The influence of wavelength and probe configuration on findings of a skin vasoconstriction test when using laser Doppler perfusion devices.

Research output: Contribution to journalArticle


The aim of this study was to establish the degree to which a standardized test based on laser Doppler blood flow measurement is dependent on the particular equipment set-up being used. For this purpose, we examined finger skin blood flow with laser Doppler instruments in 20 healthy subjects. In laser Doppler perfusion monitoring (LDPM), we used a custom-made probe with two detecting fibers placed 0.25 and 1.2 min from the illuminating fiber, respectively, and two laser Doppler perfusion imagers (LDPI) with a wavelength of 632.8 nm and 780 rim, respectively. Warming of the hand was achieved with a Peltier element, and reflex vasoconstriction was induced by immersing the other hand for 3 min into a water bath kept at 15 degrees C. As a measure for the change in skin blood flow, a vasoconstriction index (VAC: cooling/before cooling) was calculated and used for the comparison of the different devices. VAC values gathered around 0.6 for all devices. However, LDPI with a wavelength of 632.9 nm showed a slightly higher VAC index, and the difference was significant. We conclude that using a standardized test is the most appropriate for monitoring changes in blood flow rather than recording and comparing discrete values in intermittent recordings. Although a difference was noted when comparing the devices, different fiber separations and wavelengths seem then to be of little consequence. (c) 2005 Published by Elsevier Inc.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Surgery
  • Endocrinology and Diabetes


  • vasoconstriction, skin blood flow, probe configuration, waveleng-th, laser Doppler perfusion monitoring, laser Doppler perfusion imaging, sympathetic
Original languageEnglish
Pages (from-to)64-67
JournalMicrovascular Research
Issue numberJan 3
Publication statusPublished - 2006
Publication categoryResearch

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Department of Clinical Physiology (Lund) (013013000), Endocrinology (013241500), Reconstructive Surgery (013240300), Surgery Research Unit (013242220), Clinical Physiology and Nuclear Medicine Unit (013242320)