A study has discovered that a few-minute walk can significantly boost mood, states a media report. The researchers say their study is the first to show this by stripping away all the many factors associated with exercise - such as getting fresh air, being in nature and the satisfaction of reaching fitness goals.

Psychologists say the happiness-causing effects arise from the actual physical movement which is connected to how we evolved to move to find food and other rewards.

Essentially, 'movement not only causes increased positive affect [emotional feelings] … but movement partially embodies, or in a sense reflects, positive affect,' the study authors from Iowa State University wrote in the paper published in the journal Emotion.

Across three studies, the team tested hundreds of undergraduate students who were not aware of the true aims of the research to avoid biased answers. 

Two of the studies showed that students who spent 12 minutes on a group walking tour of campus buildings, or on a dull walking tour on their own of the interior of a campus building, reported more positive mood. 

This was compared to another group who sat and looked at photographs of the same campus tour or watched a video of the same building interior tour.

In a second study, positive mood effects were also found even when researchers induced 'dread' in the participants before their walk, by instructing them that after the walk they had to write a two-page essay afterwards.  

In the final study, students spent 10 minutes watching a Saatchi Gallery video alone, one, in three groups who were either sitting, standing or walking on a treadmill. 

Once again, at the end, the students who'd spent time walking reported more positive mood scores than those who had been sitting or standing.  

Authors Jeffrey Miller and Zlatan Krizan wrote: 'People may underestimate the extent to which just getting off their couch and going for a walk will benefit their mood as they focus on momentarily perceived barriers rather than eventual mood benefits.'