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Fingertip temperature as an indicator for sympathetic responses
A Kistler1, C Mariauzouls, K von Berlepsch
1Soft Medicine Project, F. Hoffmann-La Roche Ltd., Basel, Switzerland.
Summary
Decreased fingertip temperature reliably indicates sympathetic nervous system activity affecting skin microcirculation. This simple temperature measurement can replace complex methods for assessing vasoconstriction responses.
Area of Science:
- Physiology
- Microcirculation Research
- Autonomic Nervous System Studies
Background:
- Acral skin blood flow changes are key indicators of sympathetic reflex responses.
- Understanding sympathetic-induced microcirculatory changes is crucial for physiological research.
Purpose of the Study:
- To investigate if fingertip temperature decrease reflects sympathetic-induced microcirculation changes.
- To evaluate the utility of temperature measurement versus other methods for assessing sympathetic responses.
Main Methods:
- Utilized infrared thermography to observe fingertip skin temperature.
- Employed laser Doppler flux and photoplethysmography to measure microcirculation.
- Applied various stimuli known to trigger the sympathetic nervous system.
Main Results:
- Sympathetic nervous system stimulation led to decreased cutaneous microcirculation, particularly in fingertips.
- Vasoconstriction was observed almost immediately via laser Doppler flux and photoplethysmography.
- A delayed decrease in fingertip temperature (approx. 15s lag) reflected reduced microcirculation.
- Temperature changes were most evident when initial fingertip temperature exceeded 32°C and vasoconstriction lasted over 5s.
Conclusions:
- Fingertip temperature decrease is a valid indicator of sympathetic-induced microcirculatory changes.
- Temperature measurement offers a simpler, more accessible alternative to flux and pulse volume analysis for assessing vasoconstriction.