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Frequency domains (Note the omission of region I, relating to cardiac activity, as the frequency of an oscillator can not be modulated by itself or anything of higher frequency)
| Frequency band (Hz) | Related Activity | |
|---|---|---|
| II | 0.145 - 0.6 | Respiration |
| III | 0.052 - 0.145 | Myogenic |
| IV | 0.021 - 0.052 | Neurogenic |
| V | 0.0095-0.021 | Endothelial |
