A Comparison of Body Density and Percent Body Fat as Computed Using Four Different Lung Volumes in the Hydrostatic Weighing Technique PDF Download
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Author: Dean Witherspoon
Publisher:
ISBN:
Category : Human body
Languages : en
Pages : 132
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Book Description
This study compared body density (BD) and percent body fat (%BF) arrived at by using four different lung volumes in the hydrostatic weighing (HW) procedure. The four lung volumes were residual volume as measured in air (RV-dry), residual volume as measured immersed in water (RV-wet), functional residual capacity, as measured immersed (FRC), and total lung capacity as measured immersed (TLC). The closed circuit oxygen dilution technique was used to measure all lung volumes.
Author: Dean Witherspoon
Publisher:
ISBN:
Category : Human body
Languages : en
Pages : 132
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Book Description
This study compared body density (BD) and percent body fat (%BF) arrived at by using four different lung volumes in the hydrostatic weighing (HW) procedure. The four lung volumes were residual volume as measured in air (RV-dry), residual volume as measured immersed in water (RV-wet), functional residual capacity, as measured immersed (FRC), and total lung capacity as measured immersed (TLC). The closed circuit oxygen dilution technique was used to measure all lung volumes.
Author: Kwai Ming Wa
Publisher:
ISBN:
Category : Adipose tissues
Languages : en
Pages : 278
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Book Description
Abstract: The purpose of this study was to compare the without head submersion (HWNHS) and total lung capacity (HWTLC) hydrostatic weighing techniques to the criterion measure of hydrostatic weighing at residual volume (HWRV). Subjects were 54 healthy males. In an attempt to improve the accuracy of HWNHS, regression analysis was used to predict actual head volume from spherical head volume (R2 = .27, standard error of estimate (SEE) = 42 6 mL). Predicted head volume was then added to total body volume (TBV) determined by HWNHS. TBV for all three techniques was corrected by subtracting the appropriate lung and gastro-intestinal volumes. Mean body density (Db) was 1.065 g/mL, 1.072 g/mL, and 1.072 g/mL for HWRV, HWTLC, and HWNHS, respectively. Mean percent body fat (% fat) was 15.10%, 11.85%, and 11.89% for HWRV, HWTLC, and HWNHS, respectively. Significant differences in mean Db and % fat were observed, with HWTLC and HWNHS overestimating Db and underestimating % fat from HWRV. Although correlations between the three hydrostatic weighing techniques were greater than .85, the SEEs for predicting % fat measured by HWRV were 3.49% and 3.25% for HWTLC and HWNHS, respectively.
Author: Nadine Patricia Moyer
Publisher:
ISBN:
Category : Body composition
Languages : en
Pages : 0
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Book Description
The reliability of two different makes of skinfold calipers, the Harpenden and the Lange, was tested on a group of physical education students. The reliabilities reported were almost identical. The accuracy of skinfold regression formulas for predicting density of the human body was also tested. The formulas of Young et al (57) and Sloan et al (49) did give an accurate estimate, but that of Katch and Michael (35) reported a non-significant correlation at the .05 level. Different techniques of hydrostatic weighing were examined and reliabilities were reported for each method. The inspiration technique using a measured residual volume gave the highest reliability. The residual volume was estimated and measured directly to determine if there would be a significant difference in body density between these two methods. However, when the mean of the scores was taken there was no significant difference at the .05 level. The body density estimate, obtained by hydrostatic weighing v/as used in three formulas, which had been developed by previous researchers, to estimate the percentage body fat. At the .05 level of significance there was no difference among the three estimates of percentage body fat.
Author: Chi Shing Lee
Publisher:
ISBN:
Category : Body composition
Languages : en
Pages : 114
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Book Description
Author: James W. Hill
Publisher:
ISBN:
Category : Adipose tissues
Languages : en
Pages : 88
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Book Description
Author: William B. Zuti
Publisher:
ISBN:
Category : Body composition
Languages : en
Pages : 200
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Book Description
Author: Holly Ann Grenier
Publisher:
ISBN:
Category : Body composition
Languages : en
Pages : 144
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Book Description
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 1140
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Book Description
Author: Beverly M. Yenzer
Publisher:
ISBN:
Category : Body composition
Languages : en
Pages : 192
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Book Description
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.
