Abstract: The present disclosure provides a device and method for measuring metabolic rate using sequential gas delivery. By delivering a first gas with a known quantity of gas X and a volume smaller than the subject's alveolar volume, and subsequently delivering a second gas to the subject, the metabolic rate can be accurately and precisely determined. The device measures an exhaled partial pressure of gas X and computes the metabolic rate based on the inhaled partial pressure of gas X, the exhale partial pressure of gas X, and the volume of the first gas.

Abstract: A system (100) and a method (200) for providing intermittent hypoxia using sequential gas delivery to a subject are disclosed. The method (200) comprises the step (204) of inducing a normoxic end tidal partial pressure of oxygen using a sequential gas delivery system within a first specific number of breaths for a first duration and the step (208) of inducing a hypoxic end tidal partial pressure of oxygen using the sequential gas delivery system within a second number of breaths for a second duration and repeating the steps for a target number of cycles until a therapeutically effective dose of intermittent hypoxia is attained. The sequential gas delivery system (100) may control the end tidal partial pressure of carbon dioxide simultaneously and independently of the end tidal partial pressure of oxygen. The method (200) may be applied in the treatment of a pathological condition in a subject or for improving a health condition of a subject.

Abstract: A camera includes a feature that associates meaningful information with a photograph to indicate where the photograph was taken. The camera includes equipment that determines a physical position associated with an image. An application uses geographic data to determine a municipality, or other administrative or governmental area, in which the physical position is located and associates data indicating the municipality, or other administrative or governmental area, with the image.