How does hypothermia increase the risk of decompression sickness?

Hypothermia increases the risk of decompression sickness due to the body's response to cold temperatures, which includes the constriction of blood vessels in the extremities. When the body cools, it prioritizes preserving core temperature by reducing blood flow to the arms, legs, and other peripheral areas. This constriction can lead to a higher concentration of nitrogen in the bloodstream as the body struggles to eliminate it during ascent from a dive, increasing the likelihood of bubbles forming in tissues and bloodstream, which is a hallmark of decompression sickness.

This physiological response affects how gases are absorbed and released from tissues. In warmer conditions, the body's metabolism and circulation are more efficient, allowing for better off-gassing of nitrogen. However, in a state of hypothermia, the effectiveness of these processes diminishes, creating a heightened risk for developing decompression sickness.

Understanding these dynamics is crucial for divers, as maintaining optimal body temperature not only supports comfort but also helps prevent serious diving-related complications.