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Title: Investigation of blood pulse PPG signal regulation on toe effect of body posture and lower limb height
Authors: Xin, Shang-Zhi
Hu, Sijung
Crabtree, Vincent P.
Zheng, Jia
Azorin-Peris, Vicente
Echiadis, Angelos
Smith, Peter R.
Keywords: Photoplethysmography
Non-invasive
Body posture
Blood pulse volume signal
Lower limb
Issue Date: 2007
Publisher: © Springer
Citation: XIN, S. ... et al., 2007. Investigation of blood pulse PPG signal regulation on toe effect of body posture and lower limb height. Journal of Zhejiang University, Science A, 8 (6), pp.916-920.
Abstract: Objective. To study the regulation of blood pulse volume via photoplethysmography (PPG) signal detected from toe, while the lower limb is passively raised in different height positions. Methods. Use a modified non-invasive PPG technique to detect the blood pulse signal on toe with infrared (IR) photo sensor. A protocol consisting of two postures, i.e., supine and 45° reclining, was designed to conduct laboratory trial in this study. During the period of performing the protocol of these postures, the lower limb was passively raised from the heights of 10 cm to 60 cm randomly and individually with sponge blocks underneath the foot. Results. In the supine posture, the higher the foot was passively raised, the more the blood PPG signal decreased. In the 45° reclining posture, the blood PPG signal increased at the beginning and then decreased in the foot height position from 10 cm to 60 cm. In both postures the normalized AC signal changes significantly while the normalized DC signal changes little. Conclusion. The toe PPG signals can obviously indicate the regulated blood volume change with the designated postural procedures due to the heart level position.
Description: The final publication is available at Springer via: http://dx.doi.org/10.1631/jzus.2007.A0916.
Sponsor: The authors sincerely acknowledge the kind help of University of Shanghai for Science and Technology in sponsoring the academic visitors to the UK.
Version: Published
DOI: 10.1631/jzus.2007.A0916
URI: https://dspace.lboro.ac.uk/2134/22224
Publisher Link: http://dx.doi.org/10.1631/jzus.2007.A0916
ISSN: 1673-565X
Appears in Collections:Closed Access (Mechanical, Electrical and Manufacturing Engineering)

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