“While shaking hands for longer may appear to be a warm gesture on the surface, we found that they negatively affected the behaviour of the recipient, even after the handshake was finished.
“Politicians are particularly keen on prolonged handshakes, which are often used an expression of warmth but also as a means of demonstrating authority.
“However, our findings suggest that while doing so might look impressive for the cameras, this behaviour could potentially jeopardise the quality of their working and personal relationships from the beginning, which could have repercussions for millions of people.”
The results can be found in the Perceptual And Motor Skills journal, Effects Of Handshake Duration On Other Nonverbal Behavior.
Previously in 2011 Dr Nagy analysed hugs and what they say about shared experiences.