Apparatus for generating data output containing physiological and motion-related information
A method of generating a data string containing physiological and motion-related information includes sensing physical activity of a subject via at least one motion sensor attached to the subject, sensing physiological information from the subject via at least one photoplethysmography (PPG) sensor attached to the subject, and processing signals from the at least one motion sensor and signals from the at least one PPG sensor into a serial data string of physiological information and motion-related information. A plurality of subject physiological parameters can be extracted from the physiological information, and a plurality of subject physical activity parameters can be extracted from the motion-related information. The serial data string is parsed out such that an application-specific interface can utilize the physiological information and motion-related information for an application that generates statistical relationships between subject physiological parameters and subject physical activity parameters in the physiological information and motion-related information.
1. A photoplethysmography (PPG) sensor module, comprising:
at least one optical emitter configured to direct optical energy to a region of a body of a subject wearing the sensor module;
at least one optical detector configured to sense optical energy absorbed, scattered and/or reflected by the body of the subject and generate a PPG signal;
at least one motion sensor configured to sense footstep motion of the subject and to generate a motion signal; and
at least one processor in electronic communication with the at least one optical detector and the at least one motion sensor, wherein the at least one processor is configured to:
process the PPG signal from the at least one optical detector and the motion signal from the at least one motion sensor to remove footstep motion artifacts from the PPG signal;
generate a blood flow pulse signal from the processed PPG signal, wherein the blood flow pulse signal has reduced motion artifacts from footstep noise;
process the blood flow pulse signal to extract a plurality of subject physiological parameters, wherein the plurality of subject physiological parameters comprise at least subject heart rate and subject heart rate variability information, and wherein at least one subject physiological parameter is extracted using a peak finding algorithm;
process the motion signal to extract a plurality of subject physical activity assessments; and
generate a multiplexed serial data output of the extracted subject physiological parameters and the extracted subject physical activity assessments, wherein the multiplexed serial data output is parsed out such that an application-specific interface can utilize the physiological parameters and the physical activity assessments for an application.
2. The PPG sensor module of claim 1 , wherein the PPG sensor module comprises light transmissive material in optical communication with the at least one optical emitter, wherein the light transmissive material comprises at least one optical lens in optical communication with the at least one optical emitter, and wherein the PPG sensor module is configured to be integrated into a wearable device worn at a limb or digit of the subject.
3. The PPG sensor module of claim 2 , wherein the PPG sensor module is integrated within a single circuit board of the wearable device.
4. The PPG sensor module of claim 1 , wherein the at least one optical emitter comprises a plurality of optical emitters wherein at least one of the plurality of optical emitters is configured to direct optical energy in a direction that is substantially perpendicular to a direction of optical energy emitted by another one of the plurality of optical emitters.
5. The PPG sensor module of claim 4 , wherein at least one of the plurality of optical emitters emits optical energy at a different optical wavelength than another one of the plurality of optical emitters.
6. The PPG sensor module of claim 4 , further comprising light transmissive material in optical communication with at least one of the plurality of optical emitters, wherein the light transmissive material is configured to be in optical communication with the body of the subject wearing the sensor module.
7. The PPG sensor module of claim 1 , wherein the at least one processor is further configured to process the blood flow pulse signal to estimate a blood flow volume of a pulse and generate an assessment of blood pressure, and wherein the multiplexed serial data output further comprises blood pressure as one of the extracted subject physiological parameters.
8. The PPG sensor module of claim 1 , wherein the multiplexed serial data output generated by the at least one processor further comprises information about data integrity of the physiological parameters and physical activity assessments.
9. The PPG sensor module of claim 1 , wherein the plurality of subject physical activity assessments comprise subject footsteps and distance traveled by the subject.
10. The PPG sensor module of claim 1 , wherein the application is a health or fitness application.
11. A wearable device comprising a photoplethysmography (PPG) sensor module integrated therewithin, the PPG sensor module comprising:
at least one optical emitter configured to direct optical energy to a region of a body of a subject wearing the wearable device;
at least one optical detector configured to sense optical energy absorbed, scattered, and/or reflected by the body of the subject and generate a PPG signal;
at least one motion sensor configured to sense footstep motion of the subject and generate a motion signal; and
at least one processor in electronic communication with the at least one optical detector and the at least one motion sensor, wherein the at least one processor is configured to:
process the PPG signal from the at least one optical detector and the motion signal from the at least one motion sensor to remove footstep motion artifacts from the PPG signal;
generate a blood flow pulse signal from the processed PPG signal, wherein the blood flow pulse signal has reduced motion artifacts from footstep noise;
process the blood flow pulse signal to extract a plurality of subject physiological parameters, wherein the plurality of subject physiological parameters comprise at least subject heart rate and subject heart rate variability information, and wherein at least one subject physiological parameter is extracted using a peak finding algorithm;
process the motion signal to extract a plurality of subject physical activity assessments; and
generate a multiplexed serial data output of the extracted subject physiological parameters and the extracted subject physical activity assessments, wherein the multiplexed serial data output is parsed out such that an application-specific interface can utilize the physiological parameters and the physical activity assessments for an application.
12. The wearable device of claim 11 , wherein the PPG sensor module is integrated within a single circuit board of the wearable device.
13. The wearable device of claim 11 , wherein the at least one optical emitter comprises a plurality of optical emitters, wherein at least one of the plurality of optical emitters is configured to direct optical energy in a direction that is substantially perpendicular to a direction of optical energy emitted by another one of the plurality of optical emitters, and further comprising light transmissive material in optical communication with at least one of the plurality of optical emitters, wherein the light transmissive material is configured to be in optical communication with the body of the subject wearing the sensor module.
14. The wearable device of claim 13 , wherein at least one of the plurality of optical emitters emits optical energy at a different optical wavelength than another one of the plurality of optical emitters.
15. The wearable device of claim 11 , wherein the at least one processor is further configured to process the blood flow pulse signal to estimate a blood flow volume of a pulse and generate an assessment of blood pressure, and wherein the multiplexed serial data output further comprises blood pressure as one of the extracted subject physiological parameters.
16. The wearable device of claim 11 , wherein the multiplexed serial data output generated by the at least one processor further comprises information about data integrity of the physiological parameters and physical activity assessments.
17. The wearable device of claim 11 , wherein the subject physical activity assessments comprise subject footsteps and distance traveled by the subject.
18. The wearable device of claim 11 , wherein the application is a health or fitness application.
19. The wearable device of claim 11 , wherein the wearable device is an earbud or a headset, or is configured to be secured to an appendage of the subject, or is configured to be integrated within clothing worn by the subject.
20. The wearable device of claim 11 , wherein the wearable device is configured to be worn at a limb of the subject, wherein the PPG sensor module comprises light transmissive material in optical communication with the at least one optical emitter, and wherein the light transmissive material comprises at least one optical lens in optical communication with the at least one optical emitter.