Abstract: Described herein are systems and methods for calibrating dry electrode bioelectrical impedance measurements. These method and apparatuses may be used for sensing bioelectrical impedance for ambulatory and or long-term measurements. Calibration of bioelectrical impedance sensing may be performed by using measurements taken during a shorted configuration of the apparatus, in which the same current is applied to both the source and sink stimulation electrodes, to modify measurements taken in a forward and/or reverse configuration in which current is applied to either the source and/or sink.

Abstract: A method of controlling a wearable device including a signal generator, two stimulation electrodes, and two sensing electrodes to monitor a level of edema of a subject, includes generating, by the generator, a signal that causes a current to flow between the stimulation electrodes and measuring an impedance between the sensing electrodes disposed on a skin of the subject at an interval of time during a testing period, thereby providing impedance measurements, validating each impedance measurement against a model set of impedance measurements, eliminating a measurement from the impedance measurements if the measurement fails the validating, thereby providing a validated sub-set of impedance measurements, converting each of the validated sub-set of impedance measurements to an edema index, thereby providing edema indices, averaging the edema indices and generating an average edema index for the testing period, and generating an alert depending on the average edema index.

Abstract: In one aspect, a photoplethysmograph system to measure a user's heart rate includes one or more light-emitting diodes (LED) that provide a constantly-on light signal during a measurement period. The one or more light-emitting diodes are in optical contact with an epidermal surface of the user. The one or more light-emitting diodes emit a light signal into the tissue of the user, and wherein the tissue contains a pulsating blood flow. A light-intensity sensor circuit converts the reflected LED light from the tissue into a second signal that is proportional to a reflected light intensity. The second signal includes a voltage or current signal. A computer-processing module calculates the user's beat-to-beat heart rate from the second current signal.

Abstract: In one aspect, a photoplethysmograph system to measure a user's heart rate includes one or more light-emitting diodes (LED) that provide a constantly-on light signal during a measurement period. The one or more light-emitting diodes are in optical contact with an epidermal surface of the user. The one or more light-emitting diodes emit a light signal into the tissue of the user, and wherein the tissue contains a pulsating blood flow. A light-intensity sensor circuit converts the reflected LED light from the tissue into a second signal that is proportional to a reflected light intensity. The second signal includes a voltage or current signal. A computer-processing module calculates the user's beat-to-beat heart rate from the second current signal.

Abstract: Described herein are systems and methods for calibrating dry electrode bioelectrical impedance measurements. These method and apparatuses may be used for sensing bioelectrical impedance for ambulatory and or long-term measurements. Calibration of bioelectrical impedance sensing may be performed by using measurements taken during a shorted configuration of the apparatus, in which the same current is applied to both the source and sink stimulation electrodes, to modify measurements taken in a forward and/or reverse configuration in which current is applied to either the source and/or sink.

Abstract: In one aspect, a photoplethysmograph system to measure a user's heart rate includes one or more light-emitting diodes (LED) that provide a constantly-on light signal during a measurement period. The one or more light-emitting diodes are in optical contact with an epidermal surface of the user. The one or more light-emitting diodes emit a light signal into the tissue of the user, and wherein the tissue contains a pulsating blood flow. A light-intensity sensor circuit converts the reflected LED light from the tissue into a second signal that is proportional to a reflected light intensity. The second signal includes a voltage or current signal. A computer-processing module calculates the user's beat-to-beat heart rate from the second current signal.

Abstract: In one aspect, a photoplethysmograph system to measure a user's heart rate includes one or more light-emitting diodes (LED) that provide a constantly-on light signal during a measurement period. The one or more light-emitting diodes are in optical contact with an epidermal surface of the user. The one or more light-emitting diodes emit a light signal into the tissue of the user, and wherein the tissue contains a pulsating blood flow. A light-intensity sensor circuit converts the reflected LED light from the tissue into a second signal that is proportional to a reflected light intensity. The second signal includes a voltage or current signal. A computer-processing module calculates the user's beat-to-beat heart rate from the second current signal.

Abstract: Devices and methods including wearable monitoring devices for a user's wrist that may be configured to intelligently and automatically decide when to monitor a user without requiring direct user input.

Abstract: In one aspect, a photoplethysmograph system to measure a user's heart rate includes one or more light-emitting diodes (LED) that provide a constantly-on light signal during a measurement period. The one or more light-emitting diodes are in optical contact with an epidermal surface of the user. The one or more light-emitting diodes emit a light signal into the tissue of the user, and wherein the tissue contains a pulsating blood flow. A light-intensity sensor circuit converts the reflected LED light from the tissue into a second signal that is proportional to a reflected light intensity. The second signal includes a voltage or current signal. A computer-processing module calculates the user's beat-to-beat heart rate from the second current signal.

Abstract: Techniques and systems are disclosed for monitoring multiple indoor and outdoor climate parameters and wirelessly transmitting the monitored data to a network for on-line analysis and dissemination. In one aspect, a monitoring device includes multiple sensors to monitor air quality modalities and generate corresponding monitored air quality data. The monitoring device includes a processor in communication with the multiple sensors to receive and process the monitored air quality data generated from the multiple sensors. Additionally, the monitoring device includes a display unit in communication with the processor to display the processed air quality data. The monitoring device includes a data communication unit to transmit the processed air quality data to a server. The server stores and optimizes the data through cross-calibration and makes the data available to persons who have purchased the monitoring devices and who wish to share the data in a social network.

Abstract: Techniques and systems are disclosed for monitoring multiple indoor and outdoor climate parameters and wirelessly transmitting the monitored data to a network for on-line analysis and dissemination. In one aspect, a monitoring device includes multiple sensors to monitor air quality modalities and generate corresponding monitored air quality data. The monitoring device includes a processor in communication with the multiple sensors to receive and process the monitored air quality data generated from the multiple sensors. Additionally, the monitoring device includes a display unit in communication with the processor to display the processed air quality data. The monitoring device includes a data communication unit to transmit the processed air quality data to a server. The server stores and optimizes the data through cross-calibration and makes the data available to persons who have purchased the monitoring devices and who wish to share the data in a social network.

Abstract: A method and system for determining a secondary mileage estimate for a vehicle is disclosed. The method includes measuring a travel speed of the vehicle over a period of time; integrating the current speed over said period of time to generate a secondary mileage estimate; and at least one of storing said secondary mileage estimate or transmitting said secondary mileage estimate to a server.