HANDSHAKES lasting longer than three seconds can trigger anxiety, a study found.
They could also jeopardise relationships between world leaders and business chiefs, experts say.
Researchers quizzed subjects about career prospects before introducing them to a person who would either shake their hand “normally” (under three seconds), for a prolonged period or not at all.
The participants were unaware of the significance, and their reactions analysed.
The team found participants laughed less and showed increased anxiety after a longer handshake.
The no-handshake experiment resulted in no behavioural changes.
Study lead Dr Emese Nagy, of the University of Dundee, said: “Three-second handshakes feel more natural.
“Shaking hands for longer may appear a warm gesture on the surface, but we found it negatively affected the recipient’s behaviour.
“Politicians are particularly keen on prolonged handshakes, which are often used an expression of warmth but also as a means of demonstrating authority.
“They might look good for the cameras but this behaviour could jeopardise the quality of working and personal relationships, which could have repercussions for millions of people.”
France’s Emmanuel Macron and US President Donald Trump shared an awkward 29-second handshake at Bastille Day in Paris in 2017.
In 2011 Dr Nagy analysed hugs and what they say about shared experiences.