The Short-Term Effect of Occupational Levels of 50 Hz Electromagnetic Field on Human Heart Rate Variability.
Research
RF Safe Research Library
Jan 1, 2021
This double-blind randomized sham-controlled repeated-measures study examined short-term 50 Hz ELF-EMF exposure (28 μT) to the chest and its effects on HR and HRV in 34 healthy young men. HR deceleration occurred in both EMF and sham conditions, but several HRV indices (SDNN, RMSSD, LF, HF) increased only in the EMF…
Miniaturized Battery-Free Wireless Systems for Wearable Pulse Oximetry.
Research
RF Safe Research Library
Jan 1, 2017
This engineering study describes miniaturized, flexible, battery-free wearable pulse oximetry systems that use near-field communication (NFC) for wireless operation. The devices capture and transmit photoplethysmograms to derive blood oxygenation, heart rate, and heart rate variability. The abstract reports…
A wearable bluetooth LE sensor for patient monitoring during MRI scans.
Research
RF Safe Research Library
Jan 1, 2016
This engineering paper reports a prototype wearable patient-monitoring device that transmits vital-sign measurements via Bluetooth LE during MRI. Across 7 MRI acquisitions (25 minutes total), the authors report no Bluetooth packet loss, increased PPG noise during MRI, and no effect on temperature/humidity readings.…