Scottish scientists plan to investigate why firefighters are more at risk from heart attacks than any other emergency service workers.
Statistics have shown that despite undergoing regular health and fitness checks, members of fire crews are more prone to suffer cardiac arrests - which kill thousands of Scots every year - than any other branch of the emergency services.
A heart attack is the leading cause of death for on-duty firefighters, and they also tend to suffer cardiac arrest at a younger age than the general population.
The British Heart Foundation (BHF) has provided GBP187,000 to support the new study, which will see academics from Edinburgh University monitor 50 firefighters over a two-year period. Researchers will follow them during fire training - where they tackle blazes at up to 700C - to work out the effect their job has on the heart.
A heart attack occurs when one of the coronary arteries supplying blood to the heart muscle becomes blocked, while a cardiac arrest is when a person's heart stops pumping blood round the body, and they stop breathing normally.
Many cardiac arrests in adults happen because the person is having a heart attack.
Dr Nick Mills, the consultant cardiologist leading the research at Edinburgh Royal Infirmary, said: "The risk of having a heart attack whilst you're in service as a firefighter is highest during fire suppression activity, compared to any other emergency activity.
"A cigarette smoker might have a two-fold risk of having a heart attack - but there's a 30-fold increased risk of having a heart attack during fire suppression activity."
A previous study in America has even put the risk of death from heart attack for firefighters when battling a blaze at up to 100 times the normal rate.
The US research also showed that though firefighters spend only 1 to 5 per cent of their time putting out fires, 32 per cent of deaths from heart attacks occurred at fire scenes.
Though the reason for the increased risk is not fully understood, experts suspect that it may be connected to a combination of the heat and the different stresses placed on the body when fighting a fire.
Dr Hélène Wilson, research advisor at the BHF, said that toxins and smoke given off from fires were contributing factors.
"We can't be sure exactly what the effects of air pollution are on the heart, particularly at the low levels we find in most UK cities.
"But there is convincing evidence that even low levels of air pollution might be bad for the heart. At higher levels - like those faced by firefighters, for example, or in developing cities like Beijing - pollutants are likely to have a more serious and long-lasting effect.
"This project will help bring us closer to working out the reasons why pollutants can have such a harmful effect on heart health."
One of those who agreed to take part is watch commander Stevie Young of Lothian and Borders Fire and Rescue Service.
Mr Young, 48, said: "My father passed away in his 50s with heart trouble and he started getting heart trouble in his 40s.
"I'm 48 now so I think it's beneficial to find out especially with the job I'm in."
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