Asthma causes

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br/>As we come close to the Beijing Olympic Games, a review article in CMAJ (Canadian Medical Association Journal) reminds us that the heat and humidity in the Beijing region will present a formidable challenge to all athletes. Moreover, poor quality of air can also affect all athletes, especially those with asthma.
'With exposure to an environment that has poor quality, air pollutants may trigger symptoms of asthma in a dose-dependent manner,' say Donald McKenzie and Louis-Philippe Boulet. 'With the high minute ventilation (amount of air breathed in one minute) seen during exercise, the effects of exposure to these pollutants are more noticeable in athletes than in non-athletes and likely more evident in people with asthma than in those without asthma.'
Physical activity and regular exercise can improve the control of asthma and is recommended to patients. However, there is mounting evidence that frequent, intense exercise by highly trained athletes could itself contribute to the development of asthma

These were the key findings of research carried out by researchers in New Zealand, and published in this month's edition of Clinical and Experimental Allergy. This work built on the fact that the prevalence both of asthma and the use of antibiotics have risen since the 1960s. Using antibiotics reduces a person's exposure to bacterial infections and disturbs healthy populations of bacteria in the body, and the question is whether this then leaves a person more prone to develop asthma.
The researchers recruited a group of 1,000 babies at birth and contacted the parents at 3 months, 15 months and then yearly until they were four years old. Each time, they collected data about chest infections, asthma and their use of antibiotics. The data showed that by the time the children had reached 15 months old, nearly three quarters (72.1%) had been given antibiotics. In addition 11.8% had asthma, 39.6% had eczema and 21.2% had a recurring itchy scaly rash

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