Journal: Heliyon

Article Title: The validity and reliability of an open source biosensing board to quantify heart rate variability

doi: 10.1016/j.heliyon.2021.e07148

Figure Lengend Snippet: Bland-Altman plots with 95% limits of agreement demonstrating the validity of quantifying log transformed (Ln) time-domain measures of heart rate variability using an open source cyton board compared to an industry-standard electrocardiogram (n = 15). Time-domain variables include: A) heart rate, B) standard deviation between R-R intervals (SDNN), C) root mean square of consecutive R-R intervals (RMSSD), and D) percentage of successive R-R differing by more than 50 ms (pNN50).

Article Snippet: The first examined the concurrent validity between the Cyton Biosensing Board with three-lead ECG (OpenBCI, Brooklyn, New York, USA) (herein referred to as cyton board) and an industry-standard ECG system (ADInstruments, Bio Amp FE231, Colorado Spring, Colorado, USA).

Techniques: Transformation Assay, Standard Deviation

Journal: Heliyon

Article Title: The validity and reliability of an open source biosensing board to quantify heart rate variability

doi: 10.1016/j.heliyon.2021.e07148

Figure Lengend Snippet: Bland-Altman plots with 95% limits of agreement demonstrating the validity of quantifying log transformed (Ln) frequency-domain measures of heart rate variability using an open source cyton board compared to an industry-standard electrocardiogram (n = 15). Frequency-domain variables include: A) relative low frequency (LF) power, B) relative high frequency (HF) power, and C) LF/HF ratio.

Article Snippet: The first examined the concurrent validity between the Cyton Biosensing Board with three-lead ECG (OpenBCI, Brooklyn, New York, USA) (herein referred to as cyton board) and an industry-standard ECG system (ADInstruments, Bio Amp FE231, Colorado Spring, Colorado, USA).

Techniques: Transformation Assay

Journal: Sensors (Basel, Switzerland)

Article Title: Towards Continuous and Ambulatory Blood Pressure Monitoring: Methods for Efficient Data Acquisition for Pulse Transit Time Estimation

doi: 10.3390/s20247106

Figure Lengend Snippet: ( a ) A three-second trace of ECG data recorded during device prototyping. ( b ) The unimodal histogram of residuals for the entire ECG dataset with 260k samples. ( c ) The residuals are approximately symmetric, so a sign bit can be transmitted along with the encoded magnitude. ( d ) A three-second trace of noisy rPPG data recorded simultaneously with the ECG. ( e ) The multimodal histogram of residuals for the rPPG. ( f ) The histogram of magnitudes of the residuals for the rPPG.

Article Snippet: The SEN-12650 ECG module (Sparkfun Electronics, Niwot, CO, USA) that is based on the AD8232 ECG front-end (Analog Devices Inc., Norwood, MA, USA) was used for recording ECG.

Techniques:

Journal: Sensors (Basel, Switzerland)

Article Title: Towards Continuous and Ambulatory Blood Pressure Monitoring: Methods for Efficient Data Acquisition for Pulse Transit Time Estimation

doi: 10.3390/s20247106

Figure Lengend Snippet: Histograms of magnitudes of residuals for ECG and PPG. ( a ) ECG with bin width = 1 is sparse (with respect to the underlying dictionary of 2 14 possible values) with only 144 bins with nonzero counts. ( b ) The number of bins with nonzero counts is approximately halved when the bin width is increased to 2. ( c ) The 13 most frequent bins are in contiguous slots. ( d ) PPG with bin width = 1 is also sparse with only 60 bins with nonzero counts. ( e ) The number of bins with nonzero counts is halved when the bin width is increased to 2, and the distribution still retains the same multimodal form. ( f ) The 13 most frequent bins are not all in contiguous slots, which demonstrates how the proposed method can sift out modes in multimodal distributions.

Article Snippet: The SEN-12650 ECG module (Sparkfun Electronics, Niwot, CO, USA) that is based on the AD8232 ECG front-end (Analog Devices Inc., Norwood, MA, USA) was used for recording ECG.

Techniques:

Journal: Sensors (Basel, Switzerland)

Article Title: Towards Continuous and Ambulatory Blood Pressure Monitoring: Methods for Efficient Data Acquisition for Pulse Transit Time Estimation

doi: 10.3390/s20247106

Figure Lengend Snippet: Hardware architecture for acquiring ECG, SCG, GCG, and rPPG.

Article Snippet: The SEN-12650 ECG module (Sparkfun Electronics, Niwot, CO, USA) that is based on the AD8232 ECG front-end (Analog Devices Inc., Norwood, MA, USA) was used for recording ECG.

Techniques:

Journal: Sensors (Basel, Switzerland)

Article Title: Towards Continuous and Ambulatory Blood Pressure Monitoring: Methods for Efficient Data Acquisition for Pulse Transit Time Estimation

doi: 10.3390/s20247106

Figure Lengend Snippet: Representative results of data recorded from Subject 4 at 3200 Hz. ( a ) Ten-second trace of raw ADC codes for ECG, chest PPG, finger PPG, SCG-Z, and GCG-Z data. ( b ) Filtering with a seventh-order median filter reveals the underlying signal in the electronic noise corrupted raw SCG-Z signal. ( c ) Compression table sizes for the standard and proposed methods. ( d ) Compression ratios for the standard and the proposed methods.

Article Snippet: The SEN-12650 ECG module (Sparkfun Electronics, Niwot, CO, USA) that is based on the AD8232 ECG front-end (Analog Devices Inc., Norwood, MA, USA) was used for recording ECG.

Techniques: