Our breathing sensors are based on respiratory inductive plethysmography (RIP) technology. They detect rib cage expansion and compression during respiratory cycles. The embedded loops are located at the thoracic and navel level and allow for the monitoring of thoracic and abdominal breathing independently.
The Hexoskin generates a low current-low voltage signal and transmits it to the RIP bands in the shirt. Based on the RIP band lengths, the signal oscillates at different frequencies. We monitor these changes in frequency and translate them to respiration values 128 times per second.
More precisely, as the user is breathing in and out, the RIP bands generate an oscillation frequency. An increase in chest band diameter (inhalation) will produce a decrease in frequency.
Keywords: Breathing, stretch, respiratory bands, oscillate, oscillation, respiratory inductance plethysmography, respiratory signal, inspiration, expiration, thoracic signal, abdominal signal, appearance, respiration, breath