The serious business of laughter

Prisoners in a Bombay jail take part in a therapeutic "laughter session". Picture / Reuters

Question: what's studied by philosophers, psychologists, psychiatrists, anthropologists, physiologists, neurologists and linguists, affects everybody, and is one of the most complex and least understood behaviours known to man?

Answer: Laughter.

You might think the subject of laughter is simple - someone tells a joke, if it's funny, you laugh - but really, laughter is one of the few remaining great unknowns of human behaviour. Gelotology (the physiological study of laughter) is one of the least studied fields of science and in New Zealand and Australia there is not one registered gelotologist.

Part of the reason gelotology is such an obscure field is because, for years, researchers couldn't agree on a common definition of humour. The subject of laughter was also regarded by many as frivolous and unworthy of substantial analysis.

However, in recent years, European and American researchers have made significant headway into understanding the phenomenon and, as it turns out, may well get the last laugh.

If you've ever laughed so hard it hurt, it could mean you're unfit. Up to 80 muscles are used during a hearty laugh, the blood pressure rises, the heart beats faster and blood oxygen levels increase.

In fact, a study released last year by German gelotologist Professor Gunther Sickl revealed that a one-minute guffaw has the same health benefits as a 45-minute gym workout. When the laughter stops, the blood pressure returns to normal and stress hormones are reduced - actually strengthening the immune system.

Other researchers have also found evidence that laughter really may be the best medicine. Laughter increases the production of Gamma-interferon (an antiviral protein) T-cells, which are key to immune response, and B-cells, which generate antibodies and help keep nasties at bay.

They also found that when laughter induces hiccupping or coughing, it helps to clear the respiratory tract by dislodging all kinds of gross stuff and increases the concentration of salivary immunoglobulin A, which helps kill any sickly bugs you may have inhaled.

It is not just the physical health benefits of laughter that have piqued researchers' interest though. Barbara Plester of Massey University's management and international business department has spent several years studying the effects of humour in the workplace and authored the paper, Taking the piss: Using banter at work.

Plester, who is one of only four New Zealand members of the International Society of Humour Studies (yes, there really is such a thing), says humour is multi-functioned. Plester has dedicated her masters and doctorate research to the study of workplace humour and believes it is one of the most fascinating, but complex, subjects around.