["Late" obstruction induced by physical exertion in 15 boys with asthma caused by food aeroallergens in 2 periods of the year (winter and summer)].

The aim of this study was the observation of the presence of the "late" phase of obstruction after free run in subjects responsive either to aeoallergens either to food allergens but with withdrawal of food allergens from diet in comparison with control group of children which did not have the food allergens exclusion. The study was executed in February and in June in the same children's group having the purpose to observe the variation of this phase in June with a great pollination of graminacee. The results showed the presence of a late phase of obstruction of magnitude similar to the quick phase which begun from III to VII h. but was no greater than -20% FEV1 fall. The control group showed in many children the fall of -20% FEV1 fall. The group of children responsive to the graminacee with food allergen's exclusion showed in June a greater obstructive late phase in comparison to February but the obstruction never was greater than -20% FEV1 fall.