Pulse oximetry is a non-invasive method used to measure the oxygen saturation level of a person's blood. This technique employs a small device, typically clipped to a fingertip or earlobe, which uses light wavelengths to estimate the amount of oxygen bound to hemoglobin in the blood. It's particularly significant during exercise at altitude, where oxygen availability is reduced, allowing for real-time monitoring of how well the body is adapting to lower oxygen levels.
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