Estimation of spontaneous baroreflex sensitivity using transfer function analysis: effects of positive pressure ventilation

2007 ◽  
Vol 52 (1) ◽  
pp. 66-72 ◽  
Author(s):  
Martin Glos ◽  
Dietrich Romberg ◽  
Susanne Endres ◽  
Ingo Fietze
Keyword(s):  
Transfer Function ◽  
Baroreflex Sensitivity ◽  
Positive Pressure Ventilation ◽  
Function Analysis ◽  
Positive Pressure ◽  
Transfer Function Analysis ◽  
Spontaneous Baroreflex

scholarly journals Role of aortic arch vascular mechanics in cardiovagal baroreflex sensitivity

2016 ◽  
Vol 311 (1) ◽  
pp. R24-R32 ◽  
Author(s):  
Stephen A. Klassen ◽  
Daniele Chirico ◽  
Kylie S. Dempster ◽  
J. Kevin Shoemaker ◽  
Deborah D. O'Leary
Keyword(s):  
Sex Differences ◽  
Transfer Function ◽  
Aortic Arch ◽  
Baroreflex Sensitivity ◽  
Function Analysis ◽  
Low Frequency ◽  
Vascular Mechanics ◽  
Relative Contribution ◽  
Transfer Function Analysis

Cardiovagal baroreflex sensitivity (cvBRS) measures the efficiency of the cardiovagal baroreflex to modulate heart rate in response to increases or decreases in systolic blood pressure (SBP). Given that baroreceptors are located in the walls of the carotid sinuses (CS) and aortic arch (AA), the arterial mechanics of these sites are important contributors to cvBRS. However, the relative contribution of CS and AA mechanics to cvBRS remains unclear. This study employed sex differences as a model to test the hypothesis that differences in cvBRS between groups would be explained by the vascular mechanics of the AA but not the CS. Thirty-six young, healthy, normotensive individuals (18 females; 24 ± 2 yr) were recruited. cvBRS was measured using transfer function analysis of the low-frequency region (0.04–0.15 Hz). Ultrasonography was performed at the CS and AA to obtain arterial diameters for the measurement of distensibility. Local pulse pressure (PP) was taken at the CS using a hand-held tonometer, whereas AA PP was estimated using a transfer function of brachial PP. Both cvBRS (25 ± 11 vs. 19 ± 7 ms/mmHg, P = 0.04) and AA distensibility (16.5 ± 6.0 vs. 10.5 ± 3.8 mmHg−1 × 10−3, P = 0.02) were greater in females than males. Sex differences in cvBRS were eliminated after controlling for AA distensibility ( P = 0.19). There were no sex differences in CS distensibility (5.32 ± 2.3 vs. 4.63 ± 1.3 mmHg−1 × 10−3, P = 0.32). The present data demonstrate that AA mechanics are an important contributor to differences in cvBRS.

scholarly journals Spatial Unmasking Effect on Speech Reception Threshold in the Median Plane

2020 ◽  
Vol 10 (15) ◽  
pp. 5257
Author(s):  
Nathan Berwick ◽  
Hyunkook Lee
Keyword(s):  
Transfer Function ◽  
Input Signal ◽  
Function Analysis ◽  
Median Plane ◽  
Speech Reception ◽  
Transfer Function Analysis ◽  
Spatial Unmasking ◽  
Head Related Transfer Function ◽  
Speech Reception Thresholds ◽  
Energy Weighting

This study examined whether the spatial unmasking effect operates on speech reception thresholds (SRTs) in the median plane. SRTs were measured using an adaptive staircase procedure, with target speech sentences and speech-shaped noise maskers presented via loudspeakers at −30°, 0°, 30°, 60° and 90°. Results indicated a significant median plane spatial unmasking effect, with the largest SRT gain obtained for the −30° elevation of the masker. Head-related transfer function analysis suggests that the result is associated with the energy weighting of the ear-input signal of the masker at upper-mid frequencies relative to the maskee.

Transfer Function Analysis and Broadband Scalable Model for On-Chip Spiral Inductors

2011 ◽  
Vol 59 (7) ◽  
pp. 1696-1708 ◽  
Author(s):  
Huang Wang ◽  
Lingling Sun ◽  
Jun Liu ◽  
Huanhuan Zou ◽  
Zhiping Yu ◽  
...  
Keyword(s):  
Transfer Function ◽  
Function Analysis ◽  
Transfer Function Analysis ◽  
Spiral Inductors ◽  
On Chip

scholarly journals A novel method for assessing cerebral autoregulation in preterm infants using transfer function analysis

2015 ◽  
Vol 79 (3) ◽  
pp. 453-459 ◽  
Author(s):  
Zachary A. Vesoulis ◽  
Steve M. Liao ◽  
Shamik B. Trivedi ◽  
Nathalie El Ters ◽  
Amit M. Mathur
Keyword(s):  
Transfer Function ◽  
Preterm Infants ◽  
Cerebral Autoregulation ◽  
Function Analysis ◽  
Transfer Function Analysis ◽  
Novel Method
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