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Acclimatization

While decompression sickness (DCS) is relatively rare, it receives much attention because its effects can be severe. Divers often find themselves completing multiple dives over a short period, such as on a dive vacation. A very natural concern is whether repeated, daily diving increases or decreases DCS risk. Adaptation to natural exposure is known as acclimatization. It is possible that repetitive diving could alter the degree of decompression stress experienced either through positive acclimatization (protective) or negative acclimatization (sensitizing and increasing the risk). Evidence of positive acclimatization to repetitive diving has been reported in a small number of animal studies, but data from the limited work with human subjects are less clear. Few divers will repeat the exact same dive profile or profiles on a daily basis. In practice, the first dives of a series, particularly following a period of not diving or upon arrival at an unfamiliar area, are often relatively conservative in comparison with later dives. This means that any change in the risk over the series may be due to factors other than the repetitive exposure, making it difficult to study the effect in observational studies. A greater degree of control is needed to gain insight. Our team recently completed a study of four days of identical, daily diving to remove the confounding variable of evolving dive profiles. We used intravascular bubbles as the indicator of decompression stress. The goal was to see if the postdive bubble grade scores changed over the series. This article summarizes the research fully described in the peer-reviewed paper. Read article online: http://www.alertdiver.com/Acclimatiza...