Posture modifies pain tolerance

Can standing erect and adopting a powerful pose increase a person's pain tolerance?

This is the question Scott Wiltermuth and Vanessa K. Bohns set out to answer in their study "It Hurts When I Do This (or You Do That)" published in the Journal of Experimental Social Psychology.
And they found out that it does indeed.
Wiltermuth and Bohns had two hypothesis: The first was that people who were made to pose in positions that express dominance would have increased pain thresholds while those who adopted submissive postures would have decreased pain threshold. The second hypothesis was that when the subjects would be made to interact with dominant or submissive people, they would adopt the postures that would complement the behavior of the person they were interacting with, and their pain thresholds would be affected accordingly.
The research involved 44 female and 45 male participants. To test the first hypothesis, yoga poses were used. For the second, the interaction partners varied their body positions, the volume of their voices, and the space between themselves and the subject to present either a dominant or submissive persona. Pain threshold for both experiments was measured using a blood pressure cuff which was tightened until the subject said “stop.” For the interaction experiment, handgrip strength was also measured.
Results were positive for both hypothesis. That is, as stated in the report's abstract “participants who adopted dominant poses displayed higher pain thresholds than those who adopted submissive or neutral poses,” and “participants who interacted with a submissive confederate displayed higher pain thresholds and greater handgrip strength than participants who interacted with a dominant confederate.”
The results are important because of their implications for pain management. From the first experiment it is clear that the simple act of adopting dominant poses can increase pain tolerance. On the other hand, the second experiment has lessons for interactions between patients with pain and their caregivers, including doctors, nurses and family members. It appears that the people who care for patients in pain must make an effort to become more submissive and let the patient become the dominant person in their interactions.
Scott Wiltermuth is an assistant professor of management organization at the University of Southern California Marshall School of Business, and Vanessa K. Bohns is a postdoctoral fellow at the J.L. Rotman School of Management at the University of Toronto.