Measured the cortisol levels in the
saliva of 94 sixth grade students
between the ages of 9-14.
Also filled out a questionnaire on their
experiences of being bullied or watching
someone being bullied, plus additional
measures of anxiety and trauma.
Cortisol levels were measured first
thing in the morning and just before
lunch time.
Their findings demonstrate the limitations of
the animal research carried out by Delville.
Bullying does appear to cause a
spike in cortisol levels.
But it appears that in humans who experience
long-term bullying - or the fear of witnessing
someone being bullied - have low levels of cortisol.
In other words a cortisol deficiency called hypocortisol.
This condition is linked to chronic fatigue
syndrome, chronic pain and post traumatic
stress disorder.