Synchronisation of Cold Induced Vasodilation at Various Locations of One Hand (Synchronisatie van door Koude Geinduceerde Vasodilatatie op Verschillende Lokaties van een Hand).
INSTITUTE FOR PERCEPTION RVO-TNO SOESTERBERG (NETHERLANDS)
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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 PCCs 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.
- *COLD TOLERANCE
- *BODY TEMPERATURE
- NERVE CELLS
- HEAT FLUX
- TEMPERATURE MEASURING INSTRUMENTS
- Stress Physiology
- Anatomy and Physiology