Bioelectrical impedance method

Several methods are available to evaluate a patient s actual body composition rather than total body mass. Skin-fold measurement may be of value in evaluating subcutaneous adiposity (adipose tissue accumulation) proper technique is required for reliable results. Other anthropomorphic measurements such as bioelectrical impedance, dual-energy x-ray absorptiometry, and total body water immersion are also available.These last techniques are often of value in research studies, but it is clinically impractical to use them routinely (Elberg et al., 2004). 

In addition to MLP based classifier the presented approach should be validated with other advanced classification techniques such as Support Vector Machine (SVM). The robustness should be further examined with more statistics and with data from real driving scenarios. Inspired by study in [15] driving impairment such as inebriation should be investigated by utilizing bioelectrical impedance with tetrapolar electrode method. Correlation study of bioelectrical impedance and human emotional state can be carried out thereafter. 

Measurements of either total body electrical conductivity (TOBEC) or bioelectrical impedance (BIE) are used mainly in research, but as the equipment becomes more widely available these methods will become the methods of preference for routine estimation of body fat. 

Bioelectrical Impedance Data In order to reduce the random fluctuation in data acquisition, three experimental current responses associated to the BIS-STEP method was obtained tluough the average of 50 voltage steps. Figure 1 depicts a typical current response. 

Fig. 2. Electric model used by the method BIS-STEP to interpret current response i to a step voltage of magnitude Vd. The extracellular resistance - Re, intracellular resistance - Ri, and membrane capacitance -Cm, stand for the biological segmental bioelectric impedance model. The capacitances - Ce and resistances - Rb are associated to the impedances of the two electrode-tissue interfaces.

Subject s characteristics are shown in Table 1. Table 2 shows the results of the comparison of TBW by deuterium oxide dilution (D2O) against TBW by anthropometry (ANT) and TBW by bioelectrical impedance analysis (BIA) by three complementary methods. 

Gonzalez-Correa CH, Caicedo-Eraso JC (2012). Bioelectrical impedance analysis (BIA) a proposal for standardization of the classical method in adults. JPhys Conf 5fer 407 012018. 

Bioelectrical impedance analysis is a safe, non- invasive and objective method to assess architecture and function at tissue level [11]. Current applied to muscle travels either longitudinally or transversally, impedance being lower when it flows parallel to muscle fibres. Localized BIA it s a... 

V. Lvovich, S. Srikanthan, R. L. Silverstein, A novel broadband impedance method for detection of cell-derived microparticles, Biosens. Bioelectr., 2010,26, pp. 444-451. 

Lukaski H, Johnson E, Bolonchuk W et al (1985) Assessment impedance of fat-fi ee mass using bioelectrical measurements of the human body. Am 1 Clin Nutr 41 810-7 Fleiss 1 (1986) The design and analysis of clinical experiments. Wiley, New York DOI 10.1016/0898-1221(87)90245-8 Bland J, Altman D (1986) Statistical methods for assessing agreement between two methods of clinical measurement Lancet 1 307-10... 

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