White Papers

Applicability of a Forearm-Based Biometric Sensor for Measuring Heart Rate During Exercise

This report examines the accuracy of Valencell's PerformTek® biometric sensor technology integrated into the Scosche Rhythm+ heart rate monitoring armband.  This validation effort was performed by Campbell University and the data was presented at SEACSM 2014 in Greenville, SC.

Earbud-Based Sensor for the Assessment of Energy Expenditure, Heart Rate, and VO2 max

Introduction/Purpose: The goal of this program was to determine the feasibility of a novel noninvasive, highly miniaturized optomechanical earbud sensor for accurately estimating total energy expenditure (TEE) and maximum oxygen consumption (VO2max). The optomechanical sensor module, small enough to fit inside commercial audio earbuds, was previously developed to provide a seamless way to measure blood flow information during daily life activities. The sensor module was configured to continuously measure physiological information via photoplethysmography (PPG) and physical activity information via accelerometry. This information was digitized and sent to a microprocessor where digital signal processing (DSP) algorithms extract physiological metrics in real-time. These metrics were streamed wirelessly from the earbud to a computer. 

PerformTek® Precision Biometrics:
Engaging the Burgeoning Mobile Health and Fitness Market

This report examines the growing market for wearable sports and health wireless monitoring devices and how PerformTek Precision Biometrics addresses this growing market opportunity by uniquely combining accurate vital sign monitoring with activity tracking.

PerformTek® cycling cadence sensor technology

As you may know, pedometers and wrist activity monitors don’t measure your cycling cadence.  Instead, you have to buy an expensive piece of new hardware to mount on your bike in order to get a useful measurement. But we’ve whipped-up some new patent-pending tech that gives PerformTek-powered earbuds the ability to accurately measure cycling cadence, especially during steady state.  This technology will be integrated into existing PerformTek-powered earbuds and not require any additional hardware to be mounted on the bicycle. Soon we’ll be licensing this tech for use in the consumer sector, so that you can measure everything you care about with your PerformTek-powered earbuds.  Dr. Eschbach presented his first scientific study on this new tech at 60th Annual Meeting and 4th World Congress on Exercise is Medicine of the American College of Sports Medicine. 

Valencell Wrist-Based Sensor Validation

This report documents the clinical examination Valencell PerformTek® wrist-based biometric sensor that resulted in valid data when compared to chest strap benchmark. Similar group means, low percent error and bias, high correlations in combination, appropriate frequency distribution and similar rates of poor tracking indicate the PerformTek® wrist based device provides similar validity as chest strap sensors under these conditions.

Validation and Reliability of PerformTek® Earbud Heart Rate Sensor Utilizing 12 Lead ECG

This report examines the accuracy and repeatability of Valencell, Inc.’s PerformTek® earbud sensor relative to a 12 lead electrocardiogram for measuring heart rate during exercise.

Validation of iriver ON® with PerformTek® Sensor Technology
Earbud Heart Rate Sensor

This report examines the accuracy of Valencell, Inc.’s PerformTek® earbud sensor technology integrated into the iriver ON® Bluetooth headset relative to a traditional chest strap heart rate monitor during multiple levels of exercise intensity.  Updated June 2013 with two new exemplary plots.