publisher:
ISBN:
Category : Body composition
Languages : en
Pages : 210
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