Browse by author
Lookup NU author(s): Dr Luigi Di Marco, Dr Ding Chang Zheng, Emeritus Professor Alan MurrayORCiD
Full text for this publication is not currently held within this repository. Alternative links are provided below where available.
The aim of this study was to investigate the effects of deep breathing on blood pressure parameters: systolic (SBP), diastolic (DBP) and pulse pressure, mean pulse rate (MPR), and the amplitude of Korotkoff sounds.Manual SBP and DBP were measured from 20 healthy subjects (age: 44 +/- 13 years) during normal (NB) and deep (DB) breathing. A chest magnetometer was used to acquire the respiratory depth, and an electronic stethoscope for the Korotkoff sound. All data were sampled at 2 kHz. MPR was derived from the oscillometric pulse waveform. For each oscillometric pulse, time-frequency analysis of the Korotkoff sound located the time of the peak energy (Tp), and Korotkoff sounds amplitude was defined as the maximum peak-to-peak amplitude in the window T-P +/- 50ms. The respiratory rate was calculated from both the magnetometer (f(R)) and Korotkoff amplitude series (f(K)) for the period between the manually measured SBP and DBP, with a power spectral density resolution of 0.016 Hz in the physiological respiratory frequency range at rest.DB compared to NB increased respiratory regularity (quantified by spectral concentration) by 9 +/- 10% (mean +/- SD, p<0.005), and decreased fR from 0.24 +/- 0.06 to 0.20 +/- 0.05 Hz (p<0.0005). SBP and pulse pressure also decreased, from 116 +/- 12 to 113 +/- 11 mmHg (p<0.005) and 41 +/- 9 to 37 +/- 9 mmHg (p<0.01) respectively, and MPR increased from 64 +/- 8 to 68 +/- 9 pulse/min (p<0.0005). In 70% of recordings fR differed from fK by 0.05 Hz or less. The results show an effect of DB on blood pressure, and the presence of a modulating effect of respiration on the Korotkoff sound.
Author(s): Di Marco LY, Zheng DC, Murray A
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: 2012 Computing in Cardiology
Year of Conference: 2012
Pages: 745-748
ISSN: 2325-8861
Publisher: IEEE
URL: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6420501
Library holdings: Search Newcastle University Library for this item
ISBN: 9781467320740