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The root mean square (RMS) of total acceleration and subjective feeling of the human’s body.
| The RMS of the total acceleration aω(m/s2) | Subjective feeling |
| 0.315 | Not uncomfortable |
| 0.315 0.63 | A little uncomfortable |
| 0.5 1.0 | Fairly uncomfortable |
| 0.8 1.6 | Uncomfortable |
| 1.25 2.5 | Very uncomfortable |
| >2.0 | Extremely uncomfortable |
