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Student name:
Danit Levy
Advisor name: Dr.
Zehava Blachman
4. Results
תערוכת פרויקטי גמר 2013 2
Department:
Medical Engineering
The Response of Peripheral Microcirculation to
Slow Breathing Guiding Device
3.3. Signals Processing
Figure 2: Signals during a RESPeRATE session .
• The signals were sampled at 500 Hz.
• LDF signal was filter with Butterworth
low pass filter.
• Pearson product moment Correlation (corr)
was made between respiratory and LDF
signals at different breathing rates.
• Software algorithm was programmed to
display RR interval from the ECG signals.
• Statistical analysis was performed using
paired t test significance level p<0.05
Figure 3 : Correlation between respiration and LDF signals at different bpm
5. Conclusions
• The breathing exercise applied seems to entrain the cardiovascular system mostly
at breathing rate of 6 8 bpm. At lower rates, vasomotion frequencies, the known
spontaneous oscillation of the arterioles, dominates the capillary flow.
• Breathing rate is associated with tissue oxygenation. At low enough breathing
rate(<6 bpm) the peripheral microcirculation fails to provide blood supply to the
peripheral tissues.
• The results may have a clinical potential in expressing the cardio pulmonary control
of blood supply to the peripheral microcirculation.
Figure 4 : tcPO2 Vs bpm for
subjects who reach 5 bpm.
Advance of time