Accession Number : ADA256489

Title :   Synchronisation of Cold Induced Vasodilation at Various Locations of One Hand (Synchronisatie van door Koude Geinduceerde Vasodilatatie op Verschillende Lokaties van een Hand).

Descriptive Note : Final rept.,

Corporate Author : INSTITUTE FOR PERCEPTION RVO-TNO SOESTERBERG (NETHERLANDS)

Personal Author(s) : Daanen, H. A. ; Lotens, W. A.

Report Date : 06 JUL 1992

Pagination or Media Count : 23

Abstract : The mechanism responsible for cold induced vasodilation (CIVD) is still subject to debate. Several theories are based on Local mechanism as the release of a dilating substance, an axon reflex or Local paralysis of smooth muscles in the vessel wall. However, it is also shown that core temperature has to play a major role, because CIVD decreases in magnitude when the core gets colder. In this investigation the amount of correspondence between the CIVD-responses on several sites of the Left hand is quantified by the Pearson correlation coefficient (PCC) of the local skin temperatures. A PCC of zero means that all registrations are independent, indicating a purely local mechanism. A PCC approaching 1 indicates an increasing central component. Therefore, twelve subjects immersed their left hands in a calorimeter water bath of 5 deg C. ALL PCC's were calculated of the fingers and the ventral and dorsal side of the hand. A period of 30 minutes was analyzed, starting 10 minutes after immersion. The PCC was higher for neighbouring fingers (PCC = 0.67) than for fingers separated by other fingers (PCC 0.48). For neighbouring fingers those mainly innervated by the same somatic nerve (ring-little and index-middle finger) had a higher PCC (PCC = 0.80) than for the fingers with more separate innervation (PCC 0.55). Circulation, Cold induced Vasodilation, Innervation.

Descriptors :   *VASODILATION, *COLD TOLERANCE, *BODY TEMPERATURE, BATHS, CALORIMETERS, CIRCULATION, COEFFICIENTS, CORES, CORRELATION, FINGERS, HANDS, IMMERSION, INDEXES, MUSCLES, NERVE CELLS, NERVES, PARALYSIS, RECREATION, REFLEXES, RELEASE, RESPONSE, RINGS, SITES, STARTING, TEMPERATURE, WALLS, WATER, SKIN(ANATOMY), HEAT FLUX, TEMPERATURE MEASURING INSTRUMENTS, NETHERLANDS, TRANSLATIONS.

Subject Categories : Stress Physiology
      Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE