Study of immunosuppression- Kiecolt-Glaser

Blood samples were taken from 75 first year medical students (49 male and 26 females), all of whom were volunteers. The samples were taken a month before their exams and on the first day of their exams (after 2 papers had been sat). The samples were then analysed for the amount of leucocyte activity, specifically for the amount of natural killer cell activity.

As predicted by the experimenters, the natural killer cell activity was greatly reduced…