In the present study there was a significant decrease in
PEFR in diabetic subjects which is similar to other studies
[21,22]. This may be related to the poor mechanical properties
of the lung, like lung compliance and elastic recoil of lungs. In
addition, myopathic or neuropathic changes and alterations in
the bronchial reactivity affect respiratory muscles further
which impairs the endurance and efficiency of ventilatory
pump [23].