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What are biometric
parameters and why do
they matter?​
Ryan Kraudel
Valencell, Inc.
© 2019 Valencell Inc.
© 2019 Valencell, Inc
What is PPG?
Photoplethysmography
© 2019 Valencell, Inc
Wearables
WearablesHealth/Medical Devices
Smart PhonesAR/VR HeadsetsIndustrial, Military
Hearing Aid...
© 2019 Valencell, Inc
”Some fitness trackers may fall short in
measuring heart rate accurately, study
finds”
“Activity tra...
©2019 Valencell. Inc
Top 5 Challenges in wearable PPG
Source: “Optical heart-rate measurement’s top 5 challenges” Dr. Stev...
© 2019 Valencell, Inc
Feature-Rich Wave Form Enables Numerous Measurements
Pulse Pressure
RRi
(HRV, Cardiac Functioning)
B...
© 2019 Valencell, Inc
Accurate Measurements Enable Valuable Use Cases
Health Diagnostics
AFib Detection
Hypertension Manag...
© 2019 Valencell, Inc
What Are Biometric Parameters?
A parameter, generally, is any
characteristic that can help in defini...
© 2019 Valencell, Inc
What Are Biometric Parameters?
Signal Quality Indicator
Second-by-second numerical indicator of the ...
© 2019 Valencell, Inc
Signal Quality Indicator
Second-by-second numerical indicator of the quality of the
incoming PPG sig...
© 2019 Valencell, Inc
Normalized Pulsatile Amplitude
Provides insights into blood volume enabling estimations of
ambulator...
© 2019 Valencell, Inc
Non-Pulsatile Amplitude An indication of the light signal not driven by the pulse wave.
Non-Pulsatil...
© 2019 Valencell, Inc
Ambient Light Average
An estimate of the total amount of light coming into the
photodetector, includ...
© 2019 Valencell, Inc
Activity Categorization
Categorizing movement patterns for contextual inputs to
biometric assessment...
© 2019 Valencell, Inc
Why do Biometric Parameters Matter?
New Use Cases Data Quality Fewer Sensors
Using Biometric
Parameters in Wearables
© 2019 Valencell, Inc
Pain Management Device Using Biometric Parameters
“Valencell allowed us to replace all of
the EEG on...
© 2019 Valencell, Inc
Tracking consciousness in pilots in high-G environments
Airforce subjects were
evaluated in a high-G...
© 2019 Valencell, Inc
In high-G environments, a jump in heart rate and drop in
pulsatile blood volume indicates the subjec...
© 2019 Valencell, Inc
This Airforce subject lost consciousness for several seconds
9Gz
5Gz
5-9Gz
7Gz
9Gz
HeartRate(BPM)
No...
© 2019 Valencell, Inc
Real-time motion-tolerant normalized PPG amplitude tracks with
systolic blood pressure
• Motion-Tole...
Thank You!
Ryan Kraudel
kraudel@valencell.com
Twitter: @kraudel
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What are biometric parameters and why do they matter?

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Biometric parameters don't get much attention, but these hidden gems, found in leading biometric sensor technology, hold a great deal of potential for next-generation wearables and hearables. PPG sensor technology has come to dominate the market for biometric sensors in wearables in part because the PPG waveform can provide a broad range of insights on blood flow characteristics beyond simple heart rate measurement. This enables a rich set of biometric measures, including continuous heart rate, R-R interval (heart rate variability), VO2 max, cardiac efficiency, blood pressure, and more.

In this webinar, we explore how biometric parameters enable device makers to develop new use cases based on PPG sensors and how these parameters also provide confidence in data quality for user experiences and user interfaces.

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What are biometric parameters and why do they matter?

  1. 1. What are biometric parameters and why do they matter?​ Ryan Kraudel Valencell, Inc. © 2019 Valencell Inc.
  2. 2. © 2019 Valencell, Inc What is PPG? Photoplethysmography
  3. 3. © 2019 Valencell, Inc Wearables WearablesHealth/Medical Devices Smart PhonesAR/VR HeadsetsIndustrial, Military Hearing Aids PPG Sensors Have Become the Dominant Biometric Sensor Technology in a Wide Range of Devices
  4. 4. © 2019 Valencell, Inc ”Some fitness trackers may fall short in measuring heart rate accurately, study finds” “Activity trackers not always great for monitoring exercise heart rate” “Don't bank on heart rate accuracy from your fitness tracker” Creating accurate biometric wearables is difficult Why is it so difficult? • Solving fundamental scientific challenges – intense motion-tolerance, advanced metrics • Deep cross-discipline expertise – hardware, software, optics, mechanics, physiology and data science • Rigorous testing & validation across a broad, diverse population set • Manufacturing expertise at scale It requires:
  5. 5. ©2019 Valencell. Inc Top 5 Challenges in wearable PPG Source: “Optical heart-rate measurement’s top 5 challenges” Dr. Steven LeBoeuf; EDN Magazine; 8-25-15 Optical Noise Skin Tone Blood Perfusion Sensor Location/Form-Factor Crossover Problem
  6. 6. © 2019 Valencell, Inc Feature-Rich Wave Form Enables Numerous Measurements Pulse Pressure RRi (HRV, Cardiac Functioning) Breathing Rate (Metabolic Status) Perfusion Variation Heart Rate Ideal PPG Waveform
  7. 7. © 2019 Valencell, Inc Accurate Measurements Enable Valuable Use Cases Health Diagnostics AFib Detection Hypertension Management Heat Stress Detection Fitness Level Stress Levels Core Temperature LACTATE THRESHOLD REAL-TIME BIOMETRICS PARAMETERS
  8. 8. © 2019 Valencell, Inc What Are Biometric Parameters? A parameter, generally, is any characteristic that can help in defining or classifying a particular system. That is, a parameter is an element of a system that is useful, or critical, when identifying the system, or when evaluating its performance, status, condition, etc. - Wikipedia A Biometric Parameter reflects an element or elements of the vascular system and/or blood flow dynamics that are useful, or critical, when identifying the system, or when evaluating its performance, status, condition, etc. - Valencell
  9. 9. © 2019 Valencell, Inc What Are Biometric Parameters? Signal Quality Indicator Second-by-second numerical indicator of the quality of the incoming PPG signal. Normalized Pulsatile Amplitude Provides insights into blood volume enabling estimations of ambulatory blood flow characteristics. Non-Pulsatile Amplitude An indication of the light signal not driven by the pulse wave. Biometric Parameter Definition Ambient Light Average An estimate of the total amount of light coming into the photodetector, including from the LED’s and other light sources. Activity Categorization Categorizing movement patterns for contextual inputs to biometric assessments.
  10. 10. © 2019 Valencell, Inc Signal Quality Indicator Second-by-second numerical indicator of the quality of the incoming PPG signal. Time (s) BiometricSignalQuality Blue dots represent 100% confidence Less than 100% confidence
  11. 11. © 2019 Valencell, Inc Normalized Pulsatile Amplitude Provides insights into blood volume enabling estimations of ambulatory blood flow characteristics. Normalized Pulsatile Amplitude Ideal PPG Waveform Example blood flow characteristics: • Perfusion • Pulse pressure • Blood oxygenation • Cardiac output
  12. 12. © 2019 Valencell, Inc Non-Pulsatile Amplitude An indication of the light signal not driven by the pulse wave. Non-Pulsatile Amplitude Ideal PPG Waveform Example characteristics: • Breathing rate • Respiration characteristics • Cardiovascular health
  13. 13. © 2019 Valencell, Inc Ambient Light Average An estimate of the total amount of light coming into the photodetector, including from the LED’s and other light sources.
  14. 14. © 2019 Valencell, Inc Activity Categorization Categorizing movement patterns for contextual inputs to biometric assessments.
  15. 15. © 2019 Valencell, Inc Why do Biometric Parameters Matter? New Use Cases Data Quality Fewer Sensors
  16. 16. Using Biometric Parameters in Wearables
  17. 17. © 2019 Valencell, Inc Pain Management Device Using Biometric Parameters “Valencell allowed us to replace all of the EEG on the forehead using HRV.” “One of the great things about the Valencell sensor is the ability to get signal strength data alongside your actual signal...It’s totally essential.” Webinar: https://www.youtube.com/watch?v=wh TDmYndNrA
  18. 18. © 2019 Valencell, Inc Tracking consciousness in pilots in high-G environments Airforce subjects were evaluated in a high-G simulator while wearing a Valencell-powered biometric earbud
  19. 19. © 2019 Valencell, Inc In high-G environments, a jump in heart rate and drop in pulsatile blood volume indicates the subject has lost consciousness 9Gz 5Gz 5-9Gz 7Gz 9Gz HeartRate(BPM) NormalizedPPGAmplitude(a.u.) Time (seconds) Heart Rate (HR) & Normalized PPG Amplitude (NPA) vs. Time for Airforce Subject in High-G Simulator
  20. 20. © 2019 Valencell, Inc This Airforce subject lost consciousness for several seconds 9Gz 5Gz 5-9Gz 7Gz 9Gz HeartRate(BPM) NormalizedPPGAmplitude(a.u.) Time (seconds) Heart Rate (HR) & Normalized PPG Amplitude (NPA) vs. Time for Airforce Subject in High-G Simulator HR Threshold NPA Threshold
  21. 21. © 2019 Valencell, Inc Real-time motion-tolerant normalized PPG amplitude tracks with systolic blood pressure • Motion-Tolerant HR • Motion-Tolerant RRi • Motion-Tolerant PPG Magnitude • Non-Pulsatile Magnitude • Signal Quality Valencell generates numerous motion- tolerant PPG parameters each second, including the PPG Magnitude, which correlates with blood pulse volume and systolic blood pressure. As long as the subject’s perfusion is high enough, Valencell has found that it’s motion-tolerant PPG magnitude output can track systolic blood pressure (as measured by a commercial ambulatory blood pressure cuff). This data was collected during an indoor cycling protocol. Time (seconds) SystolicBloodPressure(mmHg) NormalizedPPGMagnitude(a.u.) 90-sec average trend line of Valencell’s PPG Magnitude
  22. 22. Thank You! Ryan Kraudel kraudel@valencell.com Twitter: @kraudel
  • dingotrail

    May. 23, 2019

Biometric parameters don't get much attention, but these hidden gems, found in leading biometric sensor technology, hold a great deal of potential for next-generation wearables and hearables. PPG sensor technology has come to dominate the market for biometric sensors in wearables in part because the PPG waveform can provide a broad range of insights on blood flow characteristics beyond simple heart rate measurement. This enables a rich set of biometric measures, including continuous heart rate, R-R interval (heart rate variability), VO2 max, cardiac efficiency, blood pressure, and more. In this webinar, we explore how biometric parameters enable device makers to develop new use cases based on PPG sensors and how these parameters also provide confidence in data quality for user experiences and user interfaces.

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