Wieling , Halliwill Karemaker , 2002 . Existing data show that astronauts experience orthostatic intolerance after space flight (Wieling , Halliwill Karemaker , 2002 . Such condition is investigated by Wieling , Halliwill and Karemaker in the hopes of finding its cause (2002 . They hypothesized that the condition is caused by a reduced function of the sympathetic system (Wieling , Halliwill Karemaker , 2002 . Through records of muscle sympathetic nerve activity and measurements of sympathetic neurotransmitter kinetics in space , they were able to determine that there was no reduced...











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