Measurement of nutritional status in simulated microgravity by bioelectrical impedance spectroscopy

2003 ◽  
Vol 95 (1) ◽  
pp. 225-232 ◽  
Author(s):  
Cynthia Bartok ◽  
Richard L. Atkinson ◽  
Dale A. Schoeller
Keyword(s):  
Impedance Spectroscopy ◽  
Nutritional Status ◽  
Bioelectrical Impedance ◽  
Bed Rest ◽  
Body Water ◽  
Electrode Placement ◽  
Individual Change ◽  
Water Compartments ◽  
Total Body ◽  
Mean Differences

The potential of bioelectrical impedance spectroscopy (BIS) for assessing nutritional status in spaceflight was tested in two head-down-tilt bed-rest studies. BIS-predicted extracellular water (ECW), intracellular water (ICW), and total body water (TBW) measured using knee-elbow electrode placement were compared with deuterium and bromide dilution (DIL) volumes in healthy, 19- to 45-yr-old subjects. BIS was accurate during 44 h of head-down tilt with mean differences (BIS - DIL) of 0–0.1 kg for ECW, 0.3–0.5 for ICW, and 0.4–0.6 kg for TBW ( n = 28). At 44 h, BIS followed the within-individual change in body water compartments with a relative prediction error (standard error of the estimate/baseline volume) of 2.0–3.6% of water space. In the second study, BIS did not detect an acute decrease (-1.41 ± 0.91 kg) in ICW secondary to 48 h of a protein-free, 800 kcal/day diet ( n = 18). BIS's insensitivity to ICW losses may be because they were predominantly (65%) localized to the trunk and/or because there was a general failure of BIS to measure ICW independently of ECW and TBW. BIS may have potential for measuring nutritional status during spaceflight, but its limitations in precision and insensitivity to acute ICW changes warrant further validation studies.

Effect of skin temperature on multifrequency bioelectrical impedance analysis

1996 ◽  
Vol 81 (2) ◽  
pp. 838-845 ◽  
Author(s):  
R. Gudivaka ◽  
D. Schoeller ◽  
R. F. Kushner
Keyword(s):  
Skin Temperature ◽  
Bioelectrical Impedance ◽  
Impedance Analysis ◽  
Skin Surface ◽  
Body Water ◽  
Heating And Cooling ◽  
Water Compartments ◽  
Multifrequency Bioimpedance ◽  
Measured Impedance ◽  
Total Body

This study assessed the effects of changes in skin temperature on multifrequency bioimpedance analysis (MF-BIA) and on the prediction of body water compartments. Skin temperature (baseline 29.3 +/- 2.1 degrees C) of six healthy adults was raised over 50 min to 35.8 +/- 0.6 degrees C, followed by cooling for 20 min to 26.9 +/- 1.3 degrees C, by using an external heating and cooling blanket. MF-BIA was measured at both distal (conventional) and proximal electrode placements. Both distal and proximal impedance varied inversely with a change in skin temperature across all frequencies (5–500 kHz). The change in proximal impedance per degree centigrade change in skin surface temperature was approximately 60% of distal impedance. The change in measured impedance at 50 kHz erroneously increased predicted total body water (TBW) by 2.6 +/- 0.9 liters (P < 0.001) and underpredicted fat mass by 3.3 +/- 1.3 kg (P < 0.0001). Computer modeling of the MF-BIA data indicated changes in predicted water compartments with temperature modifications; however, the ratio of extracellular water (ECW) to TBW did not significantly change (P < 0.4). This change in impedance was not due to a change in the movement of water of the ECW compartment and thus probably represents a change in cutaneous impedance of the skin. Controlled ambient and skin temperatures should be included in the standardization of BIA measurements. The error in predicted TBW is < 1% within an ambient temperature range of 22.3 to 27.7 degrees C (72.1–81.9 degrees F).

scholarly journals Prediction of body water compartments in preterm infants by bioelectrical impedance spectroscopy

2013 ◽  
Vol 67 (S1) ◽  
pp. S47-S53 ◽  
Author(s):  
C T Collins ◽  
J Reid ◽  
M Makrides ◽  
B E Lingwood ◽  
A J McPhee ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Preterm Infants ◽  
Bioelectrical Impedance ◽  
Body Water ◽  
Water Compartments

Assessment of total body water and its compartments in elite judo athletes: comparison of bioelectrical impedance spectroscopy with dilution techniques

2014 ◽  
Vol 33 (6) ◽  
pp. 634-640 ◽  
Author(s):  
Ezequiel M. Gonçalves ◽  
Catarina N. Matias ◽  
Diana A. Santos ◽  
Luis B. Sardinha ◽  
Analiza M. Silva
Keyword(s):  
Impedance Spectroscopy ◽  
Total Body Water ◽  
Bioelectrical Impedance ◽  
Body Water ◽  
Judo Athletes ◽  
Total Body

Is bioelectrical impedance spectroscopy accurate in estimating total body water and its compartments in elite athletes?

2012 ◽  
Vol 40 (2) ◽  
pp. 152-156 ◽  
Author(s):  
Catarina N. Matias ◽  
Diana A. Santos ◽  
Ezequiel M. Gonçalves ◽  
David A. Fields ◽  
Luís B. Sardinha ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Total Body Water ◽  
Elite Athletes ◽  
Bioelectrical Impedance ◽  
Body Water ◽  
Total Body

scholarly journals Validation of Bioelectrical Impedance Spectroscopy to Measure Total Body Water in Resistance-Trained Males

2015 ◽  
Vol 25 (5) ◽  
pp. 494-503 ◽  
Author(s):  
Ava Kerr ◽  
Gary Slater ◽  
Nuala Byrne ◽  
Janet Chaseling
Keyword(s):  
Body Composition ◽  
Impedance Spectroscopy ◽  
Total Body Water ◽  
Reference Model ◽  
Reference Method ◽  
Bioelectrical Impedance ◽  
Compartment Model ◽  
Body Water ◽  
Fat Free Mass ◽  
Total Body

The three-compartment (3-C) model of physique assessment (fat mass, fat-free mass, water) incorporates total body water (TBW) whereas the two-compartment model (2-C) assumes a TBW of 73.72%. Deuterium dilution (D2O) is the reference method for measuring TBW but is expensive and time consuming. Multifrequency bioelectrical impedance spectroscopy (BIS SFB7) estimates TBW instantaneously and claims high precision. Our aim was to compare SFB7 with D2O for estimating TBW in resistance trained males (BMI >25kg/m2). We included TBWBIS estimates in a 3-C model and contrasted this and the 2-C model against the reference 3-C model using TBWD2O. TBW of 29 males (32.4 ± 8.5 years; 183.4 ± 7.2 cm; 92.5 ± 9.9 kg; 27.5 ± 2.6 kg/m2) was measured using SFB7 and D2O. Body density was measured by BODPOD, with body composition calculated using the Siri equation. TBWBIS values were consistent with TBWD2O (SEE = 2.65L; TE = 2.6L) as were %BF values from the 3-C model (BODPOD + TBWBIS) with the 3-C reference model (SEE = 2.20%; TE = 2.20%). For subjects with TBW more than 1% from the assumed 73.72% (n = 16), %BF from the 2-C model differed significantly from the reference 3-C model (Slope 0.6888; Intercept 5.093). The BIS SFB7 measured TBW accurately compared with D2O. The 2C model with an assumed TBW of 73.72% introduces error in the estimation of body composition. We recommend TBW should be measured, either via the traditional D2O method or when resources are limited, with BIS, so that body composition estimates are enhanced. The BIS can be accurately used in 3C equations to better predict TBW and BF% in resistance trained males compared with a 2C model.

Total body water and water compartments assessment in athletes: Validity of multi-frequency bioelectrical impedance

2019 ◽  
Vol 34 (6) ◽  
pp. e307-e313 ◽  
Author(s):  
C.N. Matias ◽  
F.A. Noujeimi ◽  
L.B. Sardinha ◽  
V.H. Teixeira ◽  
A.M. Silva
Keyword(s):  
Total Body Water ◽  
Bioelectrical Impedance ◽  
Body Water ◽  
Water Compartments ◽  
Total Body

Human hydrometry: comparison of multifrequency bioelectrical impedance with2H2O and bromine dilution

1998 ◽  
Vol 85 (3) ◽  
pp. 1056-1062 ◽  
Author(s):  
Kenneth J. Ellis ◽  
William W. Wong
Keyword(s):  
Impedance Spectroscopy ◽  
Traditional Method ◽  
Healthy Subjects ◽  
Bioelectrical Impedance ◽  
Extracellular Water ◽  
Males And Females ◽  
The Mean ◽  
Total Body ◽  
Mean Differences ◽  
Age Range

The traditional method of assessing total body water (TBW), extracellular water (ECW), and intracellular water (ICW) has been the use of isotopes, on the basis of the dilution principle. Although the development of bioelectrical impedance techniques has eliminated many of the measurement constraints associated with the dilution methods, the degree of interchangeability between the two methods remains uncertain. We used multifrequency bioelectrical impedance spectroscopy (BIS),2H2O dilution, and bromine dilution to assess TBW, ECW, and ICW in 469 healthy subjects (248 males, 221 females) aged 3–29 yr. We found that the TBW, ECW, and ICW estimates for the BIS and dilution methods were significantly correlated ( r 2 = 0.80–0.96, P < 0.0001, SE of the estimate = 2.3–2.7 liters). On the basis of population, the constants used in the BIS analysis could be adjusted so that the mean differences with the dilution methods would become zero. The SD values for the mean differences between the dilution and BIS methods, however, remained significant for both males and females: TBW (±2.1–2.8 liters), ECW (±1.4–1.6 liters), and ICW (2.0–3.1 liters). To improve the accuracy of the BIS measurement for an individual within the age range we have examined, further refinement of the constants used in the BIS analysis is needed.

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