muscleoxygenmonitorr

At rest most people read between 65 % and 80 %. Start jogging and the number slowly falls as fibers consume more fuel. Sprint up a hill and the value can crash below 30 %, signalling an empty tank. When effort stops, oxygen rushes back and the percentage climbs. Because the reading happens right inside the muscle you choose, it reflects local workload far better than heart rate, which can lag or be skewed by stress, temperature, or caffeine.