What happens to the risk of DCS as ascent duration increases?

As the duration of ascent increases, the risk of decompression sickness (DCS) typically increases. This is primarily because a longer ascent allows for more time for nitrogen, which has been absorbed by the body during increased pressures, to form bubbles within the tissues and bloodstream when pressure decreases.

During a rapid ascent, the body's ability to eliminate nitrogen can become overwhelmed, leading to the formation of bubbles that cause DCS. Conversely, a slow and controlled ascent provides more time for the body to off-gas the nitrogen safely, which reduces the risk of DCS. Therefore, extending the duration of ascent without appropriate controls can lead to heightened risk as it allows for more potential nitrogen absorption and bubble formation upon pressure reduction.

This increase in risk with longer ascent times is a key consideration for individuals engaging in activities such as diving or high-altitude flying, where managing ascent rates is crucial for safety and health.