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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/22207

Title: Effect of postural changes on lower limb blood volume, detected with non-invasive photoplethysmography
Authors: Zheng, Jia
Hu, Sijung
Xin, Shang-Zhi
Crabtree, Vincent P.
Keywords: Photoplethysmography
Postural changes
Lower limb
Peripheral perfusion
Tissue optics model
Issue Date: 2008
Publisher: © Informa UK
Citation: ZHENG, J. ... et al., 2008. Effect of postural changes on lower limb blood volume, detected with non-invasive photoplethysmography. Journal of Medical Engineering and Technology, 32 (5), pp.358-364.
Abstract: This paper describes the effect of passive leg raising on blood volume change in the lower limb, using a dual probe photoplethysmography (PPG) system employing a tissue optics model. The normalized AC/DC ratio and DC value are introduced from the model to evaluate the dynamic pulsation and total blood volume changes due to postural effects. The AC and DC components of PPG signals were collected from a passive leg raising protocol. With the leg raised, the normalized AC/DC ratio significantly decreased when supine, while the normalized DC value increased significantly in both supine and reclining positions. The parameters from the stationary leg showed similar but smaller responses. These results demonstrate a local and systemic physiological phenomenon in the lower limb blood volume change caused by postural changes. The normalized AC/DC ratio and DC value derived from the tissue optics model could be applied to assess the blood volume change.
Description: Closed access.
Sponsor: [The] authors would like to acknowledge Loughborough University for the financial support [and] the University of Shanghai for Science and Technology (USST) for sponsoring an academic visitor to participate in the experiments.
Version: Published
DOI: 10.1080/03091900701453990
URI: https://dspace.lboro.ac.uk/2134/22207
Publisher Link: http://dx.doi.org/10.1080/03091900701453990
ISSN: 0309-1902
Appears in Collections:Closed Access (Mechanical, Electrical and Manufacturing Engineering)

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