A new air displacement method for the determination of human body composition

Dempster, Philip; Aitkens, Susan G.

doi:10.1249/00005768-199512000-00017

Cited by 570 publications

(551 citation statements)

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“…TBW: TBW was obtained from isotopic dilution 24 Body Volume: Air-displacement plethysmography measurements were performed using the BodPod ® (Life Measurement Inc., Concord, CA, USA; software version 1.69), calibrated prior to each measurement 27 and completed twice or until the body volume (BV) measurements were within 150 ml or 0.2% of each other. The average of the two successful measurements was taken.…”

Section: C Body Composition Model (Reference Method)mentioning

confidence: 99%

A Bedside Measure of Body Composition in Duchenne Muscular Dystrophy

Elliott

Davidson

Davies

et al. 2015

Pediatric Neurology

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Introduction:In clinical practice, monitoring body composition is a critical component of nutritional assessment and weight management in boys with Duchene muscular dystrophy (DMD). We aimed to evaluate the accuracy of a simple bedside measurement tool for body composition, namely bioelectrical impedance analysis (BIA), in boys with DMD. Methods:Measures of fat free mass (FFM) were determined using a BIA machine and compared against estimations obtained from a reference body composition model. Additionally, the use of raw impedance values were analysed using three existing predictive equations 1-3 for the estimation of FFM. Accuracy of BIA was assessed by comparison against the reference model by calculation of biases and limits of agreement.Results: Body composition was measured in ten boys with DMD, mean age 9.01 ± 2.34 years. The BIA machine values of FFM were on average 2.3 ± 14.1 kg higher than reference values. Limits of agreement (based on 95 % CI of the mean) were -7.4 to 2.9 kg. There was a significant correlation between the mean FFM and difference in FFM between the BIA machine and the reference model (r = -0.86, p= 0.02) suggesting that the bias was not consistent across the range of measurements. The most accurate predictive equation for the estimation of FFM using raw impedance values was Pietrobelli's 3 ; mean difference -0.7 kg, 95 % limits of agreement (-3.5 to 2.0 kg). Conclusion:In a clinical setting, where a rapid assessment of body composition is advantageous, the use of raw impedance values, combined with the Pietrobelli 3 equation, is recommended for the accurate estimation of FFM, in boys with DMD.

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Section: C Body Composition Model (Reference Method)mentioning

confidence: 99%

A Bedside Measure of Body Composition in Duchenne Muscular Dystrophy

Elliott

Davidson

Davies

et al. 2015

Pediatric Neurology

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“…This accounted for a negative volume owing to a more compressible air induced by the isothermal conditions associated with the skin surface area. 22 Siri's 23 two-compartment formula was used to calculate percentage body fat (FM%) from body density. From FM% and body weight, total FM (kg) and total fat-free mass (FFM) (kg) were calculated.…”

Section: Adpmentioning

confidence: 99%

Validity of the leg-to-leg bioimpedance to estimate changes in body fat during weight loss and regain in overweight women: a comparison with multi-compartment models

et al. 2006

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Objectives: To investigate changes in body composition and the validity of the leg-to-leg bioimpedance (LTL) method to measure body fat during active weight loss (WL) and weight regain (WR). Design: Longitudinal, 12-week weight loss intervention (3.3-3.8 MJ/day) and subsequent follow-up at 1 year. Subjects: Fifty-eight adult women aged between 24 and 65 years (mean age: 46.878.9 years) and with a body mass index (BMI) X25 kg/m 2 (mean BMI: 31.672.5 kg/m 2 , range ¼ 26.0-48.2 kg/m 2 ) participated in the study. Measurements: Fat mass (FM) was measured at baseline, 12 weeks, 24 weeks and 52 weeks using three-and four-compartment (4-C) models, air displacement plethysmography (ADP), deuterium dilution -total body water (TBW), dual-energy X-ray absorptiometry (DXA), skinfold thickness (SFT), tetrapolar bioelectrical impedance analysis (T-BIA) and LTL. Results: At the end of the weight loss programme, subjects lost 9.973.5 kg weight (Po0.001) and 7.670.5 kg fat (Po0.001) but after 1 year they had regained 4.973.7 kg of weight and 3.772.9 kg of fat. The 4-C model showed that FM and TBW accounted for 76.2 and 23.6% of the loss in body mass and 81.8 and 17.7% of the tissue accrued during weight regain, respectively. The estimate of body fat change by LTL relative to multi-compartment models (WL bias72s.d Conclusions: Weight loss and regain were associated with minimal changes in lean tissue as measured using multicompartment models. The LTL system is a useful method to measure body composition changes during clinical weight management programmes.

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“…Air displacement plethysmography BV was measured using the Bodpod body composition system (Life Measurements Instruments, CA, USA), in strict accordance with manufacturer's instructions and recommendations [15]. The subjects wore tight-fitting swimming costumes and swimming caps.…”

Section: Body Compositionmentioning

confidence: 99%

“…Essentially, BV was assessed by difference between the volume of air inside the anterior chamber of the instrument when empty and then with a subject present. Chamber air volume was measured using small pressure changes generated by an oscillating diaphragm located between the anterior and posterior chambers, using the relevant Gas Laws and taking account of ambient temperature and pressure [15]. In each test, duplicate measures of BV were performed, each lasting about 50 s. If the two measurements differed by more than 150 ml (manufacturer's determinant), a third measurement was performed.…”

Section: Body Compositionmentioning

confidence: 99%

Use of a reference four-component model to define the effects of insulin treatment on body composition in type 2 diabetes: the ?Darwin study?

et al. 2005

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Aims: To define the effects of insulin treatment on body composition and fat distribution, and investigate the potential role of body weight (BWt) gain predictors in patients with poorly controlled type 2 diabetes. , with the FFM increase due solely to total body water [TBW; +2.4 (1.5) l], as there were no detectable changes in total body protein or bone mineral, thereby increasing FFM hydration by 1.3%. More body fat was deposited centrally in patients receiving insulin alone than those receiving insulin with an oral hypoglycaemic agent (metformin). Daily insulin dose, HbA 1 c and hip circumference were independent predictors of BWt gain. Conclusions: Insulin treatment increased fat and FFM similarly in poorly controlled type 2 diabetes patients, with the FFM gain due entirely to TBW. The possible role of metformin in reducing central fat accumulation following insulin treatment warrants further investigation into its mechanism and potential long-term benefits.

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A new air displacement method for the determination of human body composition

Cited by 570 publications

References 0 publications

A Bedside Measure of Body Composition in Duchenne Muscular Dystrophy

A Bedside Measure of Body Composition in Duchenne Muscular Dystrophy

Validity of the leg-to-leg bioimpedance to estimate changes in body fat during weight loss and regain in overweight women: a comparison with multi-compartment models

Use of a reference four-component model to define the effects of insulin treatment on body composition in type 2 diabetes: the ?Darwin study?

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