Biochemical and mood responses predictive of stressful diving performance.

Measures of six self-reported moods (assessed using the Mood Questionnaire), serum cholesterol levels, and serum uric acid (SUA) levels were obtained from 26 divers attending the Saturation Diver Training (SDT) course, the most sophisticated and arduous diving course offered by the U.S. Navy. These measures were correlated with various types of diving activity that occurred during the seven years following graduation from the SDT course. Multiple regression analyses showed that two moods, Fear and Happiness, from the Mood Questionnaire, were independently related to years of subsequent diving experience, while mood Fear and cholesterol levels were associated with total number of dives made during this period. The number of dives made to depths of over 100 feet of sea water was related independently to cholesterol levels and mood Happiness. A high frequency of saturation diving (i.e., dives that last for periods in excess of 12 hours) was found for divers with high SUA levels and low scores on mood Fear. Variations in significant mood and biochemical measures across the different types of diving criteria are discussed in terms of the level of stress involved, prior diving experience, psychological traits including perceived control and achievement motivation, and attitudes formed toward diving during the SDT course.