Body composition measurement by air displacement plethysmography in pregnancy: Comparison of predicted versus measured thoracic gas volume

Nutrition ◽  
2019 ◽  
Vol 60 ◽  
pp. 227-229 ◽  
Author(s):  
Outi Pellonperä ◽  
Ella Koivuniemi ◽  
Tero Vahlberg ◽  
Kati Mokkala ◽  
Kristiina Tertti ◽  
...  
Keyword(s):  
Body Composition ◽  
Air Displacement Plethysmography ◽  
Body Composition Measurement ◽  
Thoracic Gas Volume ◽  
Composition Measurement ◽  
Gas Volume ◽  
In Pregnancy

Body composition by air-displacement plethysmography by using predicted and measured thoracic gas volumes

1998 ◽  
Vol 84 (4) ◽  
pp. 1475-1479 ◽  
Author(s):  
Megan A. McCrory ◽  
Paul A. Molé ◽  
Terri D. Gomez ◽  
Kathryn G. Dewey ◽  
Edmund M. Bernauer
Keyword(s):  
Body Composition ◽  
Body Volume ◽  
Air Displacement Plethysmography ◽  
Bod Pod ◽  
Individual Basis ◽  
Thoracic Gas Volume ◽  
Significant Difference ◽  
Hydrostatic Weighing ◽  
Gas Volume ◽  
Boyle’S Law

The BOD POD, a new air-displacement plethysmograph for measuring human body composition, utilizes the inverse relationship between pressure and volume (Boyle’s law) to measure body volume directly. The quantity of air in the lungs during tidal breathing, the average thoracic gas volume (Vtg), is also measured by the BOD POD by using a standard plethysmographic technique. Alternatively, the BOD POD provides the use of a predicted Vtg (Vtgpred). The validity of using Vtgpred in place of measured Vtg (Vtgmeas) to determine the percentage of body fat (%BF) was evaluated in 50 subjects (36 women, 14 men; ages 18–56 yr). There was no significant difference between Vtgmeas and Vtgpred (mean difference ± SE, 53.5 ± 63.3 ml) nor in %BF by using Vtgmeas vs. Vtgpred (0.2 ± 0.2 %BF). On an individual basis, %BF measured by using Vtgmeas vs. Vtgpred differed within ±2.0% BF for 82% of the subjects; maximum differences were −2.9 to +3.0% BF. For comparison, data from 24 subjects who had undergone hydrostatic weighing were evaluated for the validity of using predicted vs. measured residual lung volume (Vr pred vs. Vr meas, respectively). Differences between Vr meas and Vr pred and in %BF calculated by using Vr meas vs. Vr pred were significant (187 ± 46 ml and 1.4 ± 0.3% BF, respectively; P < 0.001). On an individual basis, %BF determined by using Vr meas vs. Vr preddiffered within ±2.0% BF for 46% of the subjects; maximum differences were −2.9 to +3.8% BF. With respect to %BF measured by air displacement, our findings support the use of Vtgpred for group mean comparisons and for purposes such as screening in young to middle-aged individuals. This contrasts with the use of Vr pred in hydrostatic weighing, which leads to significant errors in the estimation of %BF. Furthermore, although the use of Vtgpred has some application, determining Vtgmeas is relatively simple in most cases. Therefore, we recommend that the use of Vtgmeas remain as standard experimental and clinical practice.

scholarly journals Assessment and prediction of thoracic gas volume in pregnant women: an evaluation in relation to body composition assessment using air displacement plethysmography

2012 ◽  
Vol 109 (1) ◽  
pp. 111-117 ◽  
Author(s):  
Pontus Henriksson ◽  
Marie Löf ◽  
Elisabet Forsum
Keyword(s):  
Body Composition ◽  
Body Weight ◽  
Pregnant Women ◽  
Maternal Nutrition ◽  
Body Volume ◽  
Body Composition Assessment ◽  
Air Displacement Plethysmography ◽  
Bod Pod ◽  
Thoracic Gas Volume ◽  
Gas Volume

Assessment of body fat (BF) in pregnant women is important when investigating the relationship between maternal nutrition and offspring health. Convenient and accurate body composition methods applicable during pregnancy are therefore needed. Air displacement plethysmography, as applied in Bod Pod, represents such a method since it can assess body volume (BV) which, in combination with body weight, can be used to calculate body density and body composition. However, BV must be corrected for the thoracic gas volume (TGV) of the subject. In non-pregnant women, TGV may be predicted using equations, based on height and age. It is unknown, however, whether these equations are valid during pregnancy. Thus, we measured the TGV of women in gestational week 32 (n 27) by means of plethysmography and predicted their TGV using equations established for non-pregnant women. Body weight and BV of the women was measured using Bod Pod. Predicted TGV was significantly (P = 0·033) higher than measured TGV by 6 % on average. Calculations in hypothetical women showed that this overestimation tended to be more pronounced in women with small TGV than in women with large TGV. The overestimation of TGV resulted in a small but significant (P = 0·043) overestimation of BF, equivalent to only 0·5 % BF, on average. A Bland–Altman analysis showed that the limits of agreement were narrow (from − 1·9 to 2·9 % BF). Thus, although predicted TGV was biased and too high, the effect on BF was marginal and probably unimportant in many situations.

scholarly journals Effect of Thoracic Gas Volume Changes on Body Composition Assessed by Air Displacement Plethysmography after Rapid Weight Loss and Regain in Elite Collegiate Wrestlers

Sports ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 48 ◽  
Author(s):  
Emi Kondo ◽  
Keisuke Shiose ◽  
Yosuke Yamada ◽  
Takuya Osawa ◽  
Hiroyuki Sagayama ◽  
...  
Keyword(s):  
Weight Loss ◽  
Body Composition ◽  
Fat Free Mass ◽  
Dilution Method ◽  
Rapid Weight Loss ◽  
Body Composition Assessment ◽  
Air Displacement Plethysmography ◽  
Time Points ◽  
Thoracic Gas Volume ◽  
Gas Volume

We investigated the effect of rapid weight loss (RWL) and weight regain (WR) on thoracic gas volume (VTG) and body composition assessment using air displacement plethysmography (ADP) in male wrestlers. Eight male elite collegiate wrestlers completed a RWL regimen (6% of body mass) over a 53-h period, which was followed by a 13-h WR period. ADP was used at three time points (baseline (T1), post-RWL (T2) and post-WR (T3)) according to the manufacturer’s testing recommendations. The total body water and bone mineral content were estimated using the stable isotope dilution method and dual energy X-ray absorptiometry, respectively, at the same time points. Body composition was assessed with two-component (2C) or four-component (4C) models using either the measured VTG (mVTG) or predicted VTG (pVTG). Measured VTG increased from T1 to T2 (0.36 ± 0.31 L, p < 0.05) and decreased from T2 to T3 (−0.29 ± 0.15 L, p < 0.01). However, the changes in fat mass and fat free mass, which were calculated by both 2C and 4C models, were not significantly different when compared between calculations using mVTG and those using pVTG. Our results indicate that VTG significantly changes during RWL and WR, but both measured and predicted VTG can be used to assess changes in body composition during RWL and WR.

scholarly journals IGF-I, Growth, and Body Composition in Preterm Infants up to Term Equivalent Age

2021 ◽  
Vol 5 (7) ◽  
Author(s):  
Dana F J Yumani ◽  
Harrie N Lafeber ◽  
Mirjam M van Weissenbruch
Keyword(s):  
Body Composition ◽  
Preterm Infants ◽  
Fat Free Mass ◽  
Mass Percentage ◽  
Air Displacement Plethysmography ◽  
Equivalent Age ◽  
Body Composition Measurement ◽  
Igf I ◽  
Composition Measurement

Abstract Context There are concerns that a higher fat mass in the early life of preterm infants is associated with adverse cardiometabolic outcomes in young adulthood. Objective To investigate the role of IGF-I and growth in determining body composition of preterm infants at term equivalent age. Methods An observational study was conducted from August 2015 to August 2018. From birth to term equivalent age, IGF-I levels were measured bi-weekly and growth was assessed weekly. At term equivalent age, body composition was assessed through air displacement plethysmography; 65 infants with a gestational age of 24 to 32 weeks were assessed at term equivalent age, of whom 58 completed body composition measurement. The main outcome measures were fat (free) mass (g) and fat (free) mass percentage at term equivalent age. Results In the first month of life, each 0.1 nmol/L per week increase in IGF-I was associated with a 465 g (SE 125 g) increase in fat free mass. A greater increase in weight SDS in the first month of life was associated with a higher fat free mass percentage (B 200.9; 95% CI, 12.1-389.6). A higher head circumference SDS was associated with more fat free mass (r = 0.46; 95% CI, 0.21-0.65). However, a greater increase in weight SDS up to term equivalent age was associated with a lower fat free mass percentage (B −55.7, SE 9.4). Conclusion These findings suggest that impaired growth in the first month of life is associated with a less favorable body composition at term equivalent age.

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