An Easy And Accurate Way To Measure Your Body Composition ~ BuzzFeed Blog

Bioelectrical impedance analysis (BIA) is a widely used method for estimating body composition. The technology is relatively simple, quick, and Despite a general public perception that BIA measures "body fat," the technology actually determines the electrical impedance of body tissues, which...Known as: Biolectric Impedance, Impedance, Bioelectrical, Impedance, Biolectric. National Institutes of Health. Objective: To compare body composition determined by bioelectrical impedance (BIA) consumer devices against criterion estimates…Bioelectrical impedance analysis (BIA), also called bioelectrical impedance (BEI), is a commonly used technique for estimating body composition. Based on a two-compartment body composition model (fat mass and FFM), BIA determines the resistance (impedance)...Keywords: body composition, bioelectrical impedance, resistance, reactance, fat mass, fat-free mass, body water Cite This Article: Mirele Savegnago Based on the principles of BIA, which mainly works by measuring body resistance and reactance in order to alternate an electric current, the...In order to make QBioscan the optimal medical Body Composition Analyzer for working Health risk To determine a patient's prognosis for general health, the Health risk module and its phase In the 1980's the term bioelectrical impedance analysis was finally established as the name for the method.

Bioelectrical Impedance | Semantic Scholar

If we determine the impedance across the voltage source terminals, it should be Zg, and it is possible only if the For the two sources to be equivalent, their impedances across their terminals must be equal. A good composition should have an introduction (one paragraph), a body (depends on...Body weight, body density, and bioelectrical impedance were measured before and after weight Therefore, any method useful for measuring body composition must also be able to (Received A study was conducted to investigate the validity of bioelectrical impedance measurement (BIM) for...Objective: To determine the relative validity of specific bioelectrical impedance analysis (BIA) prediction equations and BMI as predictors of physiologically relevant general adiposity. Percent body fat estimated from BIA was minimally predictive of the physiological markers independent of BMI.Body fat scales use the Bioelectrical Impedance Analysis (BIA) technique. This method measures body composition by sending a low, safe electrical current through the body. The current passes freely through the fluids in muscle tissue but encounters difficulty/resistance when it passes through...

Bioelectrical Impedance Analysis - an overview | ScienceDirect Topics

Body composition calculated using whole-body bioelectrical impedance analysis (BIA), almost invariably with height (H) and often In order to make judgements about the relative merits of bedside body composition techniques, it is necessary to use a reference method, such as densitometry...how it works: Bioelectrical impedance measures the resistance of body tissues to the flow of a small, harmless electrical signal. body weight scales. advantages: this method of body composition analysis is very simple and quick to perform, and if you have the right equipment can be done at home.Bioelectrical Impedance Analysis (BIA) determines body composition by running small electrical currents through the body. As the electrical conductivity is different between various bodily tissues (e.g. muscle, fat, bone, etc.) due to their variation in water content, the small electrical current passes......Body Composition With Bioelectrical Impedance, You Must Also Know _. Body Composition With Bioelectrical Impedance, You Must Also Know _. A. height, weight, gender, and percentage of body fat B. age, gender, and lean muscle mass C. height, age, weight...Chapter 08 Assessing Body Composition Classification and Use of Body Composition Measures You must closely follow standardized testing procedures. • You must practice in order to perfect Figure 8.9 Bioelectrical Impedance Method • BIA is rapid, noninvasive, and relatively inexpensive. •

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Bioelectrical impedance analysis (BIA) is a frequently used method for estimating body composition, in specific body fat and muscular tissues. In BIA, a vulnerable electric present flows throughout the body and the voltage is measured in order to calculate impedance (resistance) of the body. Most body water is stored in muscle. Therefore, if a person is extra muscular there's a prime chance that the person will also have extra body water, which leads to lower impedance. Since the advent of the primary commercially available units in the mid-Nineteen Eighties the method has become fashionable owing to its ease of use and portability of the equipment. It is acquainted in the patron market as a simple tool for estimating body fats. BIA[1] in truth determines the electrical impedance, or opposition to the flow of an electric present thru body tissues which will then be used to estimate total body water (TBW), which can be utilized to estimate fat-free body mass and, via distinction with body weight, body fat.

Accuracy

Many of the early analysis research showed that BIA was once quite variable and it was once no longer appeared by way of many as offering an accurate measure of body composition. In recent years technological enhancements have made BIA slightly more reliable and therefore more appropriate method of measuring body composition. Nevertheless, it is DEXA and MRI - and no longer BIA - which might be thought to be the reference means in body composition research.[2]

Although the instruments are simple to use, cautious consideration to the process of use (as described by way of the producer) must be given.

Simple devices to estimate body fats, steadily the usage of BIA, are available to consumers as body fat meters. These instruments are normally considered being less correct than the ones used clinically or in nutritional and scientific practice. They have a tendency to under-read body fat percentage.[3]

Dehydration is a identified factor affecting BIA measurements as it reasons an build up in the body's electric resistance, so has been measured to cause a 5 kg underestimation of fat-free mass i.e. an overestimation of body fat.[4]

Body fat measurements are decrease when measurements are taken shortly after intake of a meal, causing a variation between very best and lowest readings of body fat share taken during the day of up to 4.2% of body fats.[5]

Moderate exercise sooner than BIA measurements lead to an overestimation of fat-free mass and an understatement of body fat share due to decreased impedance.[6] For instance, average intensity workout for 90–a hundred and twenty minutes sooner than BIA measurements reasons just about a 12 kg overestimation of fat-free mass, i.e. body fat is significantly underestimated.[7] Therefore, it is suggested no longer to carry out BIA for several hours after reasonable or top depth exercise.[8]

BIA is considered reasonably correct for measuring groups, of limited accuracy for tracking body composition in an individual over a time frame, however isn't thought to be sufficiently actual for recording of single measurements of individuals.[9][10]

Consumer grade gadgets for measuring BIA have not been found to be sufficiently correct for unmarried size use, and are better suited to be used to measure adjustments in body composition over the years for people.[11] Two-electrode foot-to-foot dimension is less accurate than 4-electrode (ft, palms) and eight-electrode dimension. Results for some four- and eight-electrode tools examined found poor limits of settlement and in some cases systematic bias in estimation of visceral fats proportion, however excellent accuracy in the prediction of resting energy expenditure (REE) when put next with more accurate whole-body magnetic resonance imaging (MRI) and dual-energy X-ray absorptiometry (DEXA).[12]

The use of more than one frequencies in explicit BIA devices that utilize 8 electrodes has been found to have a 94% correlation way with DEXA when measuring body fat share. The correlation with DEXA is as top as 99% when measuring Lean Mass, if strict pointers are adhered to.[13][14]

Historical background

Electrical homes of tissues have been described since 1872. These homes had been further described for a much wider range of frequencies on a larger vary of tissues, together with those that have been broken or present process exchange after loss of life.

In 1962, Thomasset performed the original research the usage of electrical impedance measurements as an index of general body water (TBW), using two subcutaneously inserted needles.[15]

In 1969, Hoffer concluded that an entire body impedance dimension may are expecting overall body water. The equation (the squared price of height divided by means of impedance measurements of the precise part of the body) showed a correlation coefficient of 0.92 with total body water. This equation, Hoffer proved, is referred to as the impedance index used in BIA.[16]

In 1983, Nyober validated using complete body electrical impedance to assess body composition.[17]

By the Nineteen Seventies the rules of BIA had been established, together with those who underpinned the relationships between the impedance and the body water content of the body. A variety of unmarried frequency BIA analyzers then changed into commercially available, akin to RJL Systems and its first commercialized impedance meter.

In the 1980, Lukaski, Segal, and other researchers found out that the use of a unmarried frequency (50 kHz) in BIA assumed the human body to be a single cylinder, which created many technical limitations in BIA. The use of a unmarried frequency was once erroneous for populations that didn't have the standard body kind. To reinforce the accuracy of BIA, researchers created empirical equations the use of empirical information (gender, age, ethnicity) to are expecting a person's body composition.

In 1986, Lukaski printed empirical equations using the impedance index, body weight, and reactance.[18]

In 1986, Kushner and Scholler published empirical equations the use of the impedance index, body weight, and gender.[19]

However, empirical equations were only helpful in predicting the common population's body composition and was once erroneous for clinical functions for populations with sicknesses.[20] In 1992, Kushner proposed the use of multiple frequencies to building up the accuracy of BIA units to measure the human body as 5 other cylinders (correct arm, left arm, torso, appropriate leg, left leg) instead of one. The use of more than one frequencies would also distinguish intracellular and extracellular water.[21]

By the 1990s, the marketplace incorporated a number of multi-frequency analyzers. The use of BIA as a bedside method has greater for the reason that apparatus is moveable and safe, the procedure is modest and noninvasive, and the effects are reproducible and swiftly bought. More recently, segmental BIA has been evolved to overcome inconsistencies between resistance (R) and body mass of the trunk.

In 1996, an eight-polar BIA device that did not make the most of empirical equations used to be created and was found to "offer accurate estimates of TBW and ECW in women without the need of population-specific formulas."[22]

Measurement configuration

The impedance of mobile tissue will also be modeled as a resistor (representing the extracellular path) in parallel with a resistor and capacitor in collection (representing the intracellular trail). This effects in a transformation in impedance versus the frequency used in the dimension. The impedance size is most often measured from the wrist to the contralateral ankle and uses both two or four electrodes. A small current on the order of 1-10 μA is handed between two electrodes, and the voltage is measured between the similar (for a two electrode configuration) or between the other two electrodes.[23]

Phase attitude

In bioelectrical impedance research in humans, an estimate of the phase angle will also be acquired and is in accordance with adjustments in resistance and reactance as alternating current passes through tissues, which reasons a section shift. The measured section angle therefore is determined by several biological factors. Phase attitude is larger in males than girls, and reduces with increasing age.[24]

References

^ .mw-parser-output cite.quotationfont-style:inherit.mw-parser-output .quotation qquotes:"\"""\"""'""'".mw-parser-output .id-lock-free a,.mw-parser-output .quotation .cs1-lock-free abackground:linear-gradient(clear,transparent),url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em middle/9px no-repeat.mw-parser-output .id-lock-limited a,.mw-parser-output .id-lock-registration a,.mw-parser-output .quotation .cs1-lock-limited a,.mw-parser-output .quotation .cs1-lock-registration abackground:linear-gradient(transparent,transparent),url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")correct 0.1em center/9px no-repeat.mw-parser-output .id-lock-subscription a,.mw-parser-output .citation .cs1-lock-subscription abackground:linear-gradient(clear,transparent),url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")appropriate 0.1em middle/9px no-repeat.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registrationcolour:#555.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration spanborder-bottom:1px dotted;cursor:lend a hand.mw-parser-output .cs1-ws-icon abackground:linear-gradient(transparent,transparent),url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")appropriate 0.1em center/12px no-repeat.mw-parser-output code.cs1-codecolour:inherit;background:inherit;border:none;padding:inherit.mw-parser-output .cs1-hidden-errordisplay:none;font-size:100%.mw-parser-output .cs1-visible-errorfont-size:100%.mw-parser-output .cs1-maintshow:none;colour:#33aa33;margin-left:0.3em.mw-parser-output .cs1-formatfont-size:95%.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-leftpadding-left:0.2em.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-rightpadding-right:0.2em.mw-parser-output .citation .mw-selflinkfont-weight:inheritKyle UG, Bosaeus I, De Lorenzo AD, Deurenberg P, Elia M, Gómez JM, Heitmann BL, Kent-Smith L, Melchior JC, Pirlich M, Scharfetter H, Schols AM, Pichard C (October 2004). "Bioelectrical impedance analysis--part I: review of principles and methods". Clinical Nutrition. 23 (5): 1226–43. doi:10.1016/j.clnu.2004.06.004. PMID 15380917. ^ "Advanced body composition assessment: from body mass index to body composition profiling". 2018. Retrieved 14 February 2020. ^ "Body fat scales review and compare". 10 January 2010. Retrieved 11 January 2010. ^ Lukaski HC, Bolonchuk WW, Hall CB, Siders WA (April 1986). "Validation of tetrapolar bioelectrical impedance method to assess human body composition". Journal of Applied Physiology. 60 (4): 1327–32. doi:10.1152/jappl.1986.60.4.1327. PMID 3700310. S2CID 44184800. ^ Slinde F, Rossander-Hulthén L (October 2001). "Bioelectrical impedance: effect of 3 identical meals on diurnal impedance variation and calculation of body composition". The American Journal of Clinical Nutrition. 74 (4): 474–8. doi:10.1093/ajcn/74.4.474. PMID 11566645. proportion of body fat various by 8.8% from the very best to the lowest size in girls and by means of 9.9% from the very best to the bottom measurement in males, The matter with the largest lower in share of body fats had a lower of 23%, from 17.9% body fats at baseline to 13.7% body fats at measurement no. 17. ^ Kushner RF, Gudivaka R, Schoeller DA (September 1996). "Clinical characteristics influencing bioelectrical impedance analysis measurements". The American Journal of Clinical Nutrition. 64 (3 Suppl): 423S–427S. doi:10.1093/ajcn/64.3.423S. PMID 8780358. ^ Abu Khaled M, McCutcheon MJ, Reddy S, Pearman PL, Hunter GR, Weinsier RL (May 1988). "Electrical impedance in assessing human body composition: the BIA method". The American Journal of Clinical Nutrition. 47 (5): 789–92. doi:10.1093/ajcn/47.5.789. PMID 3364394. ^ Dehghan M, Merchant AT (September 2008). "Is bioelectrical impedance accurate for use in large epidemiological studies?". Nutrition Journal. 7: 26. doi:10.1186/1475-2891-7-26. PMC 2543039. PMID 18778488. ^ Buchholz AC, Bartok C, Schoeller DA (October 2004). "The validity of bioelectrical impedance models in clinical populations". Nutrition in Clinical Practice. 19 (5): 433–46. doi:10.1177/0115426504019005433. PMID 16215137. In basic, bioelectrical impedance technology could also be acceptable for determining body composition of groups and for monitoring changes in body composition inside people through the years. Use of the era to make unmarried measurements in individual sufferers, on the other hand, is not really useful. ^ Fosbøl, Marie Ø; Zerahn, Bo (2015). "Contemporary methods of body composition measurement". Clinical Physiology and Functional Imaging. 35 (2): 81–97. doi:10.1111/cpf.12152. ISSN 1475-097X. PMID 24735332. ^ Peterson JT, Repovich WE, Parascand CR (2011). "Accuracy of Consumer Grade Bioelectrical Impedance Analysis Devices Compared to Air Displacement Plethysmography". Int J Exerc Sci. 4 (3): 176–184. ^ Bosy-Westphal A, Later W, Hitze B, Sato T, Kossel E, Gluer CC, Heller M, Muller MJ (2008). "Accuracy of bioelectrical impedance consumer devices for measurement of body composition in comparison to whole body magnetic resonance imaging and dual X-ray absorptiometry". Obesity Facts. 1 (6): 319–24. doi:10.1159/000176061. PMC 6452160. PMID 20054195. One of the 8 authors of this study is employed by way of body composition monitor manufacturer Omron, who financed the learn about. ^ Miller, Ryan M.; Chambers, Tony L.; Burns, Stephen P. (October 2016). "Validating InBody 570 Multi-frequency Bioelectrical Impedance Analyzer versus DXA for Body Fat Percentage Analysis" (PDF). Journal of Exercise Physiology Online. 19: 71–78. ISSN 1097-9751. ^ Ling, Carolina H.Y.; de Craen, Anton J.M.; Slagboom, Pieternella E.; Gunn, Dave A.; Stokkel, Marcel P.M.; Westendorp, Rudi G.J.; Maier, Andrea B. (October 2011). "Accuracy of direct segmental multi-frequency bioimpedance analysis in the assessment of total body and segmental body composition in middle-aged adult population". Clinical Nutrition. 30 (5): 610–615. doi:10.1016/j.clnu.2011.04.001. PMID 21555168. ^ Thomasset, MA (15 July 1962). "Proprietes bioelectrique des tissuş, Mesures de l'impedance en clinique" [Bioelectric homes of tissue. Impedance measurement in clinical drugs. Significance of curves received]. Lyon Medical (in French). 94: 107–18. PMID 13920843. ^ Hoffer, E C; Meador, C Okay; Simpson, D C (October 1969). "Correlation of whole-body impedance with total body water volume". Journal of Applied Physiology. 27 (4): 531–4. doi:10.1152/jappl.1969.27.4.531. PMID 4898406. ^ Nyboer, J.; Liedtke, R.J.; Reid, Ok.A.; Gessert, W.A. (1983). Nontraumatic electric detection of total body water and density in guy. Proceeding of the sixth International Conference of Electrical Bioimpedance. pp. 381–4. ^ Lukaski HC, Bolonchuk WW, Hall CB, Siders WA (April 1986). "Validation of tetrapolar bioelectrical impedance method to assess human body composition". Journal of Applied Physiology. 60 (4): 1327–32. doi:10.1152/jappl.1986.60.4.1327. PMID 3700310. S2CID 44184800. ^ Kushner RF, Schoeller DA (September 1986). "Estimation of total body water by bioelectrical impedance analysis". The American Journal of Clinical Nutrition. 44 (3): 417–24. doi:10.1093/ajcn/44.3.417. PMID 3529918. ^ Dehghan M, Merchant AT (September 2008). "Is bioelectrical impedance accurate for use in large epidemiological studies?". Nutrition Journal. 7: 26. doi:10.1186/1475-2891-7-26. PMC 2543039. PMID 18778488. ^ Kushner RF (April 1992). "Bioelectrical impedance analysis: a review of principles and applications". Journal of the American College of Nutrition. 11 (2): 199–209. PMID 1578098. ^ Sartorio A, Malavolti M, Agosti F, Marinone PG, Caiti O, Battistini N, Bedogni G (February 2005). "Body water distribution in severe obesity and its assessment from eight-polar bioelectrical impedance analysis" (PDF). European Journal of Clinical Nutrition. 59 (2): 155–60. doi:10.1038/sj.ejcn.1602049. PMID 15340370. ^ Foster, Ok R; Lukaski, H C (September 1996). "Whole-body impedance--what does it measure?". The American Journal of Clinical Nutrition. 64 (3): 388S–396S. doi:10.1093/ajcn/64.3.388S. PMID 8780354. ^ Barbosa-Silva, MC; et al. (2005). "Bioelectrical impedance analysis: population reference values for phase angle by age and sex". American Journal of Clinical Nutrition. 82 (1): 49–52. doi:10.1093/ajcn.82.1.49. PMID 16002799. Retrieved 3 April 2016.

Further studying

Tsao C, Lin K, Lai J, Lan C (September 1995). "Reliability of body fat measurement: Skinfold, bioelectrical impedance analysis and infrared". Journal of the Physical Therapy Association of the Republic of China: 102–8. Máttar JA (November 1996). "Application of total body bioimpedance to the critically ill patient. Brazilian Group for Bioimpedance Study". New Horizons. 4 (4): 493–503. PMID 8968982. Heber D, Ingles S, Ashley JM, Maxwell MH, Lyons RF, Elashoff RM (September 1996). "Clinical detection of sarcopenic obesity by bioelectrical impedance analysis". The American Journal of Clinical Nutrition. 64 (3 Suppl): 472S–477S. doi:10.1093/ajcn/64.3.472S. PMID 8780366. Dehghan M, Merchant AT (September 2008). "Is bioelectrical impedance accurate for use in large epidemiological studies?". Nutrition Journal. 7: 26. doi:10.1186/1475-2891-7-26. PMC 2543039. PMID 18778488.

External hyperlinks

The International Society for Electrical Bioimpedance Bioimpedance Analysis Electronic Media Review Retrieved from "https://en.wikipedia.org/w/index.php?title=Bioelectrical_impedance_analysis&oldid=996260838"