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Right Kind of Smile May Reduce Stress

By Senior News Editor
Reviewed by John M. Grohol, Psy.D. on July 30, 2012

Right Kind of Smile May Reduce StressResearchers have determined that the adage “just grin and bear it,” may be good advice in difficult situations.

In the study, doctoral student Tara Kraft and Sarah Pressman, Ph.D., of the University of Kansas investigated the potential benefits of smiling as related to our ability to recover from stress.

For the investigation they reviewed how different types of smiling, and the awareness of smiling, could affect an individuals’ ability to recover from episodes of stress.

The study is forthcoming in the journal Psychological Science.

“We wanted to examine whether these adages had scientific merit; whether smiling could have real health-relevant benefits,” Kraft said.

Smiles are usually divided into two categories: standard smiles, which use the muscles surrounding the mouth, and genuine or Duchenne smiles, which engage the muscles surrounding both the mouth and eyes.

Previous research shows that positive emotions can help during times of stress and that smiling can affect emotion; however, the work of Kraft and Pressman is the first of its kind to experimentally manipulate the types of smiles people make in order to examine the effects of smiling on stress.

For the study, researchers recruited 169 participants from a Midwestern university.

The experiment involved two phases: training and testing. During the training phase, participants were divided into three groups, and each group was trained to hold a different facial expression.

Participants were instructed to hold chopsticks in their mouths in such a way that they engaged facial muscles used to create a neutral facial expression, a standard smile, or a Duchenne smile.

Chopsticks were essential to the task because they forced people to smile without them being aware that they were doing so: only half of the group members were actually instructed to smile.

In the testing phase, participants were asked to work on multitasking activities. However, the participants didn’t know that the multitasking activities were designed to be stressful.

The first stress-inducing activity required the participants to trace a star with their non-dominant hand by looking at a reflection of the star in a mirror. The second stress-inducing activity required participants to submerge a hand in ice water.

During both of the stressful tasks, participants held the chopsticks in their mouth just as they were taught in training. The researchers measured participants’ heart rates and self-reported stress levels throughout the testing phase.

Researchers found that compared to participants who held neutral facial expressions, participants who were instructed to smile, and in particular those with Duchenne smiles, had lower heart rate levels after recovery from the stressful activities.

The participants who held chopsticks in a manner that forced them to smile, but were not explicitly told to smile as part of the training, also reported a smaller decrease in positive affect compared to those who held neutral facial expressions.

Overall researchers believe the findings show that smiling during brief stressors can help to reduce the intensity of the body’s stress response, regardless of whether a person actually feels happy.

“The next time you are stuck in traffic or are experiencing some other type of stress,” said Pressman, “you might try to hold your face in a smile for a moment.

“Not only will it help you ‘grin and bear it’ psychologically, but it might actually help your heart health as well!”

Source: Association for Psychological Science

Smiling man photo by shutterstock.

 

APA Reference
Nauert, R. (2012). Right Kind of Smile May Reduce Stress. Psych Central. Retrieved on September 2, 2014, from http://psychcentral.com/news/2012/07/31/right-kind-of-smile-may-reduce-stress/42426.html