▁multiple ▁frequencies ▁to ▁increase ▁the ▁accuracy ▁of ▁B IA ▁devices ▁to ▁measure ▁the ▁human ▁body ▁as ▁ 5 ▁different ▁cyl ind ers ▁( right ▁arm , ▁left ▁arm , ▁tor so , ▁right ▁leg , ▁left ▁leg ) ▁instead ▁of ▁one . ▁The ▁use ▁of ▁multiple ▁frequencies ▁would ▁also ▁distinguish ▁int rac ell ular ▁and ▁ext rac ell ular ▁water . ▁ ▁By ▁the ▁ 1 9 9 0 s , ▁the ▁market ▁included ▁several ▁multi - fre quency ▁analyz ers . ▁The ▁use ▁of ▁B IA ▁as ▁a ▁bed side ▁method ▁has ▁increased ▁because ▁the ▁equipment ▁is ▁port able ▁and ▁safe , ▁the ▁procedure ▁is ▁simple ▁and ▁non in vas ive , ▁and ▁the ▁results ▁are ▁reprodu cible ▁and ▁rapidly ▁obtained . ▁More ▁recently , ▁segment al ▁B IA ▁has ▁been ▁developed ▁to ▁overcome ▁incons isten cies ▁between ▁resistance ▁( R ) ▁and ▁body ▁mass ▁of ▁the ▁tr unk . ▁ ▁In ▁ 1 9 9 6 , ▁an ▁eight - pol ar ▁B IA ▁device ▁that ▁did ▁not ▁util ize ▁empir ical ▁equations ▁was ▁created ▁and ▁was ▁found ▁to ▁" of fer ▁accurate ▁estimates ▁of ▁T B W ▁and ▁EC W ▁in ▁women ▁without ▁the ▁need ▁of ▁population - specific ▁formulas ." ▁ ▁Me asure ment ▁configuration ▁ ▁The ▁imped ance ▁of ▁cell ular ▁t issue ▁can ▁be ▁mode led ▁as ▁a ▁res istor ▁( re present ing ▁the ▁ext rac ell ular ▁path ) ▁in ▁parallel ▁with ▁a ▁res istor ▁and ▁capac itor ▁in ▁series ▁( re present ing ▁the