Comparison of Morning with Afternoon Nitrogen Elimination in Resting Subjects Breathing 100% Oxygen

摘要

The purpose of this study was to compare morning with afternoon nitrogen elimination rates in subjects breathing 100% oxygen. Less nitrogen elimination during the morning could possibly account for the higher incidence of altitude-induced decompression sickness reported during the morning. No difference was noted between the volume of nitrogen eliminated in the morning or afternoon sessions. However, significant correlations were noted between nitrogen elimination and physiological parameters associated with stress (e.g., increased heart rate and increased carbon dioxide elimination) implying that psychological and metabolic factors may influence the rate of nitrogen elimination. These data suggest that there is no diurnal variation in the effectiveness of breathing 100% oxygen as a means of denitrogenation. The increased incidence of DCS during the morning hours must therefore be due to other factors. Theses.