Sensors, Free Full-Text

September 30,2024

The bioelectrical impedance analysis (BIA) method is widely used to predict percent body fat (PBF). However, it requires four to eight electrodes, and it takes a few minutes to accurately obtain the measurement results. In this study, we propose a faster and more accurate method that utilizes a small dry electrode-based wearable device, which predicts whole-body impedance using only upper-body impedance values. Such a small electrode-based device typically needs a long measurement time due to increased parasitic resistance, and its accuracy varies by measurement posture. To minimize these variations, we designed a sensing system that only utilizes contact with the wrist and index fingers. The measurement time was also reduced to five seconds by an effective parameter calibration network. Finally, we implemented a deep neural network-based algorithm to predict the PBF value by the measurement of the upper-body impedance and lower-body anthropometric data as auxiliary input features. The experiments were performed with 163 amateur athletes who exercised regularly. The performance of the proposed system was compared with those of two commercial systems that were designed to measure body composition using either a whole-body or upper-body impedance value. The results showed that the correlation coefficient ( r 2 ) value was improved by about 9%, and the standard error of estimate (SEE) was reduced by 28%.

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Sensors for Pressure Mapping and Force Measurement

Advanced Sensor Research - Wiley Online Library

Battery-free, wireless sensors for full-body pressure and temperature mapping

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Sensors and Actuators B: Chemical, Journal

World's Longest Wireless Range - Powered by LoRa technology, the long-range yet low-power system offers the industry’s longest receiving range in the market (1/4 mile). Our long-range coverage enables its use in areas challenging for most residential Wi-Fi systems, such as basements, outdoor porch/patio areas, sheds, free-standing garages, even remote outbuildings on your property.

YoLink Smart Temperature Humidity Sensor Works w/Alexa Ifttt, 1/4 Mile Super Long Range Wireless Digital Hygrometer with Alarm

Printable All-Paper Pressure Sensors with High Sensitivity and Wide Sensing Range

Sensors, Free Full-Text