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" ... Prior to the task, researchers randomly assigned study participants to one of three groups: those who had their partner present, those who were told to think about their partner, and those who were told to think about their day during the stressor. Researchers found that participants in both the partner present and mental activation conditions had significantly lower blood pressure response during the cold pressor task compared to control participants for both systolic and diastolic blood pressure, though no significant differences emerged for heart rate. ... "
" ... The researchers designed a second study to test whether their hypothesis would hold up using a different pain task. In this study, participants were asked to engage in a “cold pressor” exercise — a pain test in which people dip one of their hands into freezing cold water for as long as they can tolerate. The researchers led participants to believe that they were engaging in the cold pressor exercise as a mandatory part of the experiment or as an optional exercise that would benefit the scientific community. They found that participants who volunteered for cold pressor exercise perceived less pain during the task and held their hand in the water longer than participants who were led to believe that the cold pressor test was a mandatory part of the experiment. ... "