According to an aspect there is provided a method of determining the health of a subject, the method comprising determining the absolute humidity and volume of air exhaled by the subject over time; and analysing the determined absolute humidity and volume of air exhaled by the subject to determine a characteristic of the air that was above the isothermic saturation boundary, ISB, of the subject.

A device for increasing a user's awareness of his or her breathing includes a clip configured to attach to a user's nose, a hinge connected to the clip, an air deflection plate pivotably connected to the hinge and one or more sensors coupled with the air deflection plate. The air deflection plate is configured to pivot relative to the clip to at least partially deflect air flow into or out of a nostril while the air deflection plate is exterior to the nostril and the clip is attached to the user's nose. The one or more sensors are configured to sense data pertaining to the user's breathing through the nostril. A method for increasing breathing awareness includes, in response to air flow across an air deflection plate pivotably coupled with a clip gripping a user's nose, receiving breathing data with one or more sensors coupled with the air deflection plate.

A measurement device for a human respiratory system function comprises a respiration measurement device (20). The respiration measurement device (20) receives a respiratory air flow and senses the respiratory air flow to generate a set of sensing signals, and performs calculation according to the sensing signals to generate a human respiratory system parameter, the sensing signals comprising at least an absolute pressure of the respiratory air flow. The respiration measurement device (20) comprises a respiration measurement channel (21). The absolute pressure generated by a respiratory air flow of a user in the respiration measurement channel (21) that is in a single-end sealed state is measured. The absolute pressure corresponds to the pressure in the lung of the user.

According to various, but not necessarily all, embodiments there is provided an apparatus comprising means for: determining a time difference between arrival at a device of a sound produced by a sound source and an electromagnetic signal reflected from a surface, of a body comprising the sound source, which vibrates when the sound is produced; and providing the time difference to enable determination of a fluid temperature based on the speed of sound through the fluid between the body and the device.

A respiration rate measurement apparatus including a plurality of sensors for concurrently generating temperature, pressure and acoustic data representing one or more successive breaths and a method of generating fusion data from the plurality of data streams as a weighted average based on determined correlation coefficients and calculation of a respiratory rate.

Apparatus for quantifying the amount of re-breathing due to bedding materials. The re-breathing analyzer applies heated air to the material under test through an exhaust port in a probe and receives return air from an intake port in the probe. The exhaust and intake ports are placed to engage the material under test when the probe is in contact with the material. In one embodiment, the probe has a surface that is exposed through a top surface of a housing for the analyzer whereby the material under test is placed on the top surface for testing. The analyzer includes a differential temperature measuring instrument that determines the temperature of the return air, where an increase of the temperature of the return air above the temperature of the ambient air indicates the presence and quantity of re-breathing due to the material under test.

Methods, systems, and devices for assessing breathing disorders such as apneas and hypopneas are provided. An airflow monitoring device can be positioned in thermal communication with respiratory airflow (nasal and/or oral airflow). The airflow monitoring device can include a thermistor configured to measure heating and cooling cycles of respiratory airflow and determine respiratory airflow velocity from analysis of thermistor cooling. This velocity, alone or in combination with other physiological parameters, such as blood oxygen saturation, respiration effort, heart rate, body movement, etc. can be employed to assess sleep disorders.

Systems and method for conducting respiratory therapy in a respiratory system can adjust a flow of respiratory gases to a patient based upon a detected patient breath cycle. The respiratory system can include a non-sealed patient interface. The respiratory system can be configured to deliver a high flow therapy. A patient breath cycle may be determined using one or more measured parameters, such as a flow rate, a blower motor speed, and/or a system pressure. A flow source may be adjusted to have a phase matching that of the patient's breath cycle, such that flow in increased in response to the patient inhaling, and decreased in response to the patient exhaling.

A system for measuring a mass of exhaled carbon for weight loss monitoring. The system includes a capture device for capturing exhaled breath and determining a mass of carbon in the exhaled breath, a respiratory inductive plethysmograph (RIP) device incorporated into apparel, and a processor incorporated into a computing device. Mass of exhaled carbon may be determined by the capture device and computing device alone. Alternatively, mass of exhaled carbon may be determined by the RIP device and the computing device alone, after calibration of the RIP device using the capture device.

A breathing apparatus includes a tube having a proximal end connected to a breathing mask and a distal end connected to a splitter. A first branch has a proximal end connected to the splitter and an open distal end. A first sensor is arranged within the first branch and operatively connected to a processing module. A first flow control valve is arranged in the first branch and operatively connected to the processing module. A second branch has a proximal end connected to the splitter and a distal end connected to an inflatable reservoir. A second sensor is arranged within the second branch and operatively connected to a processing module. A second flow control valve arranged in the second branch and operatively connected to the processing module. The breathing apparatus can adjust a pneumatic resistance according to a programmed training protocol and counteract hyperventilation by recirculating exhaled air.