I was astonished at the claim that pilots ejecting can lose half an inch of height due to spinal compression induced by the G-forces. Claims seem to be borne out:
They were well known in fighter pilot community. It's not an obscure fact, they undergo training for ejection seats. There is a specific ejection posture to minimize the risk of snapping your spine.
https://www.forcesnews.com/news/can-ejecting-aircraft-make-p... https://www.quora.com/Do-pilots-lose-height-when-they-eject-...