 postur chang blood distribut relat chang cardiac output 1 cardiac output blood content indic part bodi measur 18 subject includ patient diseas extern radioisotop count techniqu chang 2 paramet induc stand compar 2 averag chang blood distribut produc stand decreas blood content lung -25 heart -26 increas thigh +56 statist signific chang reveal head palm liver abdomen 3 cardiac output stroke volum decreas stand case data report treat statist averag decreas cardiac output -13 6 control case -35 16 case neurocirculatori asthenia -35 10 case hyperthyroid differ control neurocirculatori asthenia stand induc substanti increas cardiac output case idiopath nodal rhythm remain doubt ordinari respons diseas 4 linear correl reveal cent chang blood content thigh lung cardiac output stroke volum induc stand minim blood shift observ extrem vice versa impli reactiv heart influenc postur transmur pressur vein capillari adjust arteriol compens chang cardiac output 