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Keywords:

  • inspiration;
  • expiration;
  • light absorption;
  • sympathetic nervous system;
  • microcirculation;
  • laser Doppler flowmetry

Abstract

Changes in finger tissue blood volume (TBV) measured by light transmission and in laser Doppler flow (LDF) were obtained during long breathing (of 12 s period) and associated with the respiratory phases, inspiration and expiration. For fifteen out of sixteen subjects TBV and LDF started to decrease 0–2 s after the start of expiration and increased during inspiration but the start of increase occurred before the start of inspiration, showing that the respiratory-induced changes in TBV and LDF are mainly associated with the expiration. Decrease of TBV and LDF after expiration was also found during the inspiratory gasps (© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)