Fitness fanatics 'have high sex drives'
Fitness fanatics really do havbhavane higher sex drives, according to scientists who say they have identified a link between exercise and personality.
They also tend to be more aggressive and socially dominant said Dr Peter Biro, an Australian academic.
He said their findings, which came from studying the relationship between behaviour and metabolic rate in a number of insects, birds and animals, gave weight to the popular stereotype of the athletic "jock" and the awkward "nerd".
Dr Biro said there was enough evidence from numerous studies to suggest that those that had a higher metabolism, and thus tended to exercise more, appeared to exhibit particular behaviour traits that often included a higher sex drive.
"Some of us are couch potatoes while others are drawn to sport and exercise," he said.
"We often associate the athletic 'jock' type or person with being aggressive and social, whereas the more sedentary 'nerd' often is seen as more socially awkward and submissive.
"These are generalisations, but most people would probably agree there is some truth to them."
Dr Biro, a senior lecturer at the University of New South Wales's Evolution and Ecology Research Centre, has written on the subject with Judy Stamps of the University of California, Davis, in a review article in the journal Trends in Ecology and Evolution.
The article concludes that there is now enough evidence to suggest a link between personality and the rate of metabolism – the chemical process that converts food into the energy that fuels the body.
He explained: "Animals in captivity often engage in energetically demanding behaviour when they have unlimited food available.
"Mice spend considerable time on running wheels, for example, and other animals often pace back and forth in zoo enclosures. Given they don't need to move about in search of food as they would in nature, we might ask why they are apparently 'exercising.'
"Recent research suggests that this behaviour might be related to an individual's capacity to generate energy - its 'metabolic capacity'."
He continued: "Male crickets with sex on their mind tend to call to attract mates more and have higher metabolism than those with slower metabolism.
Metabolism and aggression are also linked. For example, it has been shown that in several species of fish and birds, individuals with high metabolism tend to be more aggressive and dominant over those with slow metabolism.
Chris Jones, head of physiology at Nuffield Health, said although there was no evidence of a direct link between exercise and sex drive, there was a link between doing regular exercise and levels of testosterone and adrenalin.
"There is evidence that enhanced testosterone and adrenalin in men and women does enhance libido."
He added: "What's particularly interesting is that exercise also seems to have an effect on stopping the problems that lead to a decrease in libido."
Sapan Sehgal, 27, an instructor at London Fields Fitness Studios, agreed there was a link between exercise and sex drive.
"If you exercise regularly you are fitter, healthier and have more confidence to approach the opposite sex," he said.
"Your hormone levels are also increased."
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