“Obesity can worsen the impact of asthma and may also mask its severity in standard tests, according to researchers in New Zealand, who studied lung function in asthmatic women with a range of body mass indexes (BMIs). With increasing BMI, FRC (functional residual capacity) was higher, whereas IC (inspiratory capacity) was significantly decreased. ‘This means that among women with greater BMI, an asthma-like episode has the potential to cause greater breathing difficulties than in non-obese women,’ said Dr. Taylor.’”
http://www.sciencedaily.com/releases/2008/05/080501062743.htm
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