Google Scientists Develop New Method to Measure Heart Rate Using ANC Earbuds
Google scientists have recently developed a groundbreaking method called audioplethysmography (APG) to accurately measure heart rate using off-the-shelf active noise-canceling (ANC) earbuds. In a software update, Google introduced this new technique that utilizes ultrasound signals bounced off the inside of the ear canal to detect skin surface perturbations as blood pumps through it. This innovation has the potential to revolutionize heart rate monitoring technology.
One key advantage of the APG approach is its resiliency. It can accurately measure heart rate even with a bad ear seal, differing ear canal size, or darker skin tones. Unlike traditional heart rate monitoring, which can be sensitive to movement or a bad fit, the APG method’s accuracy remains unaffected by these factors.
However, the ultrasound method does face some limitations. Although it works fine even when music is playing, it encounters issues in noisy environments and with body motion, as these can distort the signal. Nevertheless, Google’s researchers overcame the motion problem by employing multiple frequencies and extracting the most accurate signal among them.
To evaluate the effectiveness of the APG technique, a study involving 153 participants was conducted. Both commercially available earbuds and purpose-built prototypes were tested to assess the effect of microphone placement. The results showed promising findings, with a median error rate of 3.21 percent for heart rate and 2.70 percent for heart rate variability using the APG method.
In comparison, traditional heart rate monitoring headphones utilize the photoplethysmography (PPG) approach. While PPG has been widely used, it can be sensitive to intense movement or an improper fit, leading to inaccurate readings. The APG method improves upon this drawback, providing a more reliable and accurate alternative for heart rate measurement.
This groundbreaking development by Google scientists opens up new possibilities for wearable technology and healthcare. The utilization of ANC earbuds for heart rate monitoring could make it more accessible and convenient for individuals to track their cardiovascular health. With further advancements, this technology may eventually become a standard feature in future earbuds or other wearable devices.
In summary, Google’s audioplethysmography (APG) method using ANC earbuds demonstrates tremendous potential for accurately measuring heart rate. Its resilience against poor ear seals, different ear canal sizes, and darker skin tones sets it apart from traditional heart rate monitoring techniques. As technology continues to evolve, we can expect more innovative solutions to enhance our everyday lives.
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