Respiratory-induced changes in finger tissue blood volume and laser Doppler flow are mainly associated with the expiratory phase of breathing.
May require accounting for expiration in finger perfusion assessments; leaves open extension to clinical cohorts.
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
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Shalom et al. (2012) studied this question.
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