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The [W.sub.f] weighting and its associated formulation of motion dose, the Motion Sickness Dose Value (MSDV), are specifically intended for the evaluation of vertical motion.
The probability of illness increased substantially for lateral MSDVs above 16 [ms.sup.-1.5] (see Table 2).
The motion-sickness dosage value (MSDV) is measured as a time integral of the square of the frequency-weighted vertical acceleration.