The Hex determines zones based off of features present in the optical signal, which include the muscle oxygenation (SmO2), oxygenated hemoglobin concentration (HbO2), and de-oxygenated hemoglobin (Hb) concentration.
These zones are NOT found by assuming fixed SmO2 thresholds. Humon's algorithms analyze the balance between the oxygen supply and oxygen demand in the tissue and classify the state of the muscle as being in 1 of 4 zones:
- Steady state
- Approaching limit