Three main groups of FX deficiency can be identi-fied:[9'10] the cross-reacting material (CRM)-negative group in which both antigen and activity are similarly decreased (''hypo'' or type I), while prothrombin time, activated partial thromboplastin time, as well as Russell viper venom time-based assays are prolonged; the CRMpositive group which has normal or near normal antigen levels but factor X activity is decreased (''dys'' or type II); thirdly, the CRM-reduced group in which both activity and antigen levels are reduced but antigen is markedly higher than activity (''hypo-dys'').
Clinical manifestations of FX deficiency are highly variable and usually only develop in homozygotes or double heterozygotes. Factor X levels between 10% and 40% of normal are considered sufficient to prevent
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.