Table 2.
List of the quantitative parameters obtained from the PPG and CHb signals
| Parameter | Description |
|---|---|
| Min | Minimum PPG amplitude or CHb value recorded during the occlusion phase (AU) |
| tmin | Time to min—time from the beginning of the occlusion to the minimum skin blood flow during the occlusion phase (s) |
| Peak | Maximum PPG amplitude or CHb value recorded in the first seconds of the hyperemic phase (AU) |
| tpeak | Time to peak—time from the end of the occlusion phase to the maximum PPG amplitude or CHb value recorded in the first seconds of the hyperemic phase (s) |
| Max | Maximum PPG amplitude or CHb value recorded during the entire hyperemic phase (AU) |
| tmax | Time-to-max—time from the end of the occlusion phase to the absolute maximum value (s) |
| dV | Decrement velocity— average rate of decrease of the PPG or CHb value (between 5 and 8 min) (AU/min) |
| iV | Increment velocity— average rate of increase of the PPG or CHb value (between 8 min and time at peak value) (AU/min) |