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Physiological variables that can be estimated using NIN.
| Chemical measurements | Physiological variables | Temporal variables |
|---|---|---|
| Oxy-hemoglobin concentration | Blood volume | Heart rate |
| Deoxy-hemoglobin concentration | Blood flow | Respiration rate |
| Total hemoglobin concentration | Oxygen saturation | Mayer waves |
| Water concentration | CMRO2 | Low-frequency oscillations |
| Cytochrome oxidase concentration | Neural activity | |
| pH |
