Human Sex Differences in Extreme Isolation

Abstract

This report compares the responses of male and female adult subjects in the water-immersion sensory-isolation environment. Endurance, subjective time estimates, and heart rate were dependent variables. Duration under water, with voluntary termination possible, was an average of about 4 hr. for both males and females. Subjective estimate of total time in isolation averaged about 3 ½ hr. for females and almost 4 hr. for males. Subjective time estimate of consecutive 30-min. time intervals was a bit more than 30 min. for males and about 33 min. for females. Mean heart rate (beats/minute) averaged in the 80s for both groups. None of these differences is statistically significant. This study clarifies the mixed findings reported in the literature as to sex differences in isolated environments.