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On the Modeling of Electrical Effects Experienced by Space Explorers During Extra Vehicular Activities: Intracorporal Currents, Resistances, and Electric FieldsRecent research has shown that space explorers engaged in Extra Vehicular Activities (EVAs) may be exposed, under certain conditions, to undesired electrical currents. This work focuses on determining whether these undesired induced electrical currents could be responsible for involuntary neuromuscular activity in the subjects, possibly caused by either large diameter peripheral nerve activation or reflex activity from cutaneous afferent stimulation. An efficient multiresolution variant of the admittance method along with a millimeter-resolution model of a male human body were used to calculate induced electric fields, resistance between contact electrodes used to simulate the potential exposure condition, and currents induced in the human body model. Results show that, under realistic exposure conditions using a 15V source, current density magnitudes and total current injected are well above previously reported startle reaction thresholds. This indicates that, under the considered conditions, the subjects could experience involuntary motor response.
Document ID
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Cela, Carlos J.
(Utah Univ. Salt Lake City, UT, United States)
Loizos, Kyle
(Utah Univ. Salt Lake City, UT, United States)
Lazzi, Gianluca
(Utah Univ. Salt Lake City, UT, United States)
Hamilton, Douglas
(NASA Johnson Space Center Houston, TX, United States)
Lee, Raphael C.
(Chicago Univ. Chicago, IL, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2011
Subject Category
Man/System Technology And Life Support
Report/Patent Number
Distribution Limits
Public Use Permitted.
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