Factual error: In the scene with the "lunar roll" (where both shuttles Freedom and Independence are being sling-shot around the moon), they are said to be experiencing "9 and a half G's for 11 minutes". But during this time, the crew members are screaming at the top of their lungs at each other. Under that much pressure it would be nearly impossible to breathe, let alone scream. Even if they're wearing G-suits, with the helmets off, they would be directly exposed to the pressure. (01:18:50)
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Suggested correction: Common misconception on the effects of high G on the body. The reason why we see pilots in videos struggling to breath is not the high G, but the breathing technique they use to fight off the blood pressure drop and avoid G-loc. High G only effects are pulling the face down, making the head extremely heavy, and eventually loss of consciousness (G-loc). Also, any mention of pressure is irrelevant, as acceleration (high G) and pressure are two completely unrelated topics.
It sounds like you're saying without proper breathing techniques, they would have experienced "G-loc." So if the crew is talking/yelling and not properly breathing, they should have experienced "G-loc." And I don't know who taught you math and science, but Pressure = Force/Area. And Force = Mass x Acceleration. So pressure is 100% related to acceleration and G's.
Bishop73