Method: In a laboratory experiment, 39 participants did one of three stress-inducing tasks (a maths test, a Stroop test and public speaking). Their blood pressure and the extent to which the vessels around their heart contracted (low, medium or high myocardial ischaemia) was measured. Participants were instructed not to take any prescribed heart medication prior to the study.
Results: Participants with the greatest myocardial ischaemia showed the highest increases in blood pressure. A small number of participants who showed mild or no mycardial ischaemia only had a very moderate increase in blood pressure.
Conclusion: Stress may have a direct influence on aspects of body functioning, making cardiovascular disorders more likely.
Evaluation: Although the effects were clearly linked to stress, it can't be said that one causes the other. Also it wasn't shown whether the effects also occur at other times. They might sometimes happen even if the person feels relaxed - and therefore couldn't just be linked to feeling stressed. Not everybody showed the same reaction, which suggests that individual differences between the participants may have played a role. The ecological validity of the study was reduces because it took place under laboratory conditions that weren't fully representative.
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