For hypobaric exposure, what is the downtime after runs greater than 25,000 feet?

For hypobaric exposure, what is the downtime after runs greater than 25,000 feet?

• A. No restriction
• B. 24 hours
• C. 48 hours
• D. 72 hours

Answer: (B)

When you spend time in a hypobaric environment, the reduced pressure causes inert gas (mainly nitrogen) to dissolve into body tissues. If you jump back into another high-altitude or hypobaric exposure too soon, those dissolved gases can come out of solution and form bubbles, leading to decompression sickness or related symptoms. Allowing a downtime after a run above 25,000 feet lets the tissues off-gas and the body's gas tensions return toward baseline, reducing the risk on subsequent exposures. A 24-hour period is the standard minimum to achieve this balance. Longer downtimes aren’t typically required for routine cases, and no downtime would keep you at higher risk.

When you spend time in a hypobaric environment, the reduced pressure causes inert gas (mainly nitrogen) to dissolve into body tissues. If you jump back into another high-altitude or hypobaric exposure too soon, those dissolved gases can come out of solution and form bubbles, leading to decompression sickness or related symptoms. Allowing a downtime after a run above 25,000 feet lets the tissues off-gas and the body's gas tensions return toward baseline, reducing the risk on subsequent exposures. A 24-hour period is the standard minimum to achieve this balance. Longer downtimes aren’t typically required for routine cases, and no downtime would keep you at higher risk.