Percent Error Bioelectrical Impedance
Health Search databasePMCAll DatabasesAssemblyBioProjectBioSampleBioSystemsBooksClinVarCloneConserved DomainsdbGaPdbVarESTGeneGenomeGEO DataSetsGEO ProfilesGSSGTRHomoloGeneMedGenMeSHNCBI Web SiteNLM CatalogNucleotideOMIMPMCPopSetProbeProteinProtein ClustersPubChem BioAssayPubChem CompoundPubChem SubstancePubMedPubMed HealthSNPSparcleSRAStructureTaxonomyToolKitToolKitAllToolKitBookToolKitBookghUniGeneSearch termSearch Advanced Journal list Help Journal ListNutr Jv.7; 2008PMC2543039 Nutr J. 2008; 7: 26. Published online 2008 Sep 9. doi: 10.1186/1475-2891-7-26PMCID: PMC2543039Is bioelectrical impedance accurate for use in large epidemiological studies?Mahshid Dehghan1,2 and Anwar T Merchant31Population Health Research Institute, McMaster University, Hamilton, ON, Canada2Department of Medicine, McMaster University, Hamilton, ON, Canada3Department of Clinical Epidemiology and Biostatistics, and Population Health Research Institute, McMaster University, Hamilton, ON, CanadaCorresponding author.Mahshid Dehghan: ac.retsamcm.ccc@dihsham; Anwar T Merchant: moc.oohay@tnahcrem_rawna Author information ► Article notes ► Copyright and License information ►Received 2007 Oct 19; Accepted 2008 Sep 9.Copyright © 2008 Dehghan and Merchant; licensee BioMed Central Ltd.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.This article has been cited by other articles in PMC.AbstractPercentage of body fat is strongly associated with the risk of several chronic diseases but its accurate measurement is difficult. Bioelectrical impedance analysis (BIA) is a relatively simple, quick and non-invasive technique, to measure body composition. It measures body fat accurately in controlled clinical conditions but its performance in the field is inconsistent. In large epidemiologic studies simpler surrogate techniques such as body mass index (BMI), waist circumference, and waist-hip ratio are frequently used instead of BIA to measure body fatness. We reviewed the rationale, theory, and technique of recently devel
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been thinking about getting a set of body fat scales,” he wrote. “It tells you your weight, total body water, body http://muscleevo.net/body-fat-scales/ fat levels and a ton of other information. Are body fat scales accurate?” Body fat scales use a method known as bioelectrical impedance (BIA) to estimate your body composition. They run a light electrical current through your body, measure the degree of resistance (or impedance) to the flow of the current, then use this information to estimate how much body fat you have [2]. percent error Body fat scales are one of the most popular ways to measure body composition, mainly because they're quick and easy to use. Some devices even connect to your computer and provide numerous graphs, charts and diagrams. But while it might look very scientific and official, much of this information is completely useless. The argument in favor of body fat testing is that even if percent error bioelectrical a given test isn't accurate, at least it's consistent. In other words, it doesn't matter if a body fat test is "out" by a few percentage points here or there. As long as it's consistently inaccurate, you can use it to track your progress over time. The problem with this idea is that a change in weight causes a shift in the density of various tissues. Different types of training also have different effects on the density and composition of fat-free mass [3]. But BIA wrongly assumes that the density of various tissues is the same from person to person, and remains constant over time as you lose weight. To put it another way, the degree to which a body fat test is "out" by will change over time. Not only is it inaccurate, it's inconsistently inaccurate. Many BIA devices miss out large segments of your body. Stand on a set of foot-to-foot body fat scales, for example, and the current will simply go up one leg and down the other [4]. So you’re really only measuring how fat your legs are. Changes in hydration status will also have a