What critical biological challenge led the Soviet space program to heavily feature Whole Body Vibration (WBV) research in the 1960s?

Answer

Rapid muscle atrophy and significant bone density loss caused by prolonged weightlessness

The most significant factor transforming vibration therapy into a serious modern modality was the research driven by the Space Race in the 1960s, specifically within the Soviet space program. Astronauts faced the severe biological consequence of extended periods in weightlessness, leading to rapid deterioration of musculoskeletal health, characterized by muscle atrophy and substantial loss of bone mineral density. To develop countermeasures capable of preserving astronaut integrity without requiring exhaustive physical exertion, the Soviets pioneered high-frequency, low-amplitude WBV training systems designed to induce rapid muscle contraction and relaxation.

What critical biological challenge led the Soviet space program to heavily feature Whole Body Vibration (WBV) research in the 1960s?
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