P A study done by Kiecolt-Glaser et al. looks at the effect of short term stressors on immunse system functioning in medical students.
E Blood samples were taken one month before (low stress) and during the exam period itself (high stress). They measured NK cell activity in the blood sample tp assess immune system functioning. They found that NK cell activity was signicficantly reduced in the second sample.
C This shows that short term predictable stressors reduce immune system functioning.
AO3: However the study had low population validity as there was only one age group involved i.e. students. This means that we can't generalise the reslts of the study to the whole population.
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