Ceiling-controlled versus staged decompression: comparison between decompression duration and tissue tensions

Area of Science:

• Diving Physiology
• Decompression Theory

Background:

• The ceiling in decompression algorithms represents the maximum tolerated dissolved gas pressure.
• Staged decompression involves fixed depth intervals, while ceiling-controlled decompression follows a continuous ascent.
• Both methods aim to manage dissolved gas pressure during ascent from dives.

Purpose of the Study:

• To compare staged and ceiling-controlled decompression strategies.
• To analyze tissue gas supersaturation and decompression times.
• To evaluate the effectiveness of different decompression algorithms.

Main Methods:

• Mathematical simulations using the ZH-L16C algorithm and gradient factors.
• Analysis of various dive profiles.
• Comparison of inert gas washout and supersaturation patterns.

Main Results:

• Ceiling-controlled decompression maintained optimal gas washout gradients.
• Decompression times were 4-12% shorter with ceiling-controlled methods.
• Faster-half-time tissues experienced higher supersaturation with ceiling-controlled decompression.

Conclusions:

• Ceiling-controlled approaches offer faster decompression.
• The impact of accelerated decompression on decompression sickness risk remains undetermined.