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  • Title: Noninvasive approach for study of human reaction and transferring velocity of nervous system by using a new instrumentation devised for concurrent microscopic observation and analysis of sweat secretion on human body under 1G and microgravity.
    Author: Tsuda T, Kitagawa S, Nagaoka S.
    Journal: J Gravit Physiol; 2000 Jul; 7(2):P129-30. PubMed ID: 12697499.
    Abstract:
    Human sweating is generally caused by thermal and mental stimuli. The former role is well known as a response for thermo regulation. The insensible perspiration may be generally controlled by the autonomic nervous system, and the responses due to mental and/or emotional stress by the sympathetic nervous system. As human sweating is directly concerned with some nervous systems, sweating may be a good indicator for the body reactions of feeling, surprise, emotional stress and etc. The measuring of sweat secretion and microscopic observation of active sweat glands can be presented the direct information of working of sympathetic nervous system and sudomotor. In the present report, we devised an instrumentation for the estimation of time lag of sweating [correction of seating] after physical stimuli. Variation of gravity during parabolic flights is a kind of physical stimulus. Iwase et al reported the changes of sympathetic outflow to muscle in humans during short periods of microgravity. We studied also the variation of number of active sweat glands under this condition for the evaluation of human sympathetic nervous system.
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