The effect on speech intelligibility was measured for speech where talkers reading Diagnostic Rhyme Test material were exposed to 0.7 g whole body vibration to simulate space vehicle launch. Across all talkers, the effect of vibration was to degrade the percentage of correctly transcribed words from 83% to 74%. The magnitude of the effect of vibration on speech communication varies between individuals, for both talkers and listeners. A "worst case" scenario for intelligibility would be the most "sensitive" listener hearing the most "sensitive" talker; one participant's intelligibility was reduced by 26% (97% to 71%) for one of the talkers.
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