Effects of Vibration: Embryonic Development & Maturity, USA Army Aeromedical Research

Effect of Vibration Frequency and Amplitude on Developing Chicken Embryos
Samuel Shannon, Al Moran, Linda Shackelford, Kevin Mason – Aircrew Protection Division, 1994

Controlling for the amplitude transmission, we found very strong effects of vibration on embryonic development and mortality. …Until further laboratory and epidemiological studies of this potential health hazard on animal and human pregnancy outcomes are completed, pregnant Army aviators should not fly in rotary-wing aircraft. We believe the vibratory aspect of the rotary-wing aircraft environment is a fetal health hazard.”

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