الفهرس 
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Abstract
This work was carried on 20 patients (18 non cigarette smokers and 2 cigarette smokers) with stable mild persistent asthma according to GINA classification.
Each patient underwent the following:
Full history taking, complete clinical examination, routine laboratory investigations, ECG and echocardiography if needed, chest X ray (postero-anterior), pulmonary function tests (using 200-400mg salbutamol, reversibility was diagnosed if FEV1 increased by ≥20% or≥200 ml from the pre bronchodilator level ) was done before ,during ,immediately after and 30 minutes after the cardiopulmonary exercise testing was done .
There was increase in VT, RR,VE and VT/TI during exercise that decreased 30 minutes after exercise while TI and Ttot decreased during exercise then decreased more immediately after exercise.
There was no significant difference in FVC, FEV1/FVC and FET100% before ,during, immediately after and after 30 minutes of exercise.
There was a significant decrease in FEV1,PEF and FEF25-75% 30 minutes after exercise.
There was positive correlation between VT and FVC, RR and FEV1/FVC, TI and FET100% and between VE and FEF25-75%.
There was positive correlation between both VO2 max and VCO2 with FET100% before exercise and with FVC during exercise.
There was positive correlation between FEV1with VCO2 30minutes after exercise.
These results emphasis on the impact of exercise on bronchial hyperresponsiveness in bronchial asthma and breathing pattern.
This is translated into a decrease in the quality of life and productivity for these individuals which urges a good rehabilitation programs for lifelong control of such a problem.