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Assessment of body composition by air-displacement plethysmography: influence of body temperature and moisture.

Fields DA, Higgins PB, Hunter GR - Dyn Med (2004)

Bottom Line: METHODS: %fat, body volume and density by the BOD POD before (BOD PODBH) and immediately following hydrostatic weighing (BOD PODFH) were performed in 32 healthy females (age (yr) 33 +/- 11, weight (kg) 64 +/- 14, height (cm) 167 +/- 7).RESULTS: BOD PODFH %fat (27.1%) and body volume (61.5 L) were significantly lower (P </= 0.001) and body density (1.0379 g/cm3) significantly higher (P </= 0.001) than BOD PODBH %fat (28.9%), body volume (61.7 L), and body density (1.0341 g/cm3).CONCLUSION: These data demonstrate for the first time that increases in body heat and moisture result in an underestimation of body fat when using the BOD POD, however, the precise mechanism remains unidentified.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Health and Exercise Sciences, University of Oklahoma, Norman, OK, USA. dafields@ou.edu

ABSTRACT
BACKGROUND: To investigate the effect of body temperature and moisture on body fat (%fat), volume and density by air-displacement plethysmography (BOD POD). METHODS: %fat, body volume and density by the BOD POD before (BOD PODBH) and immediately following hydrostatic weighing (BOD PODFH) were performed in 32 healthy females (age (yr) 33 +/- 11, weight (kg) 64 +/- 14, height (cm) 167 +/- 7). Body temperature and moisture were measured prior to BOD PODBH and prior to BOD PODFH with body moisture defined as the difference in body weight (kg) between the BOD PODBH and BOD PODFH measurements. RESULTS: BOD PODFH %fat (27.1%) and body volume (61.5 L) were significantly lower (P

No MeSH data available.


Related in: MedlinePlus

Panel A is the regression of body density (g/cm3) determined by BOD PODBH before hydrostatic weighing against body density determined by BOD PODFH following hydrostatic weighing. The dotted line is the line of identity (regression slope = 1 and regression intercept = 0). The regression line did not significantly deviate from the line of identity. Panel B are the residuals from linear regressions of body density BOD PODBH on body density from the BOD PODFH. The middle line represents the mean difference while the upper and lower dashed lines represent ±2 SD from the mean. No bias was observed as indicated by the non-significant P value.
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Figure 2: Panel A is the regression of body density (g/cm3) determined by BOD PODBH before hydrostatic weighing against body density determined by BOD PODFH following hydrostatic weighing. The dotted line is the line of identity (regression slope = 1 and regression intercept = 0). The regression line did not significantly deviate from the line of identity. Panel B are the residuals from linear regressions of body density BOD PODBH on body density from the BOD PODFH. The middle line represents the mean difference while the upper and lower dashed lines represent ±2 SD from the mean. No bias was observed as indicated by the non-significant P value.

Mentions: Linear regression analysis revealed that the regression of BOD PODBH %fat vs. BOD PODFH %fat significantly deviated from the line of identity, P ≤ 0.005 (Figure 1 panel A), though no bias was found across the range of body fatness P = 0.66 (Figure 1 panel B). However, BOD PODBH body density versus BOD PODFH body density did not significantly deviate from the line of identity (Figure 2 panel A) and no significant bias was observed between body density estimates across the range of fatness P = 0.36 (Figure 2 panel B).


Assessment of body composition by air-displacement plethysmography: influence of body temperature and moisture.

Fields DA, Higgins PB, Hunter GR - Dyn Med (2004)

Panel A is the regression of body density (g/cm3) determined by BOD PODBH before hydrostatic weighing against body density determined by BOD PODFH following hydrostatic weighing. The dotted line is the line of identity (regression slope = 1 and regression intercept = 0). The regression line did not significantly deviate from the line of identity. Panel B are the residuals from linear regressions of body density BOD PODBH on body density from the BOD PODFH. The middle line represents the mean difference while the upper and lower dashed lines represent ±2 SD from the mean. No bias was observed as indicated by the non-significant P value.
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Related In: Results  -  Collection

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Figure 2: Panel A is the regression of body density (g/cm3) determined by BOD PODBH before hydrostatic weighing against body density determined by BOD PODFH following hydrostatic weighing. The dotted line is the line of identity (regression slope = 1 and regression intercept = 0). The regression line did not significantly deviate from the line of identity. Panel B are the residuals from linear regressions of body density BOD PODBH on body density from the BOD PODFH. The middle line represents the mean difference while the upper and lower dashed lines represent ±2 SD from the mean. No bias was observed as indicated by the non-significant P value.
Mentions: Linear regression analysis revealed that the regression of BOD PODBH %fat vs. BOD PODFH %fat significantly deviated from the line of identity, P ≤ 0.005 (Figure 1 panel A), though no bias was found across the range of body fatness P = 0.66 (Figure 1 panel B). However, BOD PODBH body density versus BOD PODFH body density did not significantly deviate from the line of identity (Figure 2 panel A) and no significant bias was observed between body density estimates across the range of fatness P = 0.36 (Figure 2 panel B).

Bottom Line: METHODS: %fat, body volume and density by the BOD POD before (BOD PODBH) and immediately following hydrostatic weighing (BOD PODFH) were performed in 32 healthy females (age (yr) 33 +/- 11, weight (kg) 64 +/- 14, height (cm) 167 +/- 7).RESULTS: BOD PODFH %fat (27.1%) and body volume (61.5 L) were significantly lower (P </= 0.001) and body density (1.0379 g/cm3) significantly higher (P </= 0.001) than BOD PODBH %fat (28.9%), body volume (61.7 L), and body density (1.0341 g/cm3).CONCLUSION: These data demonstrate for the first time that increases in body heat and moisture result in an underestimation of body fat when using the BOD POD, however, the precise mechanism remains unidentified.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Health and Exercise Sciences, University of Oklahoma, Norman, OK, USA. dafields@ou.edu

ABSTRACT
BACKGROUND: To investigate the effect of body temperature and moisture on body fat (%fat), volume and density by air-displacement plethysmography (BOD POD). METHODS: %fat, body volume and density by the BOD POD before (BOD PODBH) and immediately following hydrostatic weighing (BOD PODFH) were performed in 32 healthy females (age (yr) 33 +/- 11, weight (kg) 64 +/- 14, height (cm) 167 +/- 7). Body temperature and moisture were measured prior to BOD PODBH and prior to BOD PODFH with body moisture defined as the difference in body weight (kg) between the BOD PODBH and BOD PODFH measurements. RESULTS: BOD PODFH %fat (27.1%) and body volume (61.5 L) were significantly lower (P

No MeSH data available.


Related in: MedlinePlus